Documentation / git.txton commit Git 2.1 (6c4ab27)
   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
  25link:everyday.html[Everyday Git] 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:v2.1.0/git.html[documentation for release 2.1]
  47
  48* release notes for
  49  link:RelNotes/2.1.0.txt[2.1].
  50
  51* link:v2.0.4/git.html[documentation for release 2.0.4]
  52
  53* release notes for
  54  link:RelNotes/2.0.4.txt[2.0.4],
  55  link:RelNotes/2.0.3.txt[2.0.3],
  56  link:RelNotes/2.0.2.txt[2.0.2],
  57  link:RelNotes/2.0.1.txt[2.0.1],
  58  link:RelNotes/2.0.0.txt[2.0.0].
  59
  60* link:v1.9.4/git.html[documentation for release 1.9.4]
  61
  62* release notes for
  63  link:RelNotes/1.9.4.txt[1.9.4],
  64  link:RelNotes/1.9.3.txt[1.9.3],
  65  link:RelNotes/1.9.2.txt[1.9.2],
  66  link:RelNotes/1.9.1.txt[1.9.1],
  67  link:RelNotes/1.9.0.txt[1.9.0].
  68
  69* link:v1.8.5.5/git.html[documentation for release 1.8.5.5]
  70
  71* release notes for
  72  link:RelNotes/1.8.5.5.txt[1.8.5.5],
  73  link:RelNotes/1.8.5.4.txt[1.8.5.4],
  74  link:RelNotes/1.8.5.3.txt[1.8.5.3],
  75  link:RelNotes/1.8.5.2.txt[1.8.5.2],
  76  link:RelNotes/1.8.5.1.txt[1.8.5.1],
  77  link:RelNotes/1.8.5.txt[1.8.5].
  78
  79* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
  80
  81* release notes for
  82  link:RelNotes/1.8.4.5.txt[1.8.4.5],
  83  link:RelNotes/1.8.4.4.txt[1.8.4.4],
  84  link:RelNotes/1.8.4.3.txt[1.8.4.3],
  85  link:RelNotes/1.8.4.2.txt[1.8.4.2],
  86  link:RelNotes/1.8.4.1.txt[1.8.4.1],
  87  link:RelNotes/1.8.4.txt[1.8.4].
  88
  89* link:v1.8.3.4/git.html[documentation for release 1.8.3.4]
  90
  91* release notes for
  92  link:RelNotes/1.8.3.4.txt[1.8.3.4],
  93  link:RelNotes/1.8.3.3.txt[1.8.3.3],
  94  link:RelNotes/1.8.3.2.txt[1.8.3.2],
  95  link:RelNotes/1.8.3.1.txt[1.8.3.1],
  96  link:RelNotes/1.8.3.txt[1.8.3].
  97
  98* link:v1.8.2.3/git.html[documentation for release 1.8.2.3]
  99
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 104  link:RelNotes/1.8.2.txt[1.8.2].
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 115  link:RelNotes/1.8.1.txt[1.8.1].
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 117* link:v1.8.0.3/git.html[documentation for release 1.8.0.3]
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 123  link:RelNotes/1.8.0.txt[1.8.0].
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 125* link:v1.7.12.4/git.html[documentation for release 1.7.12.4]
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 131  link:RelNotes/1.7.12.1.txt[1.7.12.1],
 132  link:RelNotes/1.7.12.txt[1.7.12].
 133
 134* link:v1.7.11.7/git.html[documentation for release 1.7.11.7]
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 144  link:RelNotes/1.7.11.txt[1.7.11].
 145
 146* link:v1.7.10.5/git.html[documentation for release 1.7.10.5]
 147
 148* release notes for
 149  link:RelNotes/1.7.10.5.txt[1.7.10.5],
 150  link:RelNotes/1.7.10.4.txt[1.7.10.4],
 151  link:RelNotes/1.7.10.3.txt[1.7.10.3],
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 154  link:RelNotes/1.7.10.txt[1.7.10].
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 156* link:v1.7.9.7/git.html[documentation for release 1.7.9.7]
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 166  link:RelNotes/1.7.9.txt[1.7.9].
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 168* link:v1.7.8.6/git.html[documentation for release 1.7.8.6]
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 177  link:RelNotes/1.7.8.txt[1.7.8].
