Documentation / git.txton commit Merge branch 'aw/push-force-with-lease-reporting' into maint (0eefe10)
   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:v2.7.1/git.html[documentation for release 2.7.1]
  47
  48* release notes for
  49  link:RelNotes/2.7.1.txt[2.7.1],
  50  link:RelNotes/2.7.0.txt[2.7].
  51
  52* link:v2.6.5/git.html[documentation for release 2.6.5]
  53
  54* release notes for
  55  link:RelNotes/2.6.5.txt[2.6.5],
  56  link:RelNotes/2.6.4.txt[2.6.4],
  57  link:RelNotes/2.6.3.txt[2.6.3],
  58  link:RelNotes/2.6.2.txt[2.6.2],
  59  link:RelNotes/2.6.1.txt[2.6.1],
  60  link:RelNotes/2.6.0.txt[2.6].
  61
  62* link:v2.5.4/git.html[documentation for release 2.5.4]
  63
  64* release notes for
  65  link:RelNotes/2.5.4.txt[2.5.4],
  66  link:RelNotes/2.5.3.txt[2.5.3],
  67  link:RelNotes/2.5.2.txt[2.5.2],
  68  link:RelNotes/2.5.1.txt[2.5.1],
  69  link:RelNotes/2.5.0.txt[2.5].
  70
  71* link:v2.4.10/git.html[documentation for release 2.4.10]
  72
  73* release notes for
  74  link:RelNotes/2.4.10.txt[2.4.10],
  75  link:RelNotes/2.4.9.txt[2.4.9],
  76  link:RelNotes/2.4.8.txt[2.4.8],
  77  link:RelNotes/2.4.7.txt[2.4.7],
  78  link:RelNotes/2.4.6.txt[2.4.6],
  79  link:RelNotes/2.4.5.txt[2.4.5],
  80  link:RelNotes/2.4.4.txt[2.4.4],
  81  link:RelNotes/2.4.3.txt[2.4.3],
  82  link:RelNotes/2.4.2.txt[2.4.2],
  83  link:RelNotes/2.4.1.txt[2.4.1],
  84  link:RelNotes/2.4.0.txt[2.4].
  85
  86* link:v2.3.10/git.html[documentation for release 2.3.10]
  87
  88* release notes for
  89  link:RelNotes/2.3.10.txt[2.3.10],
  90  link:RelNotes/2.3.9.txt[2.3.9],
  91  link:RelNotes/2.3.8.txt[2.3.8],
  92  link:RelNotes/2.3.7.txt[2.3.7],
  93  link:RelNotes/2.3.6.txt[2.3.6],
  94  link:RelNotes/2.3.5.txt[2.3.5],
  95  link:RelNotes/2.3.4.txt[2.3.4],
  96  link:RelNotes/2.3.3.txt[2.3.3],
  97  link:RelNotes/2.3.2.txt[2.3.2],
  98  link:RelNotes/2.3.1.txt[2.3.1],
  99  link:RelNotes/2.3.0.txt[2.3].
 100
 101* link:v2.2.3/git.html[documentation for release 2.2.3]
 102
 103* release notes for
 104  link:RelNotes/2.2.3.txt[2.2.3],
 105  link:RelNotes/2.2.2.txt[2.2.2],
 106  link:RelNotes/2.2.1.txt[2.2.1],
 107  link:RelNotes/2.2.0.txt[2.2].
 108
 109* link:v2.1.4/git.html[documentation for release 2.1.4]
 110
 111* release notes for
 112  link:RelNotes/2.1.4.txt[2.1.4],
 113  link:RelNotes/2.1.3.txt[2.1.3],
 114  link:RelNotes/2.1.2.txt[2.1.2],
 115  link:RelNotes/2.1.1.txt[2.1.1],
 116  link:RelNotes/2.1.0.txt[2.1].
 117
 118* link:v2.0.5/git.html[documentation for release 2.0.5]
 119
 120* release notes for
 121  link:RelNotes/2.0.5.txt[2.0.5],
 122  link:RelNotes/2.0.4.txt[2.0.4],
 123  link:RelNotes/2.0.3.txt[2.0.3],
 124  link:RelNotes/2.0.2.txt[2.0.2],
 125  link:RelNotes/2.0.1.txt[2.0.1],
 126  link:RelNotes/2.0.0.txt[2.0.0].
