Documentation / git.txton commit Merge branch 'maint-2.5' into maint-2.6 (ce4d4e7)
   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:v2.6.5/git.html[documentation for release 2.6.5]
  47
  48* release notes for
  49  link:RelNotes/2.6.5.txt[2.6.5],
  50  link:RelNotes/2.6.4.txt[2.6.4],
  51  link:RelNotes/2.6.3.txt[2.6.3],
  52  link:RelNotes/2.6.2.txt[2.6.2],
  53  link:RelNotes/2.6.1.txt[2.6.1],
  54  link:RelNotes/2.6.0.txt[2.6].
  55
  56* link:v2.5.5/git.html[documentation for release 2.5.5]
  57
  58* release notes for
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  60  link:RelNotes/2.5.4.txt[2.5.4],
  61  link:RelNotes/2.5.3.txt[2.5.3],
  62  link:RelNotes/2.5.2.txt[2.5.2],
  63  link:RelNotes/2.5.1.txt[2.5.1],
  64  link:RelNotes/2.5.0.txt[2.5].
  65
  66* link:v2.4.11/git.html[documentation for release 2.4.11]
  67
  68* release notes for
  69  link:RelNotes/2.4.11.txt[2.4.11],
  70  link:RelNotes/2.4.10.txt[2.4.10],
  71  link:RelNotes/2.4.9.txt[2.4.9],
  72  link:RelNotes/2.4.8.txt[2.4.8],
  73  link:RelNotes/2.4.7.txt[2.4.7],
  74  link:RelNotes/2.4.6.txt[2.4.6],
  75  link:RelNotes/2.4.5.txt[2.4.5],
  76  link:RelNotes/2.4.4.txt[2.4.4],
  77  link:RelNotes/2.4.3.txt[2.4.3],
  78  link:RelNotes/2.4.2.txt[2.4.2],
  79  link:RelNotes/2.4.1.txt[2.4.1],
  80  link:RelNotes/2.4.0.txt[2.4].
  81
  82* link:v2.3.10/git.html[documentation for release 2.3.10]
  83
  84* release notes for
  85  link:RelNotes/2.3.10.txt[2.3.10],
  86  link:RelNotes/2.3.9.txt[2.3.9],
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  91  link:RelNotes/2.3.4.txt[2.3.4],
  92  link:RelNotes/2.3.3.txt[2.3.3],
  93  link:RelNotes/2.3.2.txt[2.3.2],
  94  link:RelNotes/2.3.1.txt[2.3.1],
  95  link:RelNotes/2.3.0.txt[2.3].
  96
  97* link:v2.2.3/git.html[documentation for release 2.2.3]
  98
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 106
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 425  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 426  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 427  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 428  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 429  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 430  link:RelNotes/1.5.4.txt[1.5.4].
 431
 432* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 433
 434* release notes for
 435  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 436  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 437  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 438  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 439  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 440  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 441  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 442  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 443  link:RelNotes/1.5.3.txt[1.5.3].
 444
 445* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 446
 447* release notes for
 448  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 449  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 450  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 451  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 452  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 453  link:RelNotes/1.5.2.txt[1.5.2].
 454
 455* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 456
 457* release notes for
 458  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 459  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 460  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 461  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 462  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 463  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 464  link:RelNotes/1.5.1.txt[1.5.1].
 465
 466* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 467
 468* release notes for
 469  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 470  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 471  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 472  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 473  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 474  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 475  link:RelNotes/1.5.0.txt[1.5.0].
 476
 477* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 478  link:v1.3.3/git.html[1.3.3],
 479  link:v1.2.6/git.html[1.2.6],
 480  link:v1.0.13/git.html[1.0.13].
 481
 482============
 483
 484endif::stalenotes[]
 485
 486OPTIONS
 487-------
 488--version::
 489        Prints the Git suite version that the 'git' program came from.
 490
 491--help::
 492        Prints the synopsis and a list of the most commonly used
 493        commands. If the option '--all' or '-a' is given then all
 494        available commands are printed. If a Git command is named this
 495        option will bring up the manual page for that command.
 496+
 497Other options are available to control how the manual page is
 498displayed. See linkgit:git-help[1] for more information,
 499because `git --help ...` is converted internally into `git
 500help ...`.
