Documentation / git.txton commit Merge branch 'jk/pack-objects-optim' (7884962)
   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
  34A formatted and hyperlinked copy of the latest Git documentation
  35can be viewed at `https://git.github.io/htmldocs/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:v2.9.2/git.html[documentation for release 2.9.2]
  47
  48* release notes for
  49  link:RelNotes/2.9.2.txt[2.9.2],
  50  link:RelNotes/2.9.1.txt[2.9.1],
  51  link:RelNotes/2.9.0.txt[2.9].
  52
  53* link:v2.8.4/git.html[documentation for release 2.8.4]
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  55* release notes for
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  57  link:RelNotes/2.8.3.txt[2.8.3],
  58  link:RelNotes/2.8.2.txt[2.8.2],
  59  link:RelNotes/2.8.1.txt[2.8.1],
  60  link:RelNotes/2.8.0.txt[2.8].
  61
  62* link:v2.7.3/git.html[documentation for release 2.7.3]
  63
  64* release notes for
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  66  link:RelNotes/2.7.2.txt[2.7.2],
  67  link:RelNotes/2.7.1.txt[2.7.1],
  68  link:RelNotes/2.7.0.txt[2.7].
  69
  70* link:v2.6.6/git.html[documentation for release 2.6.6]
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  78  link:RelNotes/2.6.1.txt[2.6.1],
  79  link:RelNotes/2.6.0.txt[2.6].
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  82
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 430  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 431  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 432  link:RelNotes/1.5.6.txt[1.5.6].
 433
 434* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 435
 436* release notes for
 437  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 438  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 439  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 440  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 441  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 442  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 443  link:RelNotes/1.5.5.txt[1.5.5].
 444
 445* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 446
 447* release notes for
 448  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 449  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 450  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 451  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 452  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 453  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 454  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 455  link:RelNotes/1.5.4.txt[1.5.4].
 456
 457* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 458
 459* release notes for
 460  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 461  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 462  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 463  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 464  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 465  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 466  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 467  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 468  link:RelNotes/1.5.3.txt[1.5.3].
 469
 470* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 471
 472* release notes for
 473  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 474  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 475  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 476  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 477  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 478  link:RelNotes/1.5.2.txt[1.5.2].
 479
 480* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 481
 482* release notes for
 483  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 484  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 485  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 486  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 487  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 488  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 489  link:RelNotes/1.5.1.txt[1.5.1].
 490
 491* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 492
 493* release notes for
 494  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 495  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 496  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 497  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 498  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 499  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 500  link:RelNotes/1.5.0.txt[1.5.0].
 501
 502* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 503  link:v1.3.3/git.html[1.3.3],
 504  link:v1.2.6/git.html[1.2.6],
 505  link:v1.0.13/git.html[1.0.13].
 506
 507============
 508
 509endif::stalenotes[]
 510
 511OPTIONS
 512-------
 513--version::
 514        Prints the Git suite version that the 'git' program came from.
 515
 516--help::
 517        Prints the synopsis and a list of the most commonly used
 518        commands. If the option `--all` or `-a` is given then all
 519        available commands are printed. If a Git command is named this
 520        option will bring up the manual page for that command.
 521+
 522Other options are available to control how the manual page is
 523displayed. See linkgit:git-help[1] for more information,
 524because `git --help ...` is converted internally into `git
 525help ...`.
 526
 527-C <path>::
 528        Run as if git was started in '<path>' instead of the current working
 529        directory.  When multiple `-C` options are given, each subsequent
 530        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 531        <path>`.
 532+
 533This option affects options that expect path name like `--git-dir` and
 534`--work-tree` in that their interpretations of the path names would be
 535made relative to the working directory caused by the `-C` option. For
 536example the following invocations are equivalent:
 537
 538    git --git-dir=a.git --work-tree=b -C c status
 539    git --git-dir=c/a.git --work-tree=c/b status
 540
 541-c <name>=<value>::
 542        Pass a configuration parameter to the command. The value
 543        given will override values from configuration files.
 544        The <name> is expected in the same format as listed by
 545        'git config' (subkeys separated by dots).
 546+
 547Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 548`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 549config file). Including the equals but with an empty value (like `git -c
 550foo.bar= ...`) sets `foo.bar` to the empty string.