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 179* link:v1.7.7.7/git.html[documentation for release 1.7.7.7]
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 189  link:RelNotes/1.7.7.txt[1.7.7].
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 191* link:v1.7.6.6/git.html[documentation for release 1.7.6.6]
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 194  link:RelNotes/1.7.6.6.txt[1.7.6.6],
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 200  link:RelNotes/1.7.6.txt[1.7.6].
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 241* link:v1.7.1.4/git.html[documentation for release 1.7.1.4]
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 285
 286* link:v1.6.4.5/git.html[documentation for release 1.6.4.5]
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 294  link:RelNotes/1.6.4.txt[1.6.4].
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 296* link:v1.6.3.4/git.html[documentation for release 1.6.3.4]
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 303  link:RelNotes/1.6.3.txt[1.6.3].
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 310  link:RelNotes/1.6.2.1.txt[1.6.2.1],
 311  link:RelNotes/1.6.2.txt[1.6.2].
 312
 313* link:v1.6.1.3/git.html[documentation for release 1.6.1.3]
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 316  link:RelNotes/1.6.1.3.txt[1.6.1.3],
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 319  link:RelNotes/1.6.1.txt[1.6.1].
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 321* link:v1.6.0.6/git.html[documentation for release 1.6.0.6]
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 332* link:v1.5.6.6/git.html[documentation for release 1.5.6.6]
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 341  link:RelNotes/1.5.6.txt[1.5.6].
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 343* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
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 347  link:RelNotes/1.5.5.5.txt[1.5.5.5],
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 353
 354* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 355
 356* release notes for
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 366* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
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 388
 389* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 390
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 392  link:RelNotes/1.5.1.6.txt[1.5.1.6],
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 398  link:RelNotes/1.5.1.txt[1.5.1].
 399
 400* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
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 403  link:RelNotes/1.5.0.7.txt[1.5.0.7],
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 410
 411* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 412  link:v1.3.3/git.html[1.3.3],
 413  link:v1.2.6/git.html[1.2.6],
 414  link:v1.0.13/git.html[1.0.13].
 415
 416============
 417
 418endif::stalenotes[]
 419
 420OPTIONS
 421-------
 422--version::
 423        Prints the Git suite version that the 'git' program came from.
 424
 425--help::
 426        Prints the synopsis and a list of the most commonly used
 427        commands. If the option '--all' or '-a' is given then all
 428        available commands are printed. If a Git command is named this
 429        option will bring up the manual page for that command.
 430+
 431Other options are available to control how the manual page is
 432displayed. See linkgit:git-help[1] for more information,
 433because `git --help ...` is converted internally into `git
 434help ...`.
 435
 436-C <path>::
 437        Run as if git was started in '<path>' instead of the current working
 438        directory.  When multiple `-C` options are given, each subsequent
 439        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 440        <path>`.
 441+
 442This option affects options that expect path name like `--git-dir` and
 443`--work-tree` in that their interpretations of the path names would be
 444made relative to the working directory caused by the `-C` option. For
 445example the following invocations are equivalent:
 446
 447    git --git-dir=a.git --work-tree=b -C c status
 448    git --git-dir=c/a.git --work-tree=c/b status
 449
 450-c <name>=<value>::
 451        Pass a configuration parameter to the command. The value
 452        given will override values from configuration files.
 453        The <name> is expected in the same format as listed by
 454        'git config' (subkeys separated by dots).
 455
 456--exec-path[=<path>]::
 457        Path to wherever your core Git programs are installed.
 458        This can also be controlled by setting the GIT_EXEC_PATH
 459        environment variable. If no path is given, 'git' will print
 460        the current setting and then exit.
 461
 462--html-path::
 463        Print the path, without trailing slash, where Git's HTML
 464        documentation is installed and exit.
 465
 466--man-path::
 467        Print the manpath (see `man(1)`) for the man pages for
 468        this version of Git and exit.
 469
 470--info-path::
 471        Print the path where the Info files documenting this
 472        version of Git are installed and exit.
 473
 474-p::
 475--paginate::
 476        Pipe all output into 'less' (or if set, $PAGER) if standard
 477        output is a terminal.  This overrides the `pager.<cmd>`
 478        configuration options (see the "Configuration Mechanism" section
 479        below).