 501
 502-C <path>::
 503        Run as if git was started in '<path>' instead of the current working
 504        directory.  When multiple `-C` options are given, each subsequent
 505        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 506        <path>`.
 507+
 508This option affects options that expect path name like `--git-dir` and
 509`--work-tree` in that their interpretations of the path names would be
 510made relative to the working directory caused by the `-C` option. For
 511example the following invocations are equivalent:
 512
 513    git --git-dir=a.git --work-tree=b -C c status
 514    git --git-dir=c/a.git --work-tree=c/b status
 515
 516-c <name>=<value>::
 517        Pass a configuration parameter to the command. The value
 518        given will override values from configuration files.
 519        The <name> is expected in the same format as listed by
 520        'git config' (subkeys separated by dots).
 521+
 522Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 523`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 524config file). Including the equals but with an empty value (like `git -c
 525foo.bar= ...`) sets `foo.bar` to the empty string.
 526
 527--exec-path[=<path>]::
 528        Path to wherever your core Git programs are installed.
 529        This can also be controlled by setting the GIT_EXEC_PATH
 530        environment variable. If no path is given, 'git' will print
 531        the current setting and then exit.
 532
 533--html-path::
 534        Print the path, without trailing slash, where Git's HTML
 535        documentation is installed and exit.
 536
 537--man-path::
 538        Print the manpath (see `man(1)`) for the man pages for
 539        this version of Git and exit.
 540
 541--info-path::
 542        Print the path where the Info files documenting this
 543        version of Git are installed and exit.
 544
 545-p::
 546--paginate::
 547        Pipe all output into 'less' (or if set, $PAGER) if standard
 548        output is a terminal.  This overrides the `pager.<cmd>`
 549        configuration options (see the "Configuration Mechanism" section
 550        below).
 551
 552--no-pager::
 553        Do not pipe Git output into a pager.
 554
 555--git-dir=<path>::
 556        Set the path to the repository. This can also be controlled by
 557        setting the GIT_DIR environment variable. It can be an absolute
 558        path or relative path to current working directory.
 559
 560--work-tree=<path>::
 561        Set the path to the working tree. It can be an absolute path
 562        or a path relative to the current working directory.
 563        This can also be controlled by setting the GIT_WORK_TREE
 564        environment variable and the core.worktree configuration
 565        variable (see core.worktree in linkgit:git-config[1] for a
 566        more detailed discussion).
 567
 568--namespace=<path>::
 569        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 570        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 571        variable.
 572
 573--bare::
 574        Treat the repository as a bare repository.  If GIT_DIR
 575        environment is not set, it is set to the current working
 576        directory.
 577
 578--no-replace-objects::
 579        Do not use replacement refs to replace Git objects. See
 580        linkgit:git-replace[1] for more information.
 581
 582--literal-pathspecs::
 583        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 584        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 585        variable to `1`.
 586
 587--glob-pathspecs::
 588        Add "glob" magic to all pathspec. This is equivalent to setting
 589        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 590        globbing on individual pathspecs can be done using pathspec
 591        magic ":(literal)"
 592
 593--noglob-pathspecs::
 594        Add "literal" magic to all pathspec. This is equivalent to setting
 595        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 596        globbing on individual pathspecs can be done using pathspec
 597        magic ":(glob)"
 598
 599--icase-pathspecs::
 600        Add "icase" magic to all pathspec. This is equivalent to setting
 601        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 602
 603GIT COMMANDS
 604------------
 605
 606We divide Git into high level ("porcelain") commands and low level
 607("plumbing") commands.
 608
 609High-level commands (porcelain)
 610-------------------------------
 611
 612We separate the porcelain commands into the main commands and some
 613ancillary user utilities.
 614
 615Main porcelain commands
 616~~~~~~~~~~~~~~~~~~~~~~~
 617
 618include::cmds-mainporcelain.txt[]
 619
 620Ancillary Commands
 621~~~~~~~~~~~~~~~~~~
 622Manipulators:
 623
 624include::cmds-ancillarymanipulators.txt[]
 625
 626Interrogators:
 627
 628include::cmds-ancillaryinterrogators.txt[]
 629
 630
 631Interacting with Others
 632~~~~~~~~~~~~~~~~~~~~~~~
 633
 634These commands are to interact with foreign SCM and with other
 635people via patch over e-mail.