 127
 128* link:v1.9.5/git.html[documentation for release 1.9.5]
 129
 130* release notes for
 131  link:RelNotes/1.9.5.txt[1.9.5],
 132  link:RelNotes/1.9.4.txt[1.9.4],
 133  link:RelNotes/1.9.3.txt[1.9.3],
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 135  link:RelNotes/1.9.1.txt[1.9.1],
 136  link:RelNotes/1.9.0.txt[1.9.0].
 137
 138* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
 139
 140* release notes for
 141  link:RelNotes/1.8.5.6.txt[1.8.5.6],
 142  link:RelNotes/1.8.5.5.txt[1.8.5.5],
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 145  link:RelNotes/1.8.5.2.txt[1.8.5.2],
 146  link:RelNotes/1.8.5.1.txt[1.8.5.1],
 147  link:RelNotes/1.8.5.txt[1.8.5].
 148
 149* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
 150
 151* release notes for
 152  link:RelNotes/1.8.4.5.txt[1.8.4.5],
 153  link:RelNotes/1.8.4.4.txt[1.8.4.4],
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 155  link:RelNotes/1.8.4.2.txt[1.8.4.2],
 156  link:RelNotes/1.8.4.1.txt[1.8.4.1],
 157  link:RelNotes/1.8.4.txt[1.8.4].
 158
 159* link:v1.8.3.4/git.html[documentation for release 1.8.3.4]
 160
 161* release notes for
 162  link:RelNotes/1.8.3.4.txt[1.8.3.4],
 163  link:RelNotes/1.8.3.3.txt[1.8.3.3],
 164  link:RelNotes/1.8.3.2.txt[1.8.3.2],
 165  link:RelNotes/1.8.3.1.txt[1.8.3.1],
 166  link:RelNotes/1.8.3.txt[1.8.3].
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 168* link:v1.8.2.3/git.html[documentation for release 1.8.2.3]
 169
 170* release notes for
 171  link:RelNotes/1.8.2.3.txt[1.8.2.3],
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 174  link:RelNotes/1.8.2.txt[1.8.2].
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 176* link:v1.8.1.6/git.html[documentation for release 1.8.1.6]
 177
 178* release notes for
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 187* link:v1.8.0.3/git.html[documentation for release 1.8.0.3]
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 189* release notes for
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 191  link:RelNotes/1.8.0.2.txt[1.8.0.2],
 192  link:RelNotes/1.8.0.1.txt[1.8.0.1],
 193  link:RelNotes/1.8.0.txt[1.8.0].
 194
 195* link:v1.7.12.4/git.html[documentation for release 1.7.12.4]
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 197* release notes for
 198  link:RelNotes/1.7.12.4.txt[1.7.12.4],
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 202  link:RelNotes/1.7.12.txt[1.7.12].
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 204* link:v1.7.11.7/git.html[documentation for release 1.7.11.7]
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 214  link:RelNotes/1.7.11.txt[1.7.11].
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 216* link:v1.7.10.5/git.html[documentation for release 1.7.10.5]
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 226* link:v1.7.9.7/git.html[documentation for release 1.7.9.7]
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 238* link:v1.7.8.6/git.html[documentation for release 1.7.8.6]
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 249* link:v1.7.7.7/git.html[documentation for release 1.7.7.7]
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 251* release notes for
 252  link:RelNotes/1.7.7.7.txt[1.7.7.7],
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 270  link:RelNotes/1.7.6.txt[1.7.6].
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 272* link:v1.7.5.4/git.html[documentation for release 1.7.5.4]
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 274* release notes for
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 276  link:RelNotes/1.7.5.3.txt[1.7.5.3],
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 290
 291* link:v1.7.3.5/git.html[documentation for release 1.7.3.5]
 292
 293* release notes for
 294  link:RelNotes/1.7.3.5.txt[1.7.3.5],
 295  link:RelNotes/1.7.3.4.txt[1.7.3.4],
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 301* link:v1.7.2.5/git.html[documentation for release 1.7.2.5]
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 310
 311* link:v1.7.1.4/git.html[documentation for release 1.7.1.4]
 312
 313* release notes for
 314  link:RelNotes/1.7.1.4.txt[1.7.1.4],
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 320* link:v1.7.0.9/git.html[documentation for release 1.7.0.9]
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 336* release notes for
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 366* link:v1.6.3.4/git.html[documentation for release 1.6.3.4]
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 427  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 428  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 429  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 430  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 431  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 432  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 433  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 434  link:RelNotes/1.5.4.txt[1.5.4].
 435
 436* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 437
 438* release notes for
 439  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 440  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 441  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 442  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 443  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 444  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 445  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 446  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 447  link:RelNotes/1.5.3.txt[1.5.3].
