Documentation / git.txton commit Merge branch 'mk/submodule-gitdir-path' into maint (1bf986b)
   1git(1)
   2======
   3
   4NAME
   5----
   6git - the stupid content tracker
   7
   8
   9SYNOPSIS
  10--------
  11[verse]
  12'git' [--version] [--help] [-C <path>] [-c <name>=<value>]
  13    [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
  14    [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
  15    [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
  16    <command> [<args>]
  17
  18DESCRIPTION
  19-----------
  20Git is a fast, scalable, distributed revision control system with an
  21unusually rich command set that provides both high-level operations
  22and full access to internals.
  23
  24See linkgit:gittutorial[7] to get started, then see
  25linkgit:giteveryday[7] for a useful minimum set of
  26commands.  The link:user-manual.html[Git User's Manual] has a more
  27in-depth introduction.
  28
  29After you mastered the basic concepts, you can come back to this
  30page to learn what commands Git offers.  You can learn more about
  31individual Git commands with "git help command".  linkgit:gitcli[7]
  32manual page gives you an overview of the command-line command syntax.
  33
  34Formatted and hyperlinked version of the latest Git documentation
  35can be viewed at `http://git-htmldocs.googlecode.com/git/git.html`.
  36
  37ifdef::stalenotes[]
  38[NOTE]
  39============
  40
  41You are reading the documentation for the latest (possibly
  42unreleased) version of Git, that is available from the 'master'
  43branch of the `git.git` repository.
  44Documentation for older releases are available here:
  45
  46* link:v2.6.2/git.html[documentation for release 2.6.2]
  47
  48* release notes for
  49  link:RelNotes/2.6.2.txt[2.6.2],
  50  link:RelNotes/2.6.1.txt[2.6.1],
  51  link:RelNotes/2.6.0.txt[2.6].
  52
  53* link:v2.5.4/git.html[documentation for release 2.5.4]
  54
  55* release notes for
  56  link:RelNotes/2.5.4.txt[2.5.4],
  57  link:RelNotes/2.5.3.txt[2.5.3],
  58  link:RelNotes/2.5.2.txt[2.5.2],
  59  link:RelNotes/2.5.1.txt[2.5.1],
  60  link:RelNotes/2.5.0.txt[2.5].
  61
  62* link:v2.4.10/git.html[documentation for release 2.4.10]
  63
  64* release notes for
  65  link:RelNotes/2.4.10.txt[2.4.10],
  66  link:RelNotes/2.4.9.txt[2.4.9],
  67  link:RelNotes/2.4.8.txt[2.4.8],
  68  link:RelNotes/2.4.7.txt[2.4.7],
  69  link:RelNotes/2.4.6.txt[2.4.6],
  70  link:RelNotes/2.4.5.txt[2.4.5],
  71  link:RelNotes/2.4.4.txt[2.4.4],
  72  link:RelNotes/2.4.3.txt[2.4.3],
  73  link:RelNotes/2.4.2.txt[2.4.2],
  74  link:RelNotes/2.4.1.txt[2.4.1],
  75  link:RelNotes/2.4.0.txt[2.4].
  76
  77* link:v2.3.10/git.html[documentation for release 2.3.10]
  78
  79* release notes for
  80  link:RelNotes/2.3.10.txt[2.3.10],
  81  link:RelNotes/2.3.9.txt[2.3.9],
  82  link:RelNotes/2.3.8.txt[2.3.8],
  83  link:RelNotes/2.3.7.txt[2.3.7],
  84  link:RelNotes/2.3.6.txt[2.3.6],
  85  link:RelNotes/2.3.5.txt[2.3.5],
  86  link:RelNotes/2.3.4.txt[2.3.4],
  87  link:RelNotes/2.3.3.txt[2.3.3],
  88  link:RelNotes/2.3.2.txt[2.3.2],
  89  link:RelNotes/2.3.1.txt[2.3.1],
  90  link:RelNotes/2.3.0.txt[2.3].
  91
  92* link:v2.2.3/git.html[documentation for release 2.2.3]
  93
  94* release notes for
  95  link:RelNotes/2.2.3.txt[2.2.3],
  96  link:RelNotes/2.2.2.txt[2.2.2],
  97  link:RelNotes/2.2.1.txt[2.2.1],
  98  link:RelNotes/2.2.0.txt[2.2].
  99
 100* link:v2.1.4/git.html[documentation for release 2.1.4]
 101
 102* release notes for
 103  link:RelNotes/2.1.4.txt[2.1.4],
 104  link:RelNotes/2.1.3.txt[2.1.3],
 105  link:RelNotes/2.1.2.txt[2.1.2],
 106  link:RelNotes/2.1.1.txt[2.1.1],
 107  link:RelNotes/2.1.0.txt[2.1].