 551
 552--exec-path[=<path>]::
 553        Path to wherever your core Git programs are installed.
 554        This can also be controlled by setting the GIT_EXEC_PATH
 555        environment variable. If no path is given, 'git' will print
 556        the current setting and then exit.
 557
 558--html-path::
 559        Print the path, without trailing slash, where Git's HTML
 560        documentation is installed and exit.
 561
 562--man-path::
 563        Print the manpath (see `man(1)`) for the man pages for
 564        this version of Git and exit.
 565
 566--info-path::
 567        Print the path where the Info files documenting this
 568        version of Git are installed and exit.
 569
 570-p::
 571--paginate::
 572        Pipe all output into 'less' (or if set, $PAGER) if standard
 573        output is a terminal.  This overrides the `pager.<cmd>`
 574        configuration options (see the "Configuration Mechanism" section
 575        below).
 576
 577--no-pager::
 578        Do not pipe Git output into a pager.
 579
 580--git-dir=<path>::
 581        Set the path to the repository. This can also be controlled by
 582        setting the `GIT_DIR` environment variable. It can be an absolute
 583        path or relative path to current working directory.
 584
 585--work-tree=<path>::
 586        Set the path to the working tree. It can be an absolute path
 587        or a path relative to the current working directory.
 588        This can also be controlled by setting the GIT_WORK_TREE
 589        environment variable and the core.worktree configuration
 590        variable (see core.worktree in linkgit:git-config[1] for a
 591        more detailed discussion).
 592
 593--namespace=<path>::
 594        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 595        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 596        variable.
 597
 598--bare::
 599        Treat the repository as a bare repository.  If GIT_DIR
 600        environment is not set, it is set to the current working
 601        directory.
 602
 603--no-replace-objects::
 604        Do not use replacement refs to replace Git objects. See
 605        linkgit:git-replace[1] for more information.
 606
 607--literal-pathspecs::
 608        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 609        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 610        variable to `1`.
 611
 612--glob-pathspecs::
 613        Add "glob" magic to all pathspec. This is equivalent to setting
 614        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 615        globbing on individual pathspecs can be done using pathspec
 616        magic ":(literal)"
 617
 618--noglob-pathspecs::
 619        Add "literal" magic to all pathspec. This is equivalent to setting
 620        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 621        globbing on individual pathspecs can be done using pathspec
 622        magic ":(glob)"
 623
 624--icase-pathspecs::
 625        Add "icase" magic to all pathspec. This is equivalent to setting
 626        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 627
 628GIT COMMANDS
 629------------
 630
 631We divide Git into high level ("porcelain") commands and low level
 632("plumbing") commands.
 633
 634High-level commands (porcelain)
 635-------------------------------
 636
 637We separate the porcelain commands into the main commands and some
 638ancillary user utilities.
 639
 640Main porcelain commands
 641~~~~~~~~~~~~~~~~~~~~~~~
 642
 643include::cmds-mainporcelain.txt[]
 644
 645Ancillary Commands
 646~~~~~~~~~~~~~~~~~~
 647Manipulators:
 648
 649include::cmds-ancillarymanipulators.txt[]
 650
 651Interrogators:
 652
 653include::cmds-ancillaryinterrogators.txt[]
 654
 655
 656Interacting with Others
 657~~~~~~~~~~~~~~~~~~~~~~~
 658
 659These commands are to interact with foreign SCM and with other
 660people via patch over e-mail.
 661
 662include::cmds-foreignscminterface.txt[]
 663
 664
 665Low-level commands (plumbing)
 666-----------------------------
 667
 668Although Git includes its
 669own porcelain layer, its low-level commands are sufficient to support
 670development of alternative porcelains.  Developers of such porcelains
 671might start by reading about linkgit:git-update-index[1] and
 672linkgit:git-read-tree[1].
 673
 674The interface (input, output, set of options and the semantics)
 675to these low-level commands are meant to be a lot more stable
 676than Porcelain level commands, because these commands are
 677primarily for scripted use.  The interface to Porcelain commands
 678on the other hand are subject to change in order to improve the
 679end user experience.
 680
 681The following description divides
 682the low-level commands into commands that manipulate objects (in
 683the repository, index, and working tree), commands that interrogate and
 684compare objects, and commands that move objects and references between
 685repositories.