 448
 449* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 450
 451* release notes for
 452  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 453  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 454  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 455  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 456  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 457  link:RelNotes/1.5.2.txt[1.5.2].
 458
 459* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 460
 461* release notes for
 462  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 463  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 464  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 465  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 466  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 467  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 468  link:RelNotes/1.5.1.txt[1.5.1].
 469
 470* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 471
 472* release notes for
 473  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 474  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 475  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 476  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 477  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 478  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 479  link:RelNotes/1.5.0.txt[1.5.0].
 480
 481* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 482  link:v1.3.3/git.html[1.3.3],
 483  link:v1.2.6/git.html[1.2.6],
 484  link:v1.0.13/git.html[1.0.13].
 485
 486============
 487
 488endif::stalenotes[]
 489
 490OPTIONS
 491-------
 492--version::
 493        Prints the Git suite version that the 'git' program came from.
 494
 495--help::
 496        Prints the synopsis and a list of the most commonly used
 497        commands. If the option '--all' or '-a' is given then all
 498        available commands are printed. If a Git command is named this
 499        option will bring up the manual page for that command.
 500+
 501Other options are available to control how the manual page is
 502displayed. See linkgit:git-help[1] for more information,
 503because `git --help ...` is converted internally into `git
 504help ...`.
 505
 506-C <path>::
 507        Run as if git was started in '<path>' instead of the current working
 508        directory.  When multiple `-C` options are given, each subsequent
 509        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 510        <path>`.
 511+
 512This option affects options that expect path name like `--git-dir` and
 513`--work-tree` in that their interpretations of the path names would be
 514made relative to the working directory caused by the `-C` option. For
 515example the following invocations are equivalent:
 516
 517    git --git-dir=a.git --work-tree=b -C c status
 518    git --git-dir=c/a.git --work-tree=c/b status
 519
 520-c <name>=<value>::
 521        Pass a configuration parameter to the command. The value
 522        given will override values from configuration files.
 523        The <name> is expected in the same format as listed by
 524        'git config' (subkeys separated by dots).
 525+
 526Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 527`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 528config file). Including the equals but with an empty value (like `git -c
 529foo.bar= ...`) sets `foo.bar` to the empty string.
 530
 531--exec-path[=<path>]::
 532        Path to wherever your core Git programs are installed.
 533        This can also be controlled by setting the GIT_EXEC_PATH
 534        environment variable. If no path is given, 'git' will print
 535        the current setting and then exit.
 536
 537--html-path::
 538        Print the path, without trailing slash, where Git's HTML
 539        documentation is installed and exit.
 540
 541--man-path::
 542        Print the manpath (see `man(1)`) for the man pages for
 543        this version of Git and exit.
 544
 545--info-path::
 546        Print the path where the Info files documenting this
 547        version of Git are installed and exit.
 548
 549-p::
 550--paginate::
 551        Pipe all output into 'less' (or if set, $PAGER) if standard
 552        output is a terminal.  This overrides the `pager.<cmd>`
 553        configuration options (see the "Configuration Mechanism" section
 554        below).
 555
 556--no-pager::
 557        Do not pipe Git output into a pager.
 558
 559--git-dir=<path>::
 560        Set the path to the repository. This can also be controlled by
 561        setting the GIT_DIR environment variable. It can be an absolute
 562        path or relative path to current working directory.
 563
 564--work-tree=<path>::
 565        Set the path to the working tree. It can be an absolute path
 566        or a path relative to the current working directory.
 567        This can also be controlled by setting the GIT_WORK_TREE
 568        environment variable and the core.worktree configuration
 569        variable (see core.worktree in linkgit:git-config[1] for a
 570        more detailed discussion).
 571
 572--namespace=<path>::
 573        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 574        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 575        variable.
 576
 577--bare::
 578        Treat the repository as a bare repository.  If GIT_DIR
 579        environment is not set, it is set to the current working
 580        directory.
 581
 582--no-replace-objects::
 583        Do not use replacement refs to replace Git objects. See
 584        linkgit:git-replace[1] for more information.
 585
 586--literal-pathspecs::
 587        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 588        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 589        variable to `1`.
 590
 591--glob-pathspecs::
 592        Add "glob" magic to all pathspec. This is equivalent to setting
 593        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 594        globbing on individual pathspecs can be done using pathspec
 595        magic ":(literal)"
 596
 597--noglob-pathspecs::
 598        Add "literal" magic to all pathspec. This is equivalent to setting
 599        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 600        globbing on individual pathspecs can be done using pathspec
 601        magic ":(glob)"
 602
 603--icase-pathspecs::
 604        Add "icase" magic to all pathspec. This is equivalent to setting
 605        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 606
 607GIT COMMANDS
 608------------
 609
 610We divide Git into high level ("porcelain") commands and low level
 611("plumbing") commands.