 108
 109* link:v2.0.5/git.html[documentation for release 2.0.5]
 110
 111* release notes for
 112  link:RelNotes/2.0.5.txt[2.0.5],
 113  link:RelNotes/2.0.4.txt[2.0.4],
 114  link:RelNotes/2.0.3.txt[2.0.3],
 115  link:RelNotes/2.0.2.txt[2.0.2],
 116  link:RelNotes/2.0.1.txt[2.0.1],
 117  link:RelNotes/2.0.0.txt[2.0.0].
 118
 119* link:v1.9.5/git.html[documentation for release 1.9.5]
 120
 121* release notes for
 122  link:RelNotes/1.9.5.txt[1.9.5],
 123  link:RelNotes/1.9.4.txt[1.9.4],
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 126  link:RelNotes/1.9.1.txt[1.9.1],
 127  link:RelNotes/1.9.0.txt[1.9.0].
 128
 129* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
 130
 131* release notes for
 132  link:RelNotes/1.8.5.6.txt[1.8.5.6],
 133  link:RelNotes/1.8.5.5.txt[1.8.5.5],
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 136  link:RelNotes/1.8.5.2.txt[1.8.5.2],
 137  link:RelNotes/1.8.5.1.txt[1.8.5.1],
 138  link:RelNotes/1.8.5.txt[1.8.5].
 139
 140* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
 141
 142* release notes for
 143  link:RelNotes/1.8.4.5.txt[1.8.4.5],
 144  link:RelNotes/1.8.4.4.txt[1.8.4.4],
 145  link:RelNotes/1.8.4.3.txt[1.8.4.3],
 146  link:RelNotes/1.8.4.2.txt[1.8.4.2],
 147  link:RelNotes/1.8.4.1.txt[1.8.4.1],
 148  link:RelNotes/1.8.4.txt[1.8.4].
 149
 150* link:v1.8.3.4/git.html[documentation for release 1.8.3.4]
 151
 152* release notes for
 153  link:RelNotes/1.8.3.4.txt[1.8.3.4],
 154  link:RelNotes/1.8.3.3.txt[1.8.3.3],
 155  link:RelNotes/1.8.3.2.txt[1.8.3.2],
 156  link:RelNotes/1.8.3.1.txt[1.8.3.1],
 157  link:RelNotes/1.8.3.txt[1.8.3].
 158
 159* link:v1.8.2.3/git.html[documentation for release 1.8.2.3]
 160
 161* release notes for
 162  link:RelNotes/1.8.2.3.txt[1.8.2.3],
 163  link:RelNotes/1.8.2.2.txt[1.8.2.2],
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 165  link:RelNotes/1.8.2.txt[1.8.2].
 166
 167* link:v1.8.1.6/git.html[documentation for release 1.8.1.6]
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 176  link:RelNotes/1.8.1.txt[1.8.1].
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 178* link:v1.8.0.3/git.html[documentation for release 1.8.0.3]
 179
 180* release notes for
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 182  link:RelNotes/1.8.0.2.txt[1.8.0.2],
 183  link:RelNotes/1.8.0.1.txt[1.8.0.1],
 184  link:RelNotes/1.8.0.txt[1.8.0].
 185
 186* link:v1.7.12.4/git.html[documentation for release 1.7.12.4]
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 188* release notes for
 189  link:RelNotes/1.7.12.4.txt[1.7.12.4],
 190  link:RelNotes/1.7.12.3.txt[1.7.12.3],
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 193  link:RelNotes/1.7.12.txt[1.7.12].
 194
 195* link:v1.7.11.7/git.html[documentation for release 1.7.11.7]
 196
 197* release notes for
 198  link:RelNotes/1.7.11.7.txt[1.7.11.7],
 199  link:RelNotes/1.7.11.6.txt[1.7.11.6],
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 205  link:RelNotes/1.7.11.txt[1.7.11].
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 207* link:v1.7.10.5/git.html[documentation for release 1.7.10.5]
 208
 209* release notes for
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 215  link:RelNotes/1.7.10.txt[1.7.10].
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 217* link:v1.7.9.7/git.html[documentation for release 1.7.9.7]
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 229* link:v1.7.8.6/git.html[documentation for release 1.7.8.6]
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 240* link:v1.7.7.7/git.html[documentation for release 1.7.7.7]
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 250  link:RelNotes/1.7.7.txt[1.7.7].
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 252* link:v1.7.6.6/git.html[documentation for release 1.7.6.6]
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 255  link:RelNotes/1.7.6.6.txt[1.7.6.6],
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 263* link:v1.7.5.4/git.html[documentation for release 1.7.5.4]
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 272* link:v1.7.4.5/git.html[documentation for release 1.7.4.5]
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 282* link:v1.7.3.5/git.html[documentation for release 1.7.3.5]
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 284* release notes for
 285  link:RelNotes/1.7.3.5.txt[1.7.3.5],
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 290  link:RelNotes/1.7.3.txt[1.7.3].