 480
 481--no-pager::
 482        Do not pipe Git output into a pager.
 483
 484--git-dir=<path>::
 485        Set the path to the repository. This can also be controlled by
 486        setting the GIT_DIR environment variable. It can be an absolute
 487        path or relative path to current working directory.
 488
 489--work-tree=<path>::
 490        Set the path to the working tree. It can be an absolute path
 491        or a path relative to the current working directory.
 492        This can also be controlled by setting the GIT_WORK_TREE
 493        environment variable and the core.worktree configuration
 494        variable (see core.worktree in linkgit:git-config[1] for a
 495        more detailed discussion).
 496
 497--namespace=<path>::
 498        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 499        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 500        variable.
 501
 502--bare::
 503        Treat the repository as a bare repository.  If GIT_DIR
 504        environment is not set, it is set to the current working
 505        directory.
 506
 507--no-replace-objects::
 508        Do not use replacement refs to replace Git objects. See
 509        linkgit:git-replace[1] for more information.
 510
 511--literal-pathspecs::
 512        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 513        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 514        variable to `1`.
 515
 516--glob-pathspecs::
 517        Add "glob" magic to all pathspec. This is equivalent to setting
 518        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 519        globbing on individual pathspecs can be done using pathspec
 520        magic ":(literal)"
 521
 522--noglob-pathspecs::
 523        Add "literal" magic to all pathspec. This is equivalent to setting
 524        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 525        globbing on individual pathspecs can be done using pathspec
 526        magic ":(glob)"
 527
 528--icase-pathspecs::
 529        Add "icase" magic to all pathspec. This is equivalent to setting
 530        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 531
 532GIT COMMANDS
 533------------
 534
 535We divide Git into high level ("porcelain") commands and low level
 536("plumbing") commands.
 537
 538High-level commands (porcelain)
 539-------------------------------
 540
 541We separate the porcelain commands into the main commands and some
 542ancillary user utilities.
 543
 544Main porcelain commands
 545~~~~~~~~~~~~~~~~~~~~~~~
 546
 547include::cmds-mainporcelain.txt[]
 548
 549Ancillary Commands
 550~~~~~~~~~~~~~~~~~~
 551Manipulators:
 552
 553include::cmds-ancillarymanipulators.txt[]
 554
 555Interrogators:
 556
 557include::cmds-ancillaryinterrogators.txt[]
 558
 559
 560Interacting with Others
 561~~~~~~~~~~~~~~~~~~~~~~~
 562
 563These commands are to interact with foreign SCM and with other
 564people via patch over e-mail.
 565
 566include::cmds-foreignscminterface.txt[]
 567
 568
 569Low-level commands (plumbing)
 570-----------------------------
 571
 572Although Git includes its
 573own porcelain layer, its low-level commands are sufficient to support
 574development of alternative porcelains.  Developers of such porcelains
 575might start by reading about linkgit:git-update-index[1] and
 576linkgit:git-read-tree[1].
 577
 578The interface (input, output, set of options and the semantics)
 579to these low-level commands are meant to be a lot more stable
 580than Porcelain level commands, because these commands are
 581primarily for scripted use.  The interface to Porcelain commands
 582on the other hand are subject to change in order to improve the
 583end user experience.
 584
 585The following description divides
 586the low-level commands into commands that manipulate objects (in
 587the repository, index, and working tree), commands that interrogate and
 588compare objects, and commands that move objects and references between
 589repositories.
 590
 591
 592Manipulation commands
 593~~~~~~~~~~~~~~~~~~~~~
 594
 595include::cmds-plumbingmanipulators.txt[]
 596
 597
 598Interrogation commands
 599~~~~~~~~~~~~~~~~~~~~~~
 600
 601include::cmds-plumbinginterrogators.txt[]
 602
 603In general, the interrogate commands do not touch the files in
 604the working tree.
 605
 606
 607Synching repositories
 608~~~~~~~~~~~~~~~~~~~~~
 609
 610include::cmds-synchingrepositories.txt[]
 611
 612The following are helper commands used by the above; end users
 613typically do not use them directly.
 614
 615include::cmds-synchelpers.txt[]
 616
 617
 618Internal helper commands
 619~~~~~~~~~~~~~~~~~~~~~~~~
 620
 621These are internal helper commands used by other commands; end
 622users typically do not use them directly.