 636
 637include::cmds-foreignscminterface.txt[]
 638
 639
 640Low-level commands (plumbing)
 641-----------------------------
 642
 643Although Git includes its
 644own porcelain layer, its low-level commands are sufficient to support
 645development of alternative porcelains.  Developers of such porcelains
 646might start by reading about linkgit:git-update-index[1] and
 647linkgit:git-read-tree[1].
 648
 649The interface (input, output, set of options and the semantics)
 650to these low-level commands are meant to be a lot more stable
 651than Porcelain level commands, because these commands are
 652primarily for scripted use.  The interface to Porcelain commands
 653on the other hand are subject to change in order to improve the
 654end user experience.
 655
 656The following description divides
 657the low-level commands into commands that manipulate objects (in
 658the repository, index, and working tree), commands that interrogate and
 659compare objects, and commands that move objects and references between
 660repositories.
 661
 662
 663Manipulation commands
 664~~~~~~~~~~~~~~~~~~~~~
 665
 666include::cmds-plumbingmanipulators.txt[]
 667
 668
 669Interrogation commands
 670~~~~~~~~~~~~~~~~~~~~~~
 671
 672include::cmds-plumbinginterrogators.txt[]
 673
 674In general, the interrogate commands do not touch the files in
 675the working tree.
 676
 677
 678Synching repositories
 679~~~~~~~~~~~~~~~~~~~~~
 680
 681include::cmds-synchingrepositories.txt[]
 682
 683The following are helper commands used by the above; end users
 684typically do not use them directly.
 685
 686include::cmds-synchelpers.txt[]
 687
 688
 689Internal helper commands
 690~~~~~~~~~~~~~~~~~~~~~~~~
 691
 692These are internal helper commands used by other commands; end
 693users typically do not use them directly.
 694
 695include::cmds-purehelpers.txt[]
 696
 697
 698Configuration Mechanism
 699-----------------------
 700
 701Git uses a simple text format to store customizations that are per
 702repository and are per user.  Such a configuration file may look
 703like this:
 704
 705------------
 706#
 707# A '#' or ';' character indicates a comment.
 708#
 709
 710; core variables
 711[core]
 712        ; Don't trust file modes
 713        filemode = false
 714
 715; user identity
 716[user]
 717        name = "Junio C Hamano"
 718        email = "gitster@pobox.com"
 719
 720------------
 721
 722Various commands read from the configuration file and adjust
 723their operation accordingly.  See linkgit:git-config[1] for a
 724list and more details about the configuration mechanism.
 725
 726
 727Identifier Terminology
 728----------------------
 729<object>::
 730        Indicates the object name for any type of object.
 731
 732<blob>::
 733        Indicates a blob object name.
 734
 735<tree>::
 736        Indicates a tree object name.
 737
 738<commit>::
 739        Indicates a commit object name.
 740
 741<tree-ish>::
 742        Indicates a tree, commit or tag object name.  A
 743        command that takes a <tree-ish> argument ultimately wants to
 744        operate on a <tree> object but automatically dereferences
 745        <commit> and <tag> objects that point at a <tree>.
 746
 747<commit-ish>::
 748        Indicates a commit or tag object name.  A
 749        command that takes a <commit-ish> argument ultimately wants to
 750        operate on a <commit> object but automatically dereferences
 751        <tag> objects that point at a <commit>.
 752
 753<type>::
 754        Indicates that an object type is required.
 755        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 756
 757<file>::
 758        Indicates a filename - almost always relative to the
 759        root of the tree structure `GIT_INDEX_FILE` describes.
 760
 761Symbolic Identifiers
 762--------------------
 763Any Git command accepting any <object> can also use the following
 764symbolic notation:
 765
 766HEAD::
 767        indicates the head of the current branch.
 768
 769<tag>::
 770        a valid tag 'name'
 771        (i.e. a `refs/tags/<tag>` reference).
 772
 773<head>::
 774        a valid head 'name'
 775        (i.e. a `refs/heads/<head>` reference).
 776
 777For a more complete list of ways to spell object names, see
 778"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 779
 780
 781File/Directory Structure
 782------------------------
 783
 784Please see the linkgit:gitrepository-layout[5] document.
 785
 786Read linkgit:githooks[5] for more details about each hook.
 787
 788Higher level SCMs may provide and manage additional information in the
 789`$GIT_DIR`.
 790
 791
 792Terminology
 793-----------
 794Please see linkgit:gitglossary[7].