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 292* link:v1.7.2.5/git.html[documentation for release 1.7.2.5]
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 302* link:v1.7.1.4/git.html[documentation for release 1.7.1.4]
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 311* link:v1.7.0.9/git.html[documentation for release 1.7.0.9]
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 325* link:v1.6.6.3/git.html[documentation for release 1.6.6.3]
 326
 327* release notes for
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 333* link:v1.6.5.9/git.html[documentation for release 1.6.5.9]
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 347* link:v1.6.4.5/git.html[documentation for release 1.6.4.5]
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 357* link:v1.6.3.4/git.html[documentation for release 1.6.3.4]
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 374* link:v1.6.1.3/git.html[documentation for release 1.6.1.3]
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 404* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
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 415* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
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 425  link:RelNotes/1.5.4.txt[1.5.4].
 426
 427* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 428
 429* release notes for
 430  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 431  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 432  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 433  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 434  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 435  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 436  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 437  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 438  link:RelNotes/1.5.3.txt[1.5.3].
 439
 440* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 441
 442* release notes for
 443  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 444  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 445  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 446  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 447  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 448  link:RelNotes/1.5.2.txt[1.5.2].
 449
 450* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 451
 452* release notes for
 453  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 454  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 455  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 456  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 457  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 458  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 459  link:RelNotes/1.5.1.txt[1.5.1].
 460
 461* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 462
 463* release notes for
 464  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 465  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 466  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 467  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 468  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 469  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 470  link:RelNotes/1.5.0.txt[1.5.0].
 471
 472* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 473  link:v1.3.3/git.html[1.3.3],
 474  link:v1.2.6/git.html[1.2.6],
 475  link:v1.0.13/git.html[1.0.13].
 476
 477============
 478
 479endif::stalenotes[]
 480
 481OPTIONS
 482-------
 483--version::
 484        Prints the Git suite version that the 'git' program came from.
 485
 486--help::
 487        Prints the synopsis and a list of the most commonly used
 488        commands. If the option '--all' or '-a' is given then all
 489        available commands are printed. If a Git command is named this
 490        option will bring up the manual page for that command.
 491+
 492Other options are available to control how the manual page is
 493displayed. See linkgit:git-help[1] for more information,
 494because `git --help ...` is converted internally into `git
 495help ...`.
 496
 497-C <path>::
 498        Run as if git was started in '<path>' instead of the current working
 499        directory.  When multiple `-C` options are given, each subsequent
 500        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 501        <path>`.
 502+
 503This option affects options that expect path name like `--git-dir` and
 504`--work-tree` in that their interpretations of the path names would be
 505made relative to the working directory caused by the `-C` option. For
 506example the following invocations are equivalent:
 507
 508    git --git-dir=a.git --work-tree=b -C c status
 509    git --git-dir=c/a.git --work-tree=c/b status
 510
 511-c <name>=<value>::
 512        Pass a configuration parameter to the command. The value
 513        given will override values from configuration files.
 514        The <name> is expected in the same format as listed by
 515        'git config' (subkeys separated by dots).
 516+
 517Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 518`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 519config file). Including the equals but with an empty value (like `git -c
 520foo.bar= ...`) sets `foo.bar` to the empty string.
 521
 522--exec-path[=<path>]::
 523        Path to wherever your core Git programs are installed.
 524        This can also be controlled by setting the GIT_EXEC_PATH
 525        environment variable. If no path is given, 'git' will print
 526        the current setting and then exit.
 527
 528--html-path::
 529        Print the path, without trailing slash, where Git's HTML
 530        documentation is installed and exit.
 531
 532--man-path::
 533        Print the manpath (see `man(1)`) for the man pages for
 534        this version of Git and exit.
 535
 536--info-path::
 537        Print the path where the Info files documenting this
 538        version of Git are installed and exit.
 539
 540-p::
 541--paginate::
 542        Pipe all output into 'less' (or if set, $PAGER) if standard
 543        output is a terminal.  This overrides the `pager.<cmd>`
 544        configuration options (see the "Configuration Mechanism" section
 545        below).
 546
 547--no-pager::
 548        Do not pipe Git output into a pager.
 549
 550--git-dir=<path>::
 551        Set the path to the repository. This can also be controlled by
 552        setting the GIT_DIR environment variable. It can be an absolute
 553        path or relative path to current working directory.
 554
 555--work-tree=<path>::
 556        Set the path to the working tree. It can be an absolute path
 557        or a path relative to the current working directory.