 686
 687
 688Manipulation commands
 689~~~~~~~~~~~~~~~~~~~~~
 690
 691include::cmds-plumbingmanipulators.txt[]
 692
 693
 694Interrogation commands
 695~~~~~~~~~~~~~~~~~~~~~~
 696
 697include::cmds-plumbinginterrogators.txt[]
 698
 699In general, the interrogate commands do not touch the files in
 700the working tree.
 701
 702
 703Synching repositories
 704~~~~~~~~~~~~~~~~~~~~~
 705
 706include::cmds-synchingrepositories.txt[]
 707
 708The following are helper commands used by the above; end users
 709typically do not use them directly.
 710
 711include::cmds-synchelpers.txt[]
 712
 713
 714Internal helper commands
 715~~~~~~~~~~~~~~~~~~~~~~~~
 716
 717These are internal helper commands used by other commands; end
 718users typically do not use them directly.
 719
 720include::cmds-purehelpers.txt[]
 721
 722
 723Configuration Mechanism
 724-----------------------
 725
 726Git uses a simple text format to store customizations that are per
 727repository and are per user.  Such a configuration file may look
 728like this:
 729
 730------------
 731#
 732# A '#' or ';' character indicates a comment.
 733#
 734
 735; core variables
 736[core]
 737        ; Don't trust file modes
 738        filemode = false
 739
 740; user identity
 741[user]
 742        name = "Junio C Hamano"
 743        email = "gitster@pobox.com"
 744
 745------------
 746
 747Various commands read from the configuration file and adjust
 748their operation accordingly.  See linkgit:git-config[1] for a
 749list and more details about the configuration mechanism.
 750
 751
 752Identifier Terminology
 753----------------------
 754<object>::
 755        Indicates the object name for any type of object.
 756
 757<blob>::
 758        Indicates a blob object name.
 759
 760<tree>::
 761        Indicates a tree object name.
 762
 763<commit>::
 764        Indicates a commit object name.
 765
 766<tree-ish>::
 767        Indicates a tree, commit or tag object name.  A
 768        command that takes a <tree-ish> argument ultimately wants to
 769        operate on a <tree> object but automatically dereferences
 770        <commit> and <tag> objects that point at a <tree>.
 771
 772<commit-ish>::
 773        Indicates a commit or tag object name.  A
 774        command that takes a <commit-ish> argument ultimately wants to
 775        operate on a <commit> object but automatically dereferences
 776        <tag> objects that point at a <commit>.
 777
 778<type>::
 779        Indicates that an object type is required.
 780        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 781
 782<file>::
 783        Indicates a filename - almost always relative to the
 784        root of the tree structure `GIT_INDEX_FILE` describes.
 785
 786Symbolic Identifiers
 787--------------------
 788Any Git command accepting any <object> can also use the following
 789symbolic notation:
 790
 791HEAD::
 792        indicates the head of the current branch.
 793
 794<tag>::
 795        a valid tag 'name'
 796        (i.e. a `refs/tags/<tag>` reference).
 797
 798<head>::
 799        a valid head 'name'
 800        (i.e. a `refs/heads/<head>` reference).
 801
 802For a more complete list of ways to spell object names, see
 803"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 804
 805
 806File/Directory Structure
 807------------------------
 808
 809Please see the linkgit:gitrepository-layout[5] document.
 810
 811Read linkgit:githooks[5] for more details about each hook.
 812
 813Higher level SCMs may provide and manage additional information in the
 814`$GIT_DIR`.
 815
 816
 817Terminology
 818-----------
 819Please see linkgit:gitglossary[7].
 820
 821
 822Environment Variables
 823---------------------
 824Various Git commands use the following environment variables:
 825
 826The Git Repository
 827~~~~~~~~~~~~~~~~~~
 828These environment variables apply to 'all' core Git commands. Nb: it
 829is worth noting that they may be used/overridden by SCMS sitting above
 830Git so take care if using a foreign front-end.
 831
 832`GIT_INDEX_FILE`::
 833        This environment allows the specification of an alternate
 834        index file. If not specified, the default of `$GIT_DIR/index`
 835        is used.
 836
 837`GIT_INDEX_VERSION`::
 838        This environment variable allows the specification of an index
 839        version for new repositories.  It won't affect existing index
 840        files.  By default index file version 2 or 3 is used. See
 841        linkgit:git-update-index[1] for more information.