 612
 613High-level commands (porcelain)
 614-------------------------------
 615
 616We separate the porcelain commands into the main commands and some
 617ancillary user utilities.
 618
 619Main porcelain commands
 620~~~~~~~~~~~~~~~~~~~~~~~
 621
 622include::cmds-mainporcelain.txt[]
 623
 624Ancillary Commands
 625~~~~~~~~~~~~~~~~~~
 626Manipulators:
 627
 628include::cmds-ancillarymanipulators.txt[]
 629
 630Interrogators:
 631
 632include::cmds-ancillaryinterrogators.txt[]
 633
 634
 635Interacting with Others
 636~~~~~~~~~~~~~~~~~~~~~~~
 637
 638These commands are to interact with foreign SCM and with other
 639people via patch over e-mail.
 640
 641include::cmds-foreignscminterface.txt[]
 642
 643
 644Low-level commands (plumbing)
 645-----------------------------
 646
 647Although Git includes its
 648own porcelain layer, its low-level commands are sufficient to support
 649development of alternative porcelains.  Developers of such porcelains
 650might start by reading about linkgit:git-update-index[1] and
 651linkgit:git-read-tree[1].
 652
 653The interface (input, output, set of options and the semantics)
 654to these low-level commands are meant to be a lot more stable
 655than Porcelain level commands, because these commands are
 656primarily for scripted use.  The interface to Porcelain commands
 657on the other hand are subject to change in order to improve the
 658end user experience.
 659
 660The following description divides
 661the low-level commands into commands that manipulate objects (in
 662the repository, index, and working tree), commands that interrogate and
 663compare objects, and commands that move objects and references between
 664repositories.
 665
 666
 667Manipulation commands
 668~~~~~~~~~~~~~~~~~~~~~
 669
 670include::cmds-plumbingmanipulators.txt[]
 671
 672
 673Interrogation commands
 674~~~~~~~~~~~~~~~~~~~~~~
 675
 676include::cmds-plumbinginterrogators.txt[]
 677
 678In general, the interrogate commands do not touch the files in
 679the working tree.
 680
 681
 682Synching repositories
 683~~~~~~~~~~~~~~~~~~~~~
 684
 685include::cmds-synchingrepositories.txt[]
 686
 687The following are helper commands used by the above; end users
 688typically do not use them directly.
 689
 690include::cmds-synchelpers.txt[]
 691
 692
 693Internal helper commands
 694~~~~~~~~~~~~~~~~~~~~~~~~
 695
 696These are internal helper commands used by other commands; end
 697users typically do not use them directly.
 698
 699include::cmds-purehelpers.txt[]
 700
 701
 702Configuration Mechanism
 703-----------------------
 704
 705Git uses a simple text format to store customizations that are per
 706repository and are per user.  Such a configuration file may look
 707like this:
 708
 709------------
 710#
 711# A '#' or ';' character indicates a comment.
 712#
 713
 714; core variables
 715[core]
 716        ; Don't trust file modes
 717        filemode = false
 718
 719; user identity
 720[user]
 721        name = "Junio C Hamano"
 722        email = "gitster@pobox.com"
 723
 724------------
 725
 726Various commands read from the configuration file and adjust
 727their operation accordingly.  See linkgit:git-config[1] for a
 728list and more details about the configuration mechanism.
 729
 730
 731Identifier Terminology
 732----------------------
 733<object>::
 734        Indicates the object name for any type of object.
 735
 736<blob>::
 737        Indicates a blob object name.
 738
 739<tree>::
 740        Indicates a tree object name.
 741
 742<commit>::
 743        Indicates a commit object name.
 744
 745<tree-ish>::
 746        Indicates a tree, commit or tag object name.  A
 747        command that takes a <tree-ish> argument ultimately wants to
 748        operate on a <tree> object but automatically dereferences
 749        <commit> and <tag> objects that point at a <tree>.
 750
 751<commit-ish>::
 752        Indicates a commit or tag object name.  A
 753        command that takes a <commit-ish> argument ultimately wants to
 754        operate on a <commit> object but automatically dereferences
 755        <tag> objects that point at a <commit>.
 756
 757<type>::
 758        Indicates that an object type is required.
 759        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 760
 761<file>::
 762        Indicates a filename - almost always relative to the
 763        root of the tree structure `GIT_INDEX_FILE` describes.