 558        This can also be controlled by setting the GIT_WORK_TREE
 559        environment variable and the core.worktree configuration
 560        variable (see core.worktree in linkgit:git-config[1] for a
 561        more detailed discussion).
 562
 563--namespace=<path>::
 564        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 565        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 566        variable.
 567
 568--bare::
 569        Treat the repository as a bare repository.  If GIT_DIR
 570        environment is not set, it is set to the current working
 571        directory.
 572
 573--no-replace-objects::
 574        Do not use replacement refs to replace Git objects. See
 575        linkgit:git-replace[1] for more information.
 576
 577--literal-pathspecs::
 578        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 579        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 580        variable to `1`.
 581
 582--glob-pathspecs::
 583        Add "glob" magic to all pathspec. This is equivalent to setting
 584        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 585        globbing on individual pathspecs can be done using pathspec
 586        magic ":(literal)"
 587
 588--noglob-pathspecs::
 589        Add "literal" magic to all pathspec. This is equivalent to setting
 590        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 591        globbing on individual pathspecs can be done using pathspec
 592        magic ":(glob)"
 593
 594--icase-pathspecs::
 595        Add "icase" magic to all pathspec. This is equivalent to setting
 596        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 597
 598GIT COMMANDS
 599------------
 600
 601We divide Git into high level ("porcelain") commands and low level
 602("plumbing") commands.
 603
 604High-level commands (porcelain)
 605-------------------------------
 606
 607We separate the porcelain commands into the main commands and some
 608ancillary user utilities.
 609
 610Main porcelain commands
 611~~~~~~~~~~~~~~~~~~~~~~~
 612
 613include::cmds-mainporcelain.txt[]
 614
 615Ancillary Commands
 616~~~~~~~~~~~~~~~~~~
 617Manipulators:
 618
 619include::cmds-ancillarymanipulators.txt[]
 620
 621Interrogators:
 622
 623include::cmds-ancillaryinterrogators.txt[]
 624
 625
 626Interacting with Others
 627~~~~~~~~~~~~~~~~~~~~~~~
 628
 629These commands are to interact with foreign SCM and with other
 630people via patch over e-mail.
 631
 632include::cmds-foreignscminterface.txt[]
 633
 634
 635Low-level commands (plumbing)
 636-----------------------------
 637
 638Although Git includes its
 639own porcelain layer, its low-level commands are sufficient to support
 640development of alternative porcelains.  Developers of such porcelains
 641might start by reading about linkgit:git-update-index[1] and
 642linkgit:git-read-tree[1].
 643
 644The interface (input, output, set of options and the semantics)
 645to these low-level commands are meant to be a lot more stable
 646than Porcelain level commands, because these commands are
 647primarily for scripted use.  The interface to Porcelain commands
 648on the other hand are subject to change in order to improve the
 649end user experience.
 650
 651The following description divides
 652the low-level commands into commands that manipulate objects (in
 653the repository, index, and working tree), commands that interrogate and
 654compare objects, and commands that move objects and references between
 655repositories.
 656
 657
 658Manipulation commands
 659~~~~~~~~~~~~~~~~~~~~~
 660
 661include::cmds-plumbingmanipulators.txt[]
 662
 663
 664Interrogation commands
 665~~~~~~~~~~~~~~~~~~~~~~
 666
 667include::cmds-plumbinginterrogators.txt[]
 668
 669In general, the interrogate commands do not touch the files in
 670the working tree.
 671
 672
 673Synching repositories
 674~~~~~~~~~~~~~~~~~~~~~
 675
 676include::cmds-synchingrepositories.txt[]
 677
 678The following are helper commands used by the above; end users
 679typically do not use them directly.
 680
 681include::cmds-synchelpers.txt[]
 682
 683
 684Internal helper commands
 685~~~~~~~~~~~~~~~~~~~~~~~~
 686
 687These are internal helper commands used by other commands; end
 688users typically do not use them directly.
 689
 690include::cmds-purehelpers.txt[]
 691
 692
 693Configuration Mechanism
 694-----------------------
 695
 696Git uses a simple text format to store customizations that are per
 697repository and are per user.  Such a configuration file may look
 698like this:
 699
 700------------
 701#
 702# A '#' or ';' character indicates a comment.
 703#
 704
 705; core variables
 706[core]
 707        ; Don't trust file modes
 708        filemode = false
 709
 710; user identity
 711[user]
 712        name = "Junio C Hamano"
 713        email = "gitster@pobox.com"
 714
 715------------
 716
 717Various commands read from the configuration file and adjust
 718their operation accordingly.  See linkgit:git-config[1] for a
 719list and more details about the configuration mechanism.