 623
 624include::cmds-purehelpers.txt[]
 625
 626
 627Configuration Mechanism
 628-----------------------
 629
 630Git uses a simple text format to store customizations that are per
 631repository and are per user.  Such a configuration file may look
 632like this:
 633
 634------------
 635#
 636# A '#' or ';' character indicates a comment.
 637#
 638
 639; core variables
 640[core]
 641        ; Don't trust file modes
 642        filemode = false
 643
 644; user identity
 645[user]
 646        name = "Junio C Hamano"
 647        email = "gitster@pobox.com"
 648
 649------------
 650
 651Various commands read from the configuration file and adjust
 652their operation accordingly.  See linkgit:git-config[1] for a
 653list and more details about the configuration mechanism.
 654
 655
 656Identifier Terminology
 657----------------------
 658<object>::
 659        Indicates the object name for any type of object.
 660
 661<blob>::
 662        Indicates a blob object name.
 663
 664<tree>::
 665        Indicates a tree object name.
 666
 667<commit>::
 668        Indicates a commit object name.
 669
 670<tree-ish>::
 671        Indicates a tree, commit or tag object name.  A
 672        command that takes a <tree-ish> argument ultimately wants to
 673        operate on a <tree> object but automatically dereferences
 674        <commit> and <tag> objects that point at a <tree>.
 675
 676<commit-ish>::
 677        Indicates a commit or tag object name.  A
 678        command that takes a <commit-ish> argument ultimately wants to
 679        operate on a <commit> object but automatically dereferences
 680        <tag> objects that point at a <commit>.
 681
 682<type>::
 683        Indicates that an object type is required.
 684        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 685
 686<file>::
 687        Indicates a filename - almost always relative to the
 688        root of the tree structure `GIT_INDEX_FILE` describes.
 689
 690Symbolic Identifiers
 691--------------------
 692Any Git command accepting any <object> can also use the following
 693symbolic notation:
 694
 695HEAD::
 696        indicates the head of the current branch.
 697
 698<tag>::
 699        a valid tag 'name'
 700        (i.e. a `refs/tags/<tag>` reference).
 701
 702<head>::
 703        a valid head 'name'
 704        (i.e. a `refs/heads/<head>` reference).
 705
 706For a more complete list of ways to spell object names, see
 707"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 708
 709
 710File/Directory Structure
 711------------------------
 712
 713Please see the linkgit:gitrepository-layout[5] document.
 714
 715Read linkgit:githooks[5] for more details about each hook.
 716
 717Higher level SCMs may provide and manage additional information in the
 718`$GIT_DIR`.
 719
 720
 721Terminology
 722-----------
 723Please see linkgit:gitglossary[7].
 724
 725
 726Environment Variables
 727---------------------
 728Various Git commands use the following environment variables:
 729
 730The Git Repository
 731~~~~~~~~~~~~~~~~~~
 732These environment variables apply to 'all' core Git commands. Nb: it
 733is worth noting that they may be used/overridden by SCMS sitting above
 734Git so take care if using Cogito etc.
 735
 736'GIT_INDEX_FILE'::
 737        This environment allows the specification of an alternate
 738        index file. If not specified, the default of `$GIT_DIR/index`
 739        is used.
 740
 741'GIT_INDEX_VERSION'::
 742        This environment variable allows the specification of an index
 743        version for new repositories.  It won't affect existing index
 744        files.  By default index file version [23] is used.
 745
 746'GIT_OBJECT_DIRECTORY'::
 747        If the object storage directory is specified via this
 748        environment variable then the sha1 directories are created
 749        underneath - otherwise the default `$GIT_DIR/objects`
 750        directory is used.
 751
 752'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 753        Due to the immutable nature of Git objects, old objects can be
 754        archived into shared, read-only directories. This variable
 755        specifies a ":" separated (on Windows ";" separated) list
 756        of Git object directories which can be used to search for Git
 757        objects. New objects will not be written to these directories.
 758
 759'GIT_DIR'::
 760        If the 'GIT_DIR' environment variable is set then it
 761        specifies a path to use instead of the default `.git`
 762        for the base of the repository.
 763        The '--git-dir' command-line option also sets this value.
 764
 765'GIT_WORK_TREE'::
 766        Set the path to the root of the working tree.
 767        This can also be controlled by the '--work-tree' command-line
 768        option and the core.worktree configuration variable.