 795
 796
 797Environment Variables
 798---------------------
 799Various Git commands use the following environment variables:
 800
 801The Git Repository
 802~~~~~~~~~~~~~~~~~~
 803These environment variables apply to 'all' core Git commands. Nb: it
 804is worth noting that they may be used/overridden by SCMS sitting above
 805Git so take care if using a foreign front-end.
 806
 807'GIT_INDEX_FILE'::
 808        This environment allows the specification of an alternate
 809        index file. If not specified, the default of `$GIT_DIR/index`
 810        is used.
 811
 812'GIT_INDEX_VERSION'::
 813        This environment variable allows the specification of an index
 814        version for new repositories.  It won't affect existing index
 815        files.  By default index file version 2 or 3 is used. See
 816        linkgit:git-update-index[1] for more information.
 817
 818'GIT_OBJECT_DIRECTORY'::
 819        If the object storage directory is specified via this
 820        environment variable then the sha1 directories are created
 821        underneath - otherwise the default `$GIT_DIR/objects`
 822        directory is used.
 823
 824'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 825        Due to the immutable nature of Git objects, old objects can be
 826        archived into shared, read-only directories. This variable
 827        specifies a ":" separated (on Windows ";" separated) list
 828        of Git object directories which can be used to search for Git
 829        objects. New objects will not be written to these directories.
 830
 831'GIT_DIR'::
 832        If the 'GIT_DIR' environment variable is set then it
 833        specifies a path to use instead of the default `.git`
 834        for the base of the repository.
 835        The '--git-dir' command-line option also sets this value.
 836
 837'GIT_WORK_TREE'::
 838        Set the path to the root of the working tree.
 839        This can also be controlled by the '--work-tree' command-line
 840        option and the core.worktree configuration variable.
 841
 842'GIT_NAMESPACE'::
 843        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 844        The '--namespace' command-line option also sets this value.
 845
 846'GIT_CEILING_DIRECTORIES'::
 847        This should be a colon-separated list of absolute paths.  If
 848        set, it is a list of directories that Git should not chdir up
 849        into while looking for a repository directory (useful for
 850        excluding slow-loading network directories).  It will not
 851        exclude the current working directory or a GIT_DIR set on the
 852        command line or in the environment.  Normally, Git has to read
 853        the entries in this list and resolve any symlink that
 854        might be present in order to compare them with the current
 855        directory.  However, if even this access is slow, you
 856        can add an empty entry to the list to tell Git that the
 857        subsequent entries are not symlinks and needn't be resolved;
 858        e.g.,
 859        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 860
 861'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 862        When run in a directory that does not have ".git" repository
 863        directory, Git tries to find such a directory in the parent
 864        directories to find the top of the working tree, but by default it
 865        does not cross filesystem boundaries.  This environment variable
 866        can be set to true to tell Git not to stop at filesystem
 867        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 868        an explicit repository directory set via 'GIT_DIR' or on the
 869        command line.
 870
 871'GIT_COMMON_DIR'::
 872        If this variable is set to a path, non-worktree files that are
 873        normally in $GIT_DIR will be taken from this path
 874        instead. Worktree-specific files such as HEAD or index are
 875        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 876        linkgit:git-worktree[1] for
 877        details. This variable has lower precedence than other path
 878        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 879
 880Git Commits
 881~~~~~~~~~~~
 882'GIT_AUTHOR_NAME'::
 883'GIT_AUTHOR_EMAIL'::
 884'GIT_AUTHOR_DATE'::
 885'GIT_COMMITTER_NAME'::
 886'GIT_COMMITTER_EMAIL'::
 887'GIT_COMMITTER_DATE'::
 888'EMAIL'::
 889        see linkgit:git-commit-tree[1]
 890
 891Git Diffs
 892~~~~~~~~~
 893'GIT_DIFF_OPTS'::
 894        Only valid setting is "--unified=??" or "-u??" to set the
 895        number of context lines shown when a unified diff is created.
 896        This takes precedence over any "-U" or "--unified" option
 897        value passed on the Git diff command line.
 898
 899'GIT_EXTERNAL_DIFF'::
 900        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 901        program named by it is called, instead of the diff invocation
 902        described above.  For a path that is added, removed, or modified,
 903        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 904
 905        path old-file old-hex old-mode new-file new-hex new-mode
 906+
 907where:
 908
 909        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 910                         contents of <old|new>,
 911        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 912        <old|new>-mode:: are the octal representation of the file modes.