 764
 765Symbolic Identifiers
 766--------------------
 767Any Git command accepting any <object> can also use the following
 768symbolic notation:
 769
 770HEAD::
 771        indicates the head of the current branch.
 772
 773<tag>::
 774        a valid tag 'name'
 775        (i.e. a `refs/tags/<tag>` reference).
 776
 777<head>::
 778        a valid head 'name'
 779        (i.e. a `refs/heads/<head>` reference).
 780
 781For a more complete list of ways to spell object names, see
 782"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 783
 784
 785File/Directory Structure
 786------------------------
 787
 788Please see the linkgit:gitrepository-layout[5] document.
 789
 790Read linkgit:githooks[5] for more details about each hook.
 791
 792Higher level SCMs may provide and manage additional information in the
 793`$GIT_DIR`.
 794
 795
 796Terminology
 797-----------
 798Please see linkgit:gitglossary[7].
 799
 800
 801Environment Variables
 802---------------------
 803Various Git commands use the following environment variables:
 804
 805The Git Repository
 806~~~~~~~~~~~~~~~~~~
 807These environment variables apply to 'all' core Git commands. Nb: it
 808is worth noting that they may be used/overridden by SCMS sitting above
 809Git so take care if using a foreign front-end.
 810
 811'GIT_INDEX_FILE'::
 812        This environment allows the specification of an alternate
 813        index file. If not specified, the default of `$GIT_DIR/index`
 814        is used.
 815
 816'GIT_INDEX_VERSION'::
 817        This environment variable allows the specification of an index
 818        version for new repositories.  It won't affect existing index
 819        files.  By default index file version 2 or 3 is used. See
 820        linkgit:git-update-index[1] for more information.
 821
 822'GIT_OBJECT_DIRECTORY'::
 823        If the object storage directory is specified via this
 824        environment variable then the sha1 directories are created
 825        underneath - otherwise the default `$GIT_DIR/objects`
 826        directory is used.
 827
 828'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 829        Due to the immutable nature of Git objects, old objects can be
 830        archived into shared, read-only directories. This variable
 831        specifies a ":" separated (on Windows ";" separated) list
 832        of Git object directories which can be used to search for Git
 833        objects. New objects will not be written to these directories.
 834
 835'GIT_DIR'::
 836        If the 'GIT_DIR' environment variable is set then it
 837        specifies a path to use instead of the default `.git`
 838        for the base of the repository.
 839        The '--git-dir' command-line option also sets this value.
 840
 841'GIT_WORK_TREE'::
 842        Set the path to the root of the working tree.
 843        This can also be controlled by the '--work-tree' command-line
 844        option and the core.worktree configuration variable.
 845
 846'GIT_NAMESPACE'::
 847        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 848        The '--namespace' command-line option also sets this value.
 849
 850'GIT_CEILING_DIRECTORIES'::
 851        This should be a colon-separated list of absolute paths.  If
 852        set, it is a list of directories that Git should not chdir up
 853        into while looking for a repository directory (useful for
 854        excluding slow-loading network directories).  It will not
 855        exclude the current working directory or a GIT_DIR set on the
 856        command line or in the environment.  Normally, Git has to read
 857        the entries in this list and resolve any symlink that
 858        might be present in order to compare them with the current
 859        directory.  However, if even this access is slow, you
 860        can add an empty entry to the list to tell Git that the
 861        subsequent entries are not symlinks and needn't be resolved;
 862        e.g.,
 863        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 864
 865'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 866        When run in a directory that does not have ".git" repository
 867        directory, Git tries to find such a directory in the parent
 868        directories to find the top of the working tree, but by default it
 869        does not cross filesystem boundaries.  This environment variable
 870        can be set to true to tell Git not to stop at filesystem
 871        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 872        an explicit repository directory set via 'GIT_DIR' or on the
 873        command line.
 874
 875'GIT_COMMON_DIR'::
 876        If this variable is set to a path, non-worktree files that are
 877        normally in $GIT_DIR will be taken from this path
 878        instead. Worktree-specific files such as HEAD or index are
 879        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 880        linkgit:git-worktree[1] for
 881        details. This variable has lower precedence than other path
 882        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 883
 884Git Commits
 885~~~~~~~~~~~
 886'GIT_AUTHOR_NAME'::
 887'GIT_AUTHOR_EMAIL'::
 888'GIT_AUTHOR_DATE'::
 889'GIT_COMMITTER_NAME'::
 890'GIT_COMMITTER_EMAIL'::
 891'GIT_COMMITTER_DATE'::
 892'EMAIL'::
 893        see linkgit:git-commit-tree[1]
 894
 895Git Diffs
 896~~~~~~~~~
 897'GIT_DIFF_OPTS'::
 898        Only valid setting is "--unified=??" or "-u??" to set the
 899        number of context lines shown when a unified diff is created.