 720
 721
 722Identifier Terminology
 723----------------------
 724<object>::
 725        Indicates the object name for any type of object.
 726
 727<blob>::
 728        Indicates a blob object name.
 729
 730<tree>::
 731        Indicates a tree object name.
 732
 733<commit>::
 734        Indicates a commit object name.
 735
 736<tree-ish>::
 737        Indicates a tree, commit or tag object name.  A
 738        command that takes a <tree-ish> argument ultimately wants to
 739        operate on a <tree> object but automatically dereferences
 740        <commit> and <tag> objects that point at a <tree>.
 741
 742<commit-ish>::
 743        Indicates a commit or tag object name.  A
 744        command that takes a <commit-ish> argument ultimately wants to
 745        operate on a <commit> object but automatically dereferences
 746        <tag> objects that point at a <commit>.
 747
 748<type>::
 749        Indicates that an object type is required.
 750        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 751
 752<file>::
 753        Indicates a filename - almost always relative to the
 754        root of the tree structure `GIT_INDEX_FILE` describes.
 755
 756Symbolic Identifiers
 757--------------------
 758Any Git command accepting any <object> can also use the following
 759symbolic notation:
 760
 761HEAD::
 762        indicates the head of the current branch.
 763
 764<tag>::
 765        a valid tag 'name'
 766        (i.e. a `refs/tags/<tag>` reference).
 767
 768<head>::
 769        a valid head 'name'
 770        (i.e. a `refs/heads/<head>` reference).
 771
 772For a more complete list of ways to spell object names, see
 773"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 774
 775
 776File/Directory Structure
 777------------------------
 778
 779Please see the linkgit:gitrepository-layout[5] document.
 780
 781Read linkgit:githooks[5] for more details about each hook.
 782
 783Higher level SCMs may provide and manage additional information in the
 784`$GIT_DIR`.
 785
 786
 787Terminology
 788-----------
 789Please see linkgit:gitglossary[7].
 790
 791
 792Environment Variables
 793---------------------
 794Various Git commands use the following environment variables:
 795
 796The Git Repository
 797~~~~~~~~~~~~~~~~~~
 798These environment variables apply to 'all' core Git commands. Nb: it
 799is worth noting that they may be used/overridden by SCMS sitting above
 800Git so take care if using a foreign front-end.
 801
 802'GIT_INDEX_FILE'::
 803        This environment allows the specification of an alternate
 804        index file. If not specified, the default of `$GIT_DIR/index`
 805        is used.
 806
 807'GIT_INDEX_VERSION'::
 808        This environment variable allows the specification of an index
 809        version for new repositories.  It won't affect existing index
 810        files.  By default index file version 2 or 3 is used. See
 811        linkgit:git-update-index[1] for more information.
 812
 813'GIT_OBJECT_DIRECTORY'::
 814        If the object storage directory is specified via this
 815        environment variable then the sha1 directories are created
 816        underneath - otherwise the default `$GIT_DIR/objects`
 817        directory is used.
 818
 819'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 820        Due to the immutable nature of Git objects, old objects can be
 821        archived into shared, read-only directories. This variable
 822        specifies a ":" separated (on Windows ";" separated) list
 823        of Git object directories which can be used to search for Git
 824        objects. New objects will not be written to these directories.
 825
 826'GIT_DIR'::
 827        If the 'GIT_DIR' environment variable is set then it
 828        specifies a path to use instead of the default `.git`
 829        for the base of the repository.
 830        The '--git-dir' command-line option also sets this value.
 831
 832'GIT_WORK_TREE'::
 833        Set the path to the root of the working tree.
 834        This can also be controlled by the '--work-tree' command-line
 835        option and the core.worktree configuration variable.
 836
 837'GIT_NAMESPACE'::
 838        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 839        The '--namespace' command-line option also sets this value.
 840
 841'GIT_CEILING_DIRECTORIES'::
 842        This should be a colon-separated list of absolute paths.  If
 843        set, it is a list of directories that Git should not chdir up
 844        into while looking for a repository directory (useful for
 845        excluding slow-loading network directories).  It will not
 846        exclude the current working directory or a GIT_DIR set on the
 847        command line or in the environment.  Normally, Git has to read
 848        the entries in this list and resolve any symlink that
 849        might be present in order to compare them with the current
 850        directory.  However, if even this access is slow, you
 851        can add an empty entry to the list to tell Git that the
 852        subsequent entries are not symlinks and needn't be resolved;
 853        e.g.,
 854        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 855
 856'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 857        When run in a directory that does not have ".git" repository
 858        directory, Git tries to find such a directory in the parent
 859        directories to find the top of the working tree, but by default it
 860        does not cross filesystem boundaries.  This environment variable
 861        can be set to true to tell Git not to stop at filesystem
 862        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 863        an explicit repository directory set via 'GIT_DIR' or on the
 864        command line.