 913+
 914The file parameters can point at the user's working file
 915(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 916when a new file is added), or a temporary file (e.g. `old-file` in the
 917index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 918temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 919+
 920For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 921parameter, <path>.
 922+
 923For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 924'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 925
 926'GIT_DIFF_PATH_COUNTER'::
 927        A 1-based counter incremented by one for every path.
 928
 929'GIT_DIFF_PATH_TOTAL'::
 930        The total number of paths.
 931
 932other
 933~~~~~
 934'GIT_MERGE_VERBOSITY'::
 935        A number controlling the amount of output shown by
 936        the recursive merge strategy.  Overrides merge.verbosity.
 937        See linkgit:git-merge[1]
 938
 939'GIT_PAGER'::
 940        This environment variable overrides `$PAGER`. If it is set
 941        to an empty string or to the value "cat", Git will not launch
 942        a pager.  See also the `core.pager` option in
 943        linkgit:git-config[1].
 944
 945'GIT_EDITOR'::
 946        This environment variable overrides `$EDITOR` and `$VISUAL`.
 947        It is used by several Git commands when, on interactive mode,
 948        an editor is to be launched. See also linkgit:git-var[1]
 949        and the `core.editor` option in linkgit:git-config[1].
 950
 951'GIT_SSH'::
 952'GIT_SSH_COMMAND'::
 953        If either of these environment variables is set then 'git fetch'
 954        and 'git push' will use the specified command instead of 'ssh'
 955        when they need to connect to a remote system.
 956        The command will be given exactly two or four arguments: the
 957        'username@host' (or just 'host') from the URL and the shell
 958        command to execute on that remote system, optionally preceded by
 959        '-p' (literally) and the 'port' from the URL when it specifies
 960        something other than the default SSH port.
 961+
 962`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 963by the shell, which allows additional arguments to be included.
 964`$GIT_SSH` on the other hand must be just the path to a program
 965(which can be a wrapper shell script, if additional arguments are
 966needed).
 967+
 968Usually it is easier to configure any desired options through your
 969personal `.ssh/config` file.  Please consult your ssh documentation
 970for further details.
 971
 972'GIT_ASKPASS'::
 973        If this environment variable is set, then Git commands which need to
 974        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 975        will call this program with a suitable prompt as command-line argument
 976        and read the password from its STDOUT. See also the 'core.askPass'
 977        option in linkgit:git-config[1].
 978
 979'GIT_TERMINAL_PROMPT'::
 980        If this environment variable is set to `0`, git will not prompt
 981        on the terminal (e.g., when asking for HTTP authentication).
 982
 983'GIT_CONFIG_NOSYSTEM'::
 984        Whether to skip reading settings from the system-wide
 985        `$(prefix)/etc/gitconfig` file.  This environment variable can
 986        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 987        predictable environment for a picky script, or you can set it
 988        temporarily to avoid using a buggy `/etc/gitconfig` file while
 989        waiting for someone with sufficient permissions to fix it.
 990
 991'GIT_FLUSH'::
 992        If this environment variable is set to "1", then commands such
 993        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 994        'git check-attr' and 'git check-ignore' will
 995        force a flush of the output stream after each record have been
 996        flushed. If this
 997        variable is set to "0", the output of these commands will be done
 998        using completely buffered I/O.   If this environment variable is
 999        not set, Git will choose buffered or record-oriented flushing
1000        based on whether stdout appears to be redirected to a file or not.
1001
1002'GIT_TRACE'::
1003        Enables general trace messages, e.g. alias expansion, built-in
1004        command execution and external command execution.
1005+
1006If this variable is set to "1", "2" or "true" (comparison
1007is case insensitive), trace messages will be printed to
1008stderr.
1009+
1010If the variable is set to an integer value greater than 2
1011and lower than 10 (strictly) then Git will interpret this
1012value as an open file descriptor and will try to write the
1013trace messages into this file descriptor.
1014+
1015Alternatively, if the variable is set to an absolute path
1016(starting with a '/' character), Git will interpret this
1017as a file path and will try to write the trace messages
1018into it.
1019+
1020Unsetting the variable, or setting it to empty, "0" or
1021"false" (case insensitive) disables trace messages.