 769
 770'GIT_NAMESPACE'::
 771        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 772        The '--namespace' command-line option also sets this value.
 773
 774'GIT_CEILING_DIRECTORIES'::
 775        This should be a colon-separated list of absolute paths.  If
 776        set, it is a list of directories that Git should not chdir up
 777        into while looking for a repository directory (useful for
 778        excluding slow-loading network directories).  It will not
 779        exclude the current working directory or a GIT_DIR set on the
 780        command line or in the environment.  Normally, Git has to read
 781        the entries in this list and resolve any symlink that
 782        might be present in order to compare them with the current
 783        directory.  However, if even this access is slow, you
 784        can add an empty entry to the list to tell Git that the
 785        subsequent entries are not symlinks and needn't be resolved;
 786        e.g.,
 787        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 788
 789'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 790        When run in a directory that does not have ".git" repository
 791        directory, Git tries to find such a directory in the parent
 792        directories to find the top of the working tree, but by default it
 793        does not cross filesystem boundaries.  This environment variable
 794        can be set to true to tell Git not to stop at filesystem
 795        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 796        an explicit repository directory set via 'GIT_DIR' or on the
 797        command line.
 798
 799Git Commits
 800~~~~~~~~~~~
 801'GIT_AUTHOR_NAME'::
 802'GIT_AUTHOR_EMAIL'::
 803'GIT_AUTHOR_DATE'::
 804'GIT_COMMITTER_NAME'::
 805'GIT_COMMITTER_EMAIL'::
 806'GIT_COMMITTER_DATE'::
 807'EMAIL'::
 808        see linkgit:git-commit-tree[1]
 809
 810Git Diffs
 811~~~~~~~~~
 812'GIT_DIFF_OPTS'::
 813        Only valid setting is "--unified=??" or "-u??" to set the
 814        number of context lines shown when a unified diff is created.
 815        This takes precedence over any "-U" or "--unified" option
 816        value passed on the Git diff command line.
 817
 818'GIT_EXTERNAL_DIFF'::
 819        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 820        program named by it is called, instead of the diff invocation
 821        described above.  For a path that is added, removed, or modified,
 822        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 823
 824        path old-file old-hex old-mode new-file new-hex new-mode
 825+
 826where:
 827
 828        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 829                         contents of <old|new>,
 830        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 831        <old|new>-mode:: are the octal representation of the file modes.
 832+
 833The file parameters can point at the user's working file
 834(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 835when a new file is added), or a temporary file (e.g. `old-file` in the
 836index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 837temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 838+
 839For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 840parameter, <path>.
 841+
 842For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 843'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 844
 845'GIT_DIFF_PATH_COUNTER'::
 846        A 1-based counter incremented by one for every path.
 847
 848'GIT_DIFF_PATH_TOTAL'::
 849        The total number of paths.
 850
 851other
 852~~~~~
 853'GIT_MERGE_VERBOSITY'::
 854        A number controlling the amount of output shown by
 855        the recursive merge strategy.  Overrides merge.verbosity.
 856        See linkgit:git-merge[1]
 857
 858'GIT_PAGER'::
 859        This environment variable overrides `$PAGER`. If it is set
 860        to an empty string or to the value "cat", Git will not launch
 861        a pager.  See also the `core.pager` option in
 862        linkgit:git-config[1].
 863
 864'GIT_EDITOR'::
 865        This environment variable overrides `$EDITOR` and `$VISUAL`.
 866        It is used by several Git commands when, on interactive mode,
 867        an editor is to be launched. See also linkgit:git-var[1]
 868        and the `core.editor` option in linkgit:git-config[1].
 869
 870'GIT_SSH'::
 871        If this environment variable is set then 'git fetch'
 872        and 'git push' will use this command instead
 873        of 'ssh' when they need to connect to a remote system.
 874        The '$GIT_SSH' command will be given exactly two or
 875        four arguments: the 'username@host' (or just 'host')
 876        from the URL and the shell command to execute on that
 877        remote system, optionally preceded by '-p' (literally) and
 878        the 'port' from the URL when it specifies something other
 879        than the default SSH port.
 880+
 881To pass options to the program that you want to list in GIT_SSH
 882you will need to wrap the program and options into a shell script,
 883then set GIT_SSH to refer to the shell script.