 900        This takes precedence over any "-U" or "--unified" option
 901        value passed on the Git diff command line.
 902
 903'GIT_EXTERNAL_DIFF'::
 904        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 905        program named by it is called, instead of the diff invocation
 906        described above.  For a path that is added, removed, or modified,
 907        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 908
 909        path old-file old-hex old-mode new-file new-hex new-mode
 910+
 911where:
 912
 913        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 914                         contents of <old|new>,
 915        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 916        <old|new>-mode:: are the octal representation of the file modes.
 917+
 918The file parameters can point at the user's working file
 919(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 920when a new file is added), or a temporary file (e.g. `old-file` in the
 921index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 922temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 923+
 924For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 925parameter, <path>.
 926+
 927For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 928'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 929
 930'GIT_DIFF_PATH_COUNTER'::
 931        A 1-based counter incremented by one for every path.
 932
 933'GIT_DIFF_PATH_TOTAL'::
 934        The total number of paths.
 935
 936other
 937~~~~~
 938'GIT_MERGE_VERBOSITY'::
 939        A number controlling the amount of output shown by
 940        the recursive merge strategy.  Overrides merge.verbosity.
 941        See linkgit:git-merge[1]
 942
 943'GIT_PAGER'::
 944        This environment variable overrides `$PAGER`. If it is set
 945        to an empty string or to the value "cat", Git will not launch
 946        a pager.  See also the `core.pager` option in
 947        linkgit:git-config[1].
 948
 949'GIT_EDITOR'::
 950        This environment variable overrides `$EDITOR` and `$VISUAL`.
 951        It is used by several Git commands when, on interactive mode,
 952        an editor is to be launched. See also linkgit:git-var[1]
 953        and the `core.editor` option in linkgit:git-config[1].
 954
 955'GIT_SSH'::
 956'GIT_SSH_COMMAND'::
 957        If either of these environment variables is set then 'git fetch'
 958        and 'git push' will use the specified command instead of 'ssh'
 959        when they need to connect to a remote system.
 960        The command will be given exactly two or four arguments: the
 961        'username@host' (or just 'host') from the URL and the shell
 962        command to execute on that remote system, optionally preceded by
 963        '-p' (literally) and the 'port' from the URL when it specifies
 964        something other than the default SSH port.
 965+
 966`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 967by the shell, which allows additional arguments to be included.
 968`$GIT_SSH` on the other hand must be just the path to a program
 969(which can be a wrapper shell script, if additional arguments are
 970needed).
 971+
 972Usually it is easier to configure any desired options through your
 973personal `.ssh/config` file.  Please consult your ssh documentation
 974for further details.
 975
 976'GIT_ASKPASS'::
 977        If this environment variable is set, then Git commands which need to
 978        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 979        will call this program with a suitable prompt as command-line argument
 980        and read the password from its STDOUT. See also the 'core.askPass'
 981        option in linkgit:git-config[1].
 982
 983'GIT_TERMINAL_PROMPT'::
 984        If this environment variable is set to `0`, git will not prompt
 985        on the terminal (e.g., when asking for HTTP authentication).
 986
 987'GIT_CONFIG_NOSYSTEM'::
 988        Whether to skip reading settings from the system-wide
 989        `$(prefix)/etc/gitconfig` file.  This environment variable can
 990        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 991        predictable environment for a picky script, or you can set it
 992        temporarily to avoid using a buggy `/etc/gitconfig` file while
 993        waiting for someone with sufficient permissions to fix it.
 994
 995'GIT_FLUSH'::
 996        If this environment variable is set to "1", then commands such
 997        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 998        'git check-attr' and 'git check-ignore' will
 999        force a flush of the output stream after each record have been
1000        flushed. If this
1001        variable is set to "0", the output of these commands will be done
1002        using completely buffered I/O.   If this environment variable is
1003        not set, Git will choose buffered or record-oriented flushing
1004        based on whether stdout appears to be redirected to a file or not.
1005
1006'GIT_TRACE'::
1007        Enables general trace messages, e.g. alias expansion, built-in
1008        command execution and external command execution.
1009+
1010If this variable is set to "1", "2" or "true" (comparison
1011is case insensitive), trace messages will be printed to
1012stderr.