 842
 843`GIT_OBJECT_DIRECTORY`::
 844        If the object storage directory is specified via this
 845        environment variable then the sha1 directories are created
 846        underneath - otherwise the default `$GIT_DIR/objects`
 847        directory is used.
 848
 849`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 850        Due to the immutable nature of Git objects, old objects can be
 851        archived into shared, read-only directories. This variable
 852        specifies a ":" separated (on Windows ";" separated) list
 853        of Git object directories which can be used to search for Git
 854        objects. New objects will not be written to these directories.
 855
 856`GIT_DIR`::
 857        If the `GIT_DIR` environment variable is set then it
 858        specifies a path to use instead of the default `.git`
 859        for the base of the repository.
 860        The `--git-dir` command-line option also sets this value.
 861
 862`GIT_WORK_TREE`::
 863        Set the path to the root of the working tree.
 864        This can also be controlled by the `--work-tree` command-line
 865        option and the core.worktree configuration variable.
 866
 867`GIT_NAMESPACE`::
 868        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 869        The `--namespace` command-line option also sets this value.
 870
 871`GIT_CEILING_DIRECTORIES`::
 872        This should be a colon-separated list of absolute paths.  If
 873        set, it is a list of directories that Git should not chdir up
 874        into while looking for a repository directory (useful for
 875        excluding slow-loading network directories).  It will not
 876        exclude the current working directory or a GIT_DIR set on the
 877        command line or in the environment.  Normally, Git has to read
 878        the entries in this list and resolve any symlink that
 879        might be present in order to compare them with the current
 880        directory.  However, if even this access is slow, you
 881        can add an empty entry to the list to tell Git that the
 882        subsequent entries are not symlinks and needn't be resolved;
 883        e.g.,
 884        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 885
 886`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 887        When run in a directory that does not have ".git" repository
 888        directory, Git tries to find such a directory in the parent
 889        directories to find the top of the working tree, but by default it
 890        does not cross filesystem boundaries.  This environment variable
 891        can be set to true to tell Git not to stop at filesystem
 892        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 893        an explicit repository directory set via `GIT_DIR` or on the
 894        command line.
 895
 896`GIT_COMMON_DIR`::
 897        If this variable is set to a path, non-worktree files that are
 898        normally in $GIT_DIR will be taken from this path
 899        instead. Worktree-specific files such as HEAD or index are
 900        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 901        linkgit:git-worktree[1] for
 902        details. This variable has lower precedence than other path
 903        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 904
 905Git Commits
 906~~~~~~~~~~~
 907`GIT_AUTHOR_NAME`::
 908`GIT_AUTHOR_EMAIL`::
 909`GIT_AUTHOR_DATE`::
 910`GIT_COMMITTER_NAME`::
 911`GIT_COMMITTER_EMAIL`::
 912`GIT_COMMITTER_DATE`::
 913'EMAIL'::
 914        see linkgit:git-commit-tree[1]
 915
 916Git Diffs
 917~~~~~~~~~
 918`GIT_DIFF_OPTS`::
 919        Only valid setting is "--unified=??" or "-u??" to set the
 920        number of context lines shown when a unified diff is created.
 921        This takes precedence over any "-U" or "--unified" option
 922        value passed on the Git diff command line.
 923
 924`GIT_EXTERNAL_DIFF`::
 925        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 926        program named by it is called, instead of the diff invocation
 927        described above.  For a path that is added, removed, or modified,
 928        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 929
 930        path old-file old-hex old-mode new-file new-hex new-mode
 931+
 932where:
 933
 934        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 935                         contents of <old|new>,
 936        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 937        <old|new>-mode:: are the octal representation of the file modes.
 938+
 939The file parameters can point at the user's working file
 940(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 941when a new file is added), or a temporary file (e.g. `old-file` in the
 942index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 943temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 944+
 945For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 946parameter, <path>.
 947+
 948For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 949`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 950
 951`GIT_DIFF_PATH_COUNTER`::
 952        A 1-based counter incremented by one for every path.
 953
 954`GIT_DIFF_PATH_TOTAL`::
 955        The total number of paths.
 956
 957other
 958~~~~~
 959`GIT_MERGE_VERBOSITY`::
 960        A number controlling the amount of output shown by
 961        the recursive merge strategy.  Overrides merge.verbosity.
 