 884+
 885Usually it is easier to configure any desired options through your
 886personal `.ssh/config` file.  Please consult your ssh documentation
 887for further details.
 888
 889'GIT_ASKPASS'::
 890        If this environment variable is set, then Git commands which need to
 891        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 892        will call this program with a suitable prompt as command-line argument
 893        and read the password from its STDOUT. See also the 'core.askpass'
 894        option in linkgit:git-config[1].
 895
 896'GIT_CONFIG_NOSYSTEM'::
 897        Whether to skip reading settings from the system-wide
 898        `$(prefix)/etc/gitconfig` file.  This environment variable can
 899        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 900        predictable environment for a picky script, or you can set it
 901        temporarily to avoid using a buggy `/etc/gitconfig` file while
 902        waiting for someone with sufficient permissions to fix it.
 903
 904'GIT_FLUSH'::
 905        If this environment variable is set to "1", then commands such
 906        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 907        'git check-attr' and 'git check-ignore' will
 908        force a flush of the output stream after each record have been
 909        flushed. If this
 910        variable is set to "0", the output of these commands will be done
 911        using completely buffered I/O.   If this environment variable is
 912        not set, Git will choose buffered or record-oriented flushing
 913        based on whether stdout appears to be redirected to a file or not.
 914
 915'GIT_TRACE'::
 916        Enables general trace messages, e.g. alias expansion, built-in
 917        command execution and external command execution.
 918+
 919If this variable is set to "1", "2" or "true" (comparison
 920is case insensitive), trace messages will be printed to
 921stderr.
 922+
 923If the variable is set to an integer value greater than 2
 924and lower than 10 (strictly) then Git will interpret this
 925value as an open file descriptor and will try to write the
 926trace messages into this file descriptor.
 927+
 928Alternatively, if the variable is set to an absolute path
 929(starting with a '/' character), Git will interpret this
 930as a file path and will try to write the trace messages
 931into it.
 932+
 933Unsetting the variable, or setting it to empty, "0" or
 934"false" (case insensitive) disables trace messages.
 935
 936'GIT_TRACE_PACK_ACCESS'::
 937        Enables trace messages for all accesses to any packs. For each
 938        access, the pack file name and an offset in the pack is
 939        recorded. This may be helpful for troubleshooting some
 940        pack-related performance problems.
 941        See 'GIT_TRACE' for available trace output options.
 942
 943'GIT_TRACE_PACKET'::
 944        Enables trace messages for all packets coming in or out of a
 945        given program. This can help with debugging object negotiation
 946        or other protocol issues. Tracing is turned off at a packet
 947        starting with "PACK".
 948        See 'GIT_TRACE' for available trace output options.
 949
 950'GIT_TRACE_PERFORMANCE'::
 951        Enables performance related trace messages, e.g. total execution
 952        time of each Git command.
 953        See 'GIT_TRACE' for available trace output options.
 954
 955'GIT_TRACE_SETUP'::
 956        Enables trace messages printing the .git, working tree and current
 957        working directory after Git has completed its setup phase.
 958        See 'GIT_TRACE' for available trace output options.
 959
 960'GIT_TRACE_SHALLOW'::
 961        Enables trace messages that can help debugging fetching /
 962        cloning of shallow repositories.
 963        See 'GIT_TRACE' for available trace output options.
 964
 965GIT_LITERAL_PATHSPECS::
 966        Setting this variable to `1` will cause Git to treat all
 967        pathspecs literally, rather than as glob patterns. For example,
 968        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
 969        for commits that touch the path `*.c`, not any paths that the
 970        glob `*.c` matches. You might want this if you are feeding
 971        literal paths to Git (e.g., paths previously given to you by
 972        `git ls-tree`, `--raw` diff output, etc).
 973
 974GIT_GLOB_PATHSPECS::
 975        Setting this variable to `1` will cause Git to treat all
 976        pathspecs as glob patterns (aka "glob" magic).
 977
 978GIT_NOGLOB_PATHSPECS::
 979        Setting this variable to `1` will cause Git to treat all
 980        pathspecs as literal (aka "literal" magic).
 981
 982GIT_ICASE_PATHSPECS::
 983        Setting this variable to `1` will cause Git to treat all
 984        pathspecs as case-insensitive.