 865
 866'GIT_COMMON_DIR'::
 867        If this variable is set to a path, non-worktree files that are
 868        normally in $GIT_DIR will be taken from this path
 869        instead. Worktree-specific files such as HEAD or index are
 870        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 871        linkgit:git-worktree[1] for
 872        details. This variable has lower precedence than other path
 873        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 874
 875Git Commits
 876~~~~~~~~~~~
 877'GIT_AUTHOR_NAME'::
 878'GIT_AUTHOR_EMAIL'::
 879'GIT_AUTHOR_DATE'::
 880'GIT_COMMITTER_NAME'::
 881'GIT_COMMITTER_EMAIL'::
 882'GIT_COMMITTER_DATE'::
 883'EMAIL'::
 884        see linkgit:git-commit-tree[1]
 885
 886Git Diffs
 887~~~~~~~~~
 888'GIT_DIFF_OPTS'::
 889        Only valid setting is "--unified=??" or "-u??" to set the
 890        number of context lines shown when a unified diff is created.
 891        This takes precedence over any "-U" or "--unified" option
 892        value passed on the Git diff command line.
 893
 894'GIT_EXTERNAL_DIFF'::
 895        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 896        program named by it is called, instead of the diff invocation
 897        described above.  For a path that is added, removed, or modified,
 898        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 899
 900        path old-file old-hex old-mode new-file new-hex new-mode
 901+
 902where:
 903
 904        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 905                         contents of <old|new>,
 906        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 907        <old|new>-mode:: are the octal representation of the file modes.
 908+
 909The file parameters can point at the user's working file
 910(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 911when a new file is added), or a temporary file (e.g. `old-file` in the
 912index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 913temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 914+
 915For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 916parameter, <path>.
 917+
 918For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 919'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 920
 921'GIT_DIFF_PATH_COUNTER'::
 922        A 1-based counter incremented by one for every path.
 923
 924'GIT_DIFF_PATH_TOTAL'::
 925        The total number of paths.
 926
 927other
 928~~~~~
 929'GIT_MERGE_VERBOSITY'::
 930        A number controlling the amount of output shown by
 931        the recursive merge strategy.  Overrides merge.verbosity.
 932        See linkgit:git-merge[1]
 933
 934'GIT_PAGER'::
 935        This environment variable overrides `$PAGER`. If it is set
 936        to an empty string or to the value "cat", Git will not launch
 937        a pager.  See also the `core.pager` option in
 938        linkgit:git-config[1].
 939
 940'GIT_EDITOR'::
 941        This environment variable overrides `$EDITOR` and `$VISUAL`.
 942        It is used by several Git commands when, on interactive mode,
 943        an editor is to be launched. See also linkgit:git-var[1]
 944        and the `core.editor` option in linkgit:git-config[1].
 945
 946'GIT_SSH'::
 947'GIT_SSH_COMMAND'::
 948        If either of these environment variables is set then 'git fetch'
 949        and 'git push' will use the specified command instead of 'ssh'
 950        when they need to connect to a remote system.
 951        The command will be given exactly two or four arguments: the
 952        'username@host' (or just 'host') from the URL and the shell
 953        command to execute on that remote system, optionally preceded by
 954        '-p' (literally) and the 'port' from the URL when it specifies
 955        something other than the default SSH port.
 956+
 957`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 958by the shell, which allows additional arguments to be included.
 959`$GIT_SSH` on the other hand must be just the path to a program
 960(which can be a wrapper shell script, if additional arguments are
 961needed).
 962+
 963Usually it is easier to configure any desired options through your
 964personal `.ssh/config` file.  Please consult your ssh documentation
 965for further details.
 966
 967'GIT_ASKPASS'::
 968        If this environment variable is set, then Git commands which need to
 969        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 970        will call this program with a suitable prompt as command-line argument
 971        and read the password from its STDOUT. See also the 'core.askPass'
 972        option in linkgit:git-config[1].
 973
 974'GIT_TERMINAL_PROMPT'::
 975        If this environment variable is set to `0`, git will not prompt
 976        on the terminal (e.g., when asking for HTTP authentication).
 977
 978'GIT_CONFIG_NOSYSTEM'::
 979        Whether to skip reading settings from the system-wide
 980        `$(prefix)/etc/gitconfig` file.  This environment variable can
 981        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 982        predictable environment for a picky script, or you can set it
 983        temporarily to avoid using a buggy `/etc/gitconfig` file while
 984        waiting for someone with sufficient permissions to fix it.
 985
 986'GIT_FLUSH'::
 987        If this environment variable is set to "1", then commands such
 988        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 989        'git check-attr' and 'git check-ignore' will
 990        force a flush of the output stream after each record have been
 991        flushed. If this
 992        variable is set to "0", the output of these commands will be done
 993        using completely buffered I/O.   If this environment variable is
 994        not set, Git will choose buffered or record-oriented flushing
 995        based on whether stdout appears to be redirected to a file or not.