1013+
1014If the variable is set to an integer value greater than 2
1015and lower than 10 (strictly) then Git will interpret this
1016value as an open file descriptor and will try to write the
1017trace messages into this file descriptor.
1018+
1019Alternatively, if the variable is set to an absolute path
1020(starting with a '/' character), Git will interpret this
1021as a file path and will try to write the trace messages
1022into it.
1023+
1024Unsetting the variable, or setting it to empty, "0" or
1025"false" (case insensitive) disables trace messages.
1026
1027'GIT_TRACE_PACK_ACCESS'::
1028        Enables trace messages for all accesses to any packs. For each
1029        access, the pack file name and an offset in the pack is
1030        recorded. This may be helpful for troubleshooting some
1031        pack-related performance problems.
1032        See 'GIT_TRACE' for available trace output options.
1033
1034'GIT_TRACE_PACKET'::
1035        Enables trace messages for all packets coming in or out of a
1036        given program. This can help with debugging object negotiation
1037        or other protocol issues. Tracing is turned off at a packet
1038        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1039        See 'GIT_TRACE' for available trace output options.
1040
1041'GIT_TRACE_PACKFILE'::
1042        Enables tracing of packfiles sent or received by a
1043        given program. Unlike other trace output, this trace is
1044        verbatim: no headers, and no quoting of binary data. You almost
1045        certainly want to direct into a file (e.g.,
1046        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1047        the terminal or mixing it with other trace output.
1048+
1049Note that this is currently only implemented for the client side
1050of clones and fetches.
1051
1052'GIT_TRACE_PERFORMANCE'::
1053        Enables performance related trace messages, e.g. total execution
1054        time of each Git command.
1055        See 'GIT_TRACE' for available trace output options.
1056
1057'GIT_TRACE_SETUP'::
1058        Enables trace messages printing the .git, working tree and current
1059        working directory after Git has completed its setup phase.
1060        See 'GIT_TRACE' for available trace output options.
1061
1062'GIT_TRACE_SHALLOW'::
1063        Enables trace messages that can help debugging fetching /
1064        cloning of shallow repositories.
1065        See 'GIT_TRACE' for available trace output options.
1066
1067'GIT_LITERAL_PATHSPECS'::
1068        Setting this variable to `1` will cause Git to treat all
1069        pathspecs literally, rather than as glob patterns. For example,
1070        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1071        for commits that touch the path `*.c`, not any paths that the
1072        glob `*.c` matches. You might want this if you are feeding
1073        literal paths to Git (e.g., paths previously given to you by
1074        `git ls-tree`, `--raw` diff output, etc).
1075
1076'GIT_GLOB_PATHSPECS'::
1077        Setting this variable to `1` will cause Git to treat all
1078        pathspecs as glob patterns (aka "glob" magic).
1079
1080'GIT_NOGLOB_PATHSPECS'::
1081        Setting this variable to `1` will cause Git to treat all
1082        pathspecs as literal (aka "literal" magic).
1083
1084'GIT_ICASE_PATHSPECS'::
1085        Setting this variable to `1` will cause Git to treat all
1086        pathspecs as case-insensitive.
1087
1088'GIT_REFLOG_ACTION'::
1089        When a ref is updated, reflog entries are created to keep
1090        track of the reason why the ref was updated (which is
1091        typically the name of the high-level command that updated
1092        the ref), in addition to the old and new values of the ref.
1093        A scripted Porcelain command can use set_reflog_action
1094        helper function in `git-sh-setup` to set its name to this
1095        variable when it is invoked as the top level command by the
1096        end user, to be recorded in the body of the reflog.
1097
1098'GIT_REF_PARANOIA'::
1099        If set to `1`, include broken or badly named refs when iterating
1100        over lists of refs. In a normal, non-corrupted repository, this
1101        does nothing. However, enabling it may help git to detect and
1102        abort some operations in the presence of broken refs. Git sets
1103        this variable automatically when performing destructive
1104        operations like linkgit:git-prune[1]. You should not need to set
1105        it yourself unless you want to be paranoid about making sure
1106        an operation has touched every ref (e.g., because you are
1107        cloning a repository to make a backup).
1108
1109'GIT_ALLOW_PROTOCOL'::
1110        If set, provide a colon-separated list of protocols which are
1111        allowed to be used with fetch/push/clone. This is useful to
1112        restrict recursive submodule initialization from an untrusted
1113        repository. Any protocol not mentioned will be disallowed (i.e.,
1114        this is a whitelist, not a blacklist). If the variable is not
1115        set at all, all protocols are enabled.  The protocol names
1116        currently used by git are:
1117
1118          - `file`: any local file-based path (including `file://` URLs,
1119            or local paths)
1120
1121          - `git`: the anonymous git protocol over a direct TCP
1122            connection (or proxy, if configured)
1123
1124          - `ssh`: git over ssh (including `host:path` syntax,
1125            `git+ssh://`, etc).