1022
1023'GIT_TRACE_PACK_ACCESS'::
1024        Enables trace messages for all accesses to any packs. For each
1025        access, the pack file name and an offset in the pack is
1026        recorded. This may be helpful for troubleshooting some
1027        pack-related performance problems.
1028        See 'GIT_TRACE' for available trace output options.
1029
1030'GIT_TRACE_PACKET'::
1031        Enables trace messages for all packets coming in or out of a
1032        given program. This can help with debugging object negotiation
1033        or other protocol issues. Tracing is turned off at a packet
1034        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1035        See 'GIT_TRACE' for available trace output options.
1036
1037'GIT_TRACE_PACKFILE'::
1038        Enables tracing of packfiles sent or received by a
1039        given program. Unlike other trace output, this trace is
1040        verbatim: no headers, and no quoting of binary data. You almost
1041        certainly want to direct into a file (e.g.,
1042        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1043        the terminal or mixing it with other trace output.
1044+
1045Note that this is currently only implemented for the client side
1046of clones and fetches.
1047
1048'GIT_TRACE_PERFORMANCE'::
1049        Enables performance related trace messages, e.g. total execution
1050        time of each Git command.
1051        See 'GIT_TRACE' for available trace output options.
1052
1053'GIT_TRACE_SETUP'::
1054        Enables trace messages printing the .git, working tree and current
1055        working directory after Git has completed its setup phase.
1056        See 'GIT_TRACE' for available trace output options.
1057
1058'GIT_TRACE_SHALLOW'::
1059        Enables trace messages that can help debugging fetching /
1060        cloning of shallow repositories.
1061        See 'GIT_TRACE' for available trace output options.
1062
1063'GIT_LITERAL_PATHSPECS'::
1064        Setting this variable to `1` will cause Git to treat all
1065        pathspecs literally, rather than as glob patterns. For example,
1066        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1067        for commits that touch the path `*.c`, not any paths that the
1068        glob `*.c` matches. You might want this if you are feeding
1069        literal paths to Git (e.g., paths previously given to you by
1070        `git ls-tree`, `--raw` diff output, etc).
1071
1072'GIT_GLOB_PATHSPECS'::
1073        Setting this variable to `1` will cause Git to treat all
1074        pathspecs as glob patterns (aka "glob" magic).
1075
1076'GIT_NOGLOB_PATHSPECS'::
1077        Setting this variable to `1` will cause Git to treat all
1078        pathspecs as literal (aka "literal" magic).
1079
1080'GIT_ICASE_PATHSPECS'::
1081        Setting this variable to `1` will cause Git to treat all
1082        pathspecs as case-insensitive.
1083
1084'GIT_REFLOG_ACTION'::
1085        When a ref is updated, reflog entries are created to keep
1086        track of the reason why the ref was updated (which is
1087        typically the name of the high-level command that updated
1088        the ref), in addition to the old and new values of the ref.
1089        A scripted Porcelain command can use set_reflog_action
1090        helper function in `git-sh-setup` to set its name to this
1091        variable when it is invoked as the top level command by the
1092        end user, to be recorded in the body of the reflog.
1093
1094'GIT_REF_PARANOIA'::
1095        If set to `1`, include broken or badly named refs when iterating
1096        over lists of refs. In a normal, non-corrupted repository, this
1097        does nothing. However, enabling it may help git to detect and
1098        abort some operations in the presence of broken refs. Git sets
1099        this variable automatically when performing destructive
1100        operations like linkgit:git-prune[1]. You should not need to set
1101        it yourself unless you want to be paranoid about making sure
1102        an operation has touched every ref (e.g., because you are
1103        cloning a repository to make a backup).
1104
1105'GIT_ALLOW_PROTOCOL'::
1106        If set, provide a colon-separated list of protocols which are
1107        allowed to be used with fetch/push/clone. This is useful to
1108        restrict recursive submodule initialization from an untrusted
1109        repository. Any protocol not mentioned will be disallowed (i.e.,
1110        this is a whitelist, not a blacklist). If the variable is not
1111        set at all, all protocols are enabled.  The protocol names
1112        currently used by git are:
1113
1114          - `file`: any local file-based path (including `file://` URLs,
1115            or local paths)
1116
1117          - `git`: the anonymous git protocol over a direct TCP
1118            connection (or proxy, if configured)
1119
1120          - `ssh`: git over ssh (including `host:path` syntax,
1121            `git+ssh://`, etc).