 996
 997'GIT_TRACE'::
 998        Enables general trace messages, e.g. alias expansion, built-in
 999        command execution and external command execution.
1000+
1001If this variable is set to "1", "2" or "true" (comparison
1002is case insensitive), trace messages will be printed to
1003stderr.
1004+
1005If the variable is set to an integer value greater than 2
1006and lower than 10 (strictly) then Git will interpret this
1007value as an open file descriptor and will try to write the
1008trace messages into this file descriptor.
1009+
1010Alternatively, if the variable is set to an absolute path
1011(starting with a '/' character), Git will interpret this
1012as a file path and will try to write the trace messages
1013into it.
1014+
1015Unsetting the variable, or setting it to empty, "0" or
1016"false" (case insensitive) disables trace messages.
1017
1018'GIT_TRACE_PACK_ACCESS'::
1019        Enables trace messages for all accesses to any packs. For each
1020        access, the pack file name and an offset in the pack is
1021        recorded. This may be helpful for troubleshooting some
1022        pack-related performance problems.
1023        See 'GIT_TRACE' for available trace output options.
1024
1025'GIT_TRACE_PACKET'::
1026        Enables trace messages for all packets coming in or out of a
1027        given program. This can help with debugging object negotiation
1028        or other protocol issues. Tracing is turned off at a packet
1029        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1030        See 'GIT_TRACE' for available trace output options.
1031
1032'GIT_TRACE_PACKFILE'::
1033        Enables tracing of packfiles sent or received by a
1034        given program. Unlike other trace output, this trace is
1035        verbatim: no headers, and no quoting of binary data. You almost
1036        certainly want to direct into a file (e.g.,
1037        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1038        the terminal or mixing it with other trace output.
1039+
1040Note that this is currently only implemented for the client side
1041of clones and fetches.
1042
1043'GIT_TRACE_PERFORMANCE'::
1044        Enables performance related trace messages, e.g. total execution
1045        time of each Git command.
1046        See 'GIT_TRACE' for available trace output options.
1047
1048'GIT_TRACE_SETUP'::
1049        Enables trace messages printing the .git, working tree and current
1050        working directory after Git has completed its setup phase.
1051        See 'GIT_TRACE' for available trace output options.
1052
1053'GIT_TRACE_SHALLOW'::
1054        Enables trace messages that can help debugging fetching /
1055        cloning of shallow repositories.
1056        See 'GIT_TRACE' for available trace output options.
1057
1058GIT_LITERAL_PATHSPECS::
1059        Setting this variable to `1` will cause Git to treat all
1060        pathspecs literally, rather than as glob patterns. For example,
1061        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1062        for commits that touch the path `*.c`, not any paths that the
1063        glob `*.c` matches. You might want this if you are feeding
1064        literal paths to Git (e.g., paths previously given to you by
1065        `git ls-tree`, `--raw` diff output, etc).
1066
1067GIT_GLOB_PATHSPECS::
1068        Setting this variable to `1` will cause Git to treat all
1069        pathspecs as glob patterns (aka "glob" magic).
1070
1071GIT_NOGLOB_PATHSPECS::
1072        Setting this variable to `1` will cause Git to treat all
1073        pathspecs as literal (aka "literal" magic).
1074
1075GIT_ICASE_PATHSPECS::
1076        Setting this variable to `1` will cause Git to treat all
1077        pathspecs as case-insensitive.
1078
1079'GIT_REFLOG_ACTION'::
1080        When a ref is updated, reflog entries are created to keep
1081        track of the reason why the ref was updated (which is
1082        typically the name of the high-level command that updated
1083        the ref), in addition to the old and new values of the ref.
1084        A scripted Porcelain command can use set_reflog_action
1085        helper function in `git-sh-setup` to set its name to this
1086        variable when it is invoked as the top level command by the
1087        end user, to be recorded in the body of the reflog.
1088
1089`GIT_REF_PARANOIA`::
1090        If set to `1`, include broken or badly named refs when iterating
1091        over lists of refs. In a normal, non-corrupted repository, this
1092        does nothing. However, enabling it may help git to detect and
1093        abort some operations in the presence of broken refs. Git sets
1094        this variable automatically when performing destructive
1095        operations like linkgit:git-prune[1]. You should not need to set
1096        it yourself unless you want to be paranoid about making sure
1097        an operation has touched every ref (e.g., because you are
1098        cloning a repository to make a backup).