1126
1127          - `rsync`: git over rsync
1128
1129          - `http`: git over http, both "smart http" and "dumb http".
1130            Note that this does _not_ include `https`; if you want both,
1131            you should specify both as `http:https`.
1132
1133          - any external helpers are named by their protocol (e.g., use
1134            `hg` to allow the `git-remote-hg` helper)
1135
1136
1137Discussion[[Discussion]]
1138------------------------
1139
1140More detail on the following is available from the
1141link:user-manual.html#git-concepts[Git concepts chapter of the
1142user-manual] and linkgit:gitcore-tutorial[7].
1143
1144A Git project normally consists of a working directory with a ".git"
1145subdirectory at the top level.  The .git directory contains, among other
1146things, a compressed object database representing the complete history
1147of the project, an "index" file which links that history to the current
1148contents of the working tree, and named pointers into that history such
1149as tags and branch heads.
1150
1151The object database contains objects of three main types: blobs, which
1152hold file data; trees, which point to blobs and other trees to build up
1153directory hierarchies; and commits, which each reference a single tree
1154and some number of parent commits.
1155
1156The commit, equivalent to what other systems call a "changeset" or
1157"version", represents a step in the project's history, and each parent
1158represents an immediately preceding step.  Commits with more than one
1159parent represent merges of independent lines of development.
1160
1161All objects are named by the SHA-1 hash of their contents, normally
1162written as a string of 40 hex digits.  Such names are globally unique.
1163The entire history leading up to a commit can be vouched for by signing
1164just that commit.  A fourth object type, the tag, is provided for this
1165purpose.
1166
1167When first created, objects are stored in individual files, but for
1168efficiency may later be compressed together into "pack files".
1169
1170Named pointers called refs mark interesting points in history.  A ref
1171may contain the SHA-1 name of an object or the name of another ref.  Refs
1172with names beginning `ref/head/` contain the SHA-1 name of the most
1173recent commit (or "head") of a branch under development.  SHA-1 names of
1174tags of interest are stored under `ref/tags/`.  A special ref named
1175`HEAD` contains the name of the currently checked-out branch.
1176
1177The index file is initialized with a list of all paths and, for each
1178path, a blob object and a set of attributes.  The blob object represents
1179the contents of the file as of the head of the current branch.  The
1180attributes (last modified time, size, etc.) are taken from the
1181corresponding file in the working tree.  Subsequent changes to the
1182working tree can be found by comparing these attributes.  The index may
1183be updated with new content, and new commits may be created from the
1184content stored in the index.
1185
1186The index is also capable of storing multiple entries (called "stages")
1187for a given pathname.  These stages are used to hold the various
1188unmerged version of a file when a merge is in progress.
1189
1190FURTHER DOCUMENTATION
1191---------------------
1192
1193See the references in the "description" section to get started
1194using Git.  The following is probably more detail than necessary
1195for a first-time user.
1196
1197The link:user-manual.html#git-concepts[Git concepts chapter of the
1198user-manual] and linkgit:gitcore-tutorial[7] both provide
1199introductions to the underlying Git architecture.
1200
1201See linkgit:gitworkflows[7] for an overview of recommended workflows.
1202
1203See also the link:howto-index.html[howto] documents for some useful
1204examples.
1205
1206The internals are documented in the
1207link:technical/api-index.html[Git API documentation].
1208
1209Users migrating from CVS may also want to
1210read linkgit:gitcvs-migration[7].
1211
1212
1213Authors
1214-------
1215Git was started by Linus Torvalds, and is currently maintained by Junio
1216C Hamano. Numerous contributions have come from the Git mailing list
1217<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1218gives you a more complete list of contributors.
1219
1220If you have a clone of git.git itself, the
1221output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1222the authors for specific parts of the project.
1223
1224Reporting Bugs
1225--------------
1226
1227Report bugs to the Git mailing list <git@vger.kernel.org> where the
1228development and maintenance is primarily done.  You do not have to be
1229subscribed to the list to send a message there.
1230
1231SEE ALSO
1232--------
1233linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1234linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1235linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1236linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1237linkgit:gitworkflows[7]
1238
1239GIT
1240---
1241Part of the linkgit:git[1] suite