1122
1123          - `rsync`: git over rsync
1124
1125          - `http`: git over http, both "smart http" and "dumb http".
1126            Note that this does _not_ include `https`; if you want both,
1127            you should specify both as `http:https`.
1128
1129          - any external helpers are named by their protocol (e.g., use
1130            `hg` to allow the `git-remote-hg` helper)
1131
1132
1133Discussion[[Discussion]]
1134------------------------
1135
1136More detail on the following is available from the
1137link:user-manual.html#git-concepts[Git concepts chapter of the
1138user-manual] and linkgit:gitcore-tutorial[7].
1139
1140A Git project normally consists of a working directory with a ".git"
1141subdirectory at the top level.  The .git directory contains, among other
1142things, a compressed object database representing the complete history
1143of the project, an "index" file which links that history to the current
1144contents of the working tree, and named pointers into that history such
1145as tags and branch heads.
1146
1147The object database contains objects of three main types: blobs, which
1148hold file data; trees, which point to blobs and other trees to build up
1149directory hierarchies; and commits, which each reference a single tree
1150and some number of parent commits.
1151
1152The commit, equivalent to what other systems call a "changeset" or
1153"version", represents a step in the project's history, and each parent
1154represents an immediately preceding step.  Commits with more than one
1155parent represent merges of independent lines of development.
1156
1157All objects are named by the SHA-1 hash of their contents, normally
1158written as a string of 40 hex digits.  Such names are globally unique.
1159The entire history leading up to a commit can be vouched for by signing
1160just that commit.  A fourth object type, the tag, is provided for this
1161purpose.
1162
1163When first created, objects are stored in individual files, but for
1164efficiency may later be compressed together into "pack files".
1165
1166Named pointers called refs mark interesting points in history.  A ref
1167may contain the SHA-1 name of an object or the name of another ref.  Refs
1168with names beginning `ref/head/` contain the SHA-1 name of the most
1169recent commit (or "head") of a branch under development.  SHA-1 names of
1170tags of interest are stored under `ref/tags/`.  A special ref named
1171`HEAD` contains the name of the currently checked-out branch.
1172
1173The index file is initialized with a list of all paths and, for each
1174path, a blob object and a set of attributes.  The blob object represents
1175the contents of the file as of the head of the current branch.  The
1176attributes (last modified time, size, etc.) are taken from the
1177corresponding file in the working tree.  Subsequent changes to the
1178working tree can be found by comparing these attributes.  The index may
1179be updated with new content, and new commits may be created from the
1180content stored in the index.
1181
1182The index is also capable of storing multiple entries (called "stages")
1183for a given pathname.  These stages are used to hold the various
1184unmerged version of a file when a merge is in progress.
1185
1186FURTHER DOCUMENTATION
1187---------------------
1188
1189See the references in the "description" section to get started
1190using Git.  The following is probably more detail than necessary
1191for a first-time user.
1192
1193The link:user-manual.html#git-concepts[Git concepts chapter of the
1194user-manual] and linkgit:gitcore-tutorial[7] both provide
1195introductions to the underlying Git architecture.
1196
1197See linkgit:gitworkflows[7] for an overview of recommended workflows.
1198
1199See also the link:howto-index.html[howto] documents for some useful
1200examples.
1201
1202The internals are documented in the
1203link:technical/api-index.html[Git API documentation].
1204
1205Users migrating from CVS may also want to
1206read linkgit:gitcvs-migration[7].
1207
1208
1209Authors
1210-------
1211Git was started by Linus Torvalds, and is currently maintained by Junio
1212C Hamano. Numerous contributions have come from the Git mailing list
1213<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1214gives you a more complete list of contributors.
1215
1216If you have a clone of git.git itself, the
1217output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1218the authors for specific parts of the project.
1219
1220Reporting Bugs
1221--------------
1222
1223Report bugs to the Git mailing list <git@vger.kernel.org> where the
1224development and maintenance is primarily done.  You do not have to be
1225subscribed to the list to send a message there.
1226
1227SEE ALSO
1228--------
1229linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1230linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1231linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1232linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1233linkgit:gitworkflows[7]
1234
1235GIT
1236---
1237Part of the linkgit:git[1] suite