1099
1100`GIT_ALLOW_PROTOCOL`::
1101        If set, provide a colon-separated list of protocols which are
1102        allowed to be used with fetch/push/clone. This is useful to
1103        restrict recursive submodule initialization from an untrusted
1104        repository. Any protocol not mentioned will be disallowed (i.e.,
1105        this is a whitelist, not a blacklist). If the variable is not
1106        set at all, all protocols are enabled.  The protocol names
1107        currently used by git are:
1108
1109          - `file`: any local file-based path (including `file://` URLs,
1110            or local paths)
1111
1112          - `git`: the anonymous git protocol over a direct TCP
1113            connection (or proxy, if configured)
1114
1115          - `ssh`: git over ssh (including `host:path` syntax,
1116            `git+ssh://`, etc).
1117
1118          - `rsync`: git over rsync
1119
1120          - `http`: git over http, both "smart http" and "dumb http".
1121            Note that this does _not_ include `https`; if you want both,
1122            you should specify both as `http:https`.
1123
1124          - any external helpers are named by their protocol (e.g., use
1125            `hg` to allow the `git-remote-hg` helper)
1126
1127
1128Discussion[[Discussion]]
1129------------------------
1130
1131More detail on the following is available from the
1132link:user-manual.html#git-concepts[Git concepts chapter of the
1133user-manual] and linkgit:gitcore-tutorial[7].
1134
1135A Git project normally consists of a working directory with a ".git"
1136subdirectory at the top level.  The .git directory contains, among other
1137things, a compressed object database representing the complete history
1138of the project, an "index" file which links that history to the current
1139contents of the working tree, and named pointers into that history such
1140as tags and branch heads.
1141
1142The object database contains objects of three main types: blobs, which
1143hold file data; trees, which point to blobs and other trees to build up
1144directory hierarchies; and commits, which each reference a single tree
1145and some number of parent commits.
1146
1147The commit, equivalent to what other systems call a "changeset" or
1148"version", represents a step in the project's history, and each parent
1149represents an immediately preceding step.  Commits with more than one
1150parent represent merges of independent lines of development.
1151
1152All objects are named by the SHA-1 hash of their contents, normally
1153written as a string of 40 hex digits.  Such names are globally unique.
1154The entire history leading up to a commit can be vouched for by signing
1155just that commit.  A fourth object type, the tag, is provided for this
1156purpose.
1157
1158When first created, objects are stored in individual files, but for
1159efficiency may later be compressed together into "pack files".
1160
1161Named pointers called refs mark interesting points in history.  A ref
1162may contain the SHA-1 name of an object or the name of another ref.  Refs
1163with names beginning `ref/head/` contain the SHA-1 name of the most
1164recent commit (or "head") of a branch under development.  SHA-1 names of
1165tags of interest are stored under `ref/tags/`.  A special ref named
1166`HEAD` contains the name of the currently checked-out branch.
1167
1168The index file is initialized with a list of all paths and, for each
1169path, a blob object and a set of attributes.  The blob object represents
1170the contents of the file as of the head of the current branch.  The
1171attributes (last modified time, size, etc.) are taken from the
1172corresponding file in the working tree.  Subsequent changes to the
1173working tree can be found by comparing these attributes.  The index may
1174be updated with new content, and new commits may be created from the
1175content stored in the index.
1176
1177The index is also capable of storing multiple entries (called "stages")
1178for a given pathname.  These stages are used to hold the various
1179unmerged version of a file when a merge is in progress.
1180
1181FURTHER DOCUMENTATION
1182---------------------
1183
1184See the references in the "description" section to get started
1185using Git.  The following is probably more detail than necessary
1186for a first-time user.
1187
1188The link:user-manual.html#git-concepts[Git concepts chapter of the
1189user-manual] and linkgit:gitcore-tutorial[7] both provide
1190introductions to the underlying Git architecture.
1191
1192See linkgit:gitworkflows[7] for an overview of recommended workflows.
1193
1194See also the link:howto-index.html[howto] documents for some useful
1195examples.
1196
1197The internals are documented in the
1198link:technical/api-index.html[Git API documentation].
1199
1200Users migrating from CVS may also want to
1201read linkgit:gitcvs-migration[7].
1202
1203
1204Authors
1205-------
1206Git was started by Linus Torvalds, and is currently maintained by Junio
1207C Hamano. Numerous contributions have come from the Git mailing list
1208<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1209gives you a more complete list of contributors.
1210
1211If you have a clone of git.git itself, the
1212output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1213the authors for specific parts of the project.
1214
1215Reporting Bugs
1216--------------
1217
1218Report bugs to the Git mailing list <git@vger.kernel.org> where the
1219development and maintenance is primarily done.  You do not have to be
1220subscribed to the list to send a message there.
1221
1222SEE ALSO
1223--------
1224linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1225linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1226linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1227linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1228linkgit:gitworkflows[7]
1229
1230GIT
1231---
1232Part of the linkgit:git[1] suite