 985
 986'GIT_REFLOG_ACTION'::
 987        When a ref is updated, reflog entries are created to keep
 988        track of the reason why the ref was updated (which is
 989        typically the name of the high-level command that updated
 990        the ref), in addition to the old and new values of the ref.
 991        A scripted Porcelain command can use set_reflog_action
 992        helper function in `git-sh-setup` to set its name to this
 993        variable when it is invoked as the top level command by the
 994        end user, to be recorded in the body of the reflog.
 995
 996
 997Discussion[[Discussion]]
 998------------------------
 999
1000More detail on the following is available from the
1001link:user-manual.html#git-concepts[Git concepts chapter of the
1002user-manual] and linkgit:gitcore-tutorial[7].
1003
1004A Git project normally consists of a working directory with a ".git"
1005subdirectory at the top level.  The .git directory contains, among other
1006things, a compressed object database representing the complete history
1007of the project, an "index" file which links that history to the current
1008contents of the working tree, and named pointers into that history such
1009as tags and branch heads.
1010
1011The object database contains objects of three main types: blobs, which
1012hold file data; trees, which point to blobs and other trees to build up
1013directory hierarchies; and commits, which each reference a single tree
1014and some number of parent commits.
1015
1016The commit, equivalent to what other systems call a "changeset" or
1017"version", represents a step in the project's history, and each parent
1018represents an immediately preceding step.  Commits with more than one
1019parent represent merges of independent lines of development.
1020
1021All objects are named by the SHA-1 hash of their contents, normally
1022written as a string of 40 hex digits.  Such names are globally unique.
1023The entire history leading up to a commit can be vouched for by signing
1024just that commit.  A fourth object type, the tag, is provided for this
1025purpose.
1026
1027When first created, objects are stored in individual files, but for
1028efficiency may later be compressed together into "pack files".
1029
1030Named pointers called refs mark interesting points in history.  A ref
1031may contain the SHA-1 name of an object or the name of another ref.  Refs
1032with names beginning `ref/head/` contain the SHA-1 name of the most
1033recent commit (or "head") of a branch under development.  SHA-1 names of
1034tags of interest are stored under `ref/tags/`.  A special ref named
1035`HEAD` contains the name of the currently checked-out branch.
1036
1037The index file is initialized with a list of all paths and, for each
1038path, a blob object and a set of attributes.  The blob object represents
1039the contents of the file as of the head of the current branch.  The
1040attributes (last modified time, size, etc.) are taken from the
1041corresponding file in the working tree.  Subsequent changes to the
1042working tree can be found by comparing these attributes.  The index may
1043be updated with new content, and new commits may be created from the
1044content stored in the index.
1045
1046The index is also capable of storing multiple entries (called "stages")
1047for a given pathname.  These stages are used to hold the various
1048unmerged version of a file when a merge is in progress.
1049
1050FURTHER DOCUMENTATION
1051---------------------
1052
1053See the references in the "description" section to get started
1054using Git.  The following is probably more detail than necessary
1055for a first-time user.
1056
1057The link:user-manual.html#git-concepts[Git concepts chapter of the
1058user-manual] and linkgit:gitcore-tutorial[7] both provide
1059introductions to the underlying Git architecture.
1060
1061See linkgit:gitworkflows[7] for an overview of recommended workflows.
1062
1063See also the link:howto-index.html[howto] documents for some useful
1064examples.
1065
1066The internals are documented in the
1067link:technical/api-index.html[Git API documentation].
1068
1069Users migrating from CVS may also want to
1070read linkgit:gitcvs-migration[7].
1071
1072
1073Authors
1074-------
1075Git was started by Linus Torvalds, and is currently maintained by Junio
1076C Hamano. Numerous contributions have come from the Git mailing list
1077<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1078gives you a more complete list of contributors.
1079
1080If you have a clone of git.git itself, the
1081output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1082the authors for specific parts of the project.
1083
1084Reporting Bugs
1085--------------
1086
1087Report bugs to the Git mailing list <git@vger.kernel.org> where the
1088development and maintenance is primarily done.  You do not have to be
1089subscribed to the list to send a message there.
1090
1091SEE ALSO
1092--------
1093linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1094link:everyday.html[Everyday Git], linkgit:gitcvs-migration[7],
1095linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1096linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1097linkgit:gitworkflows[7]
1098
1099GIT
1100---
1101Part of the linkgit:git[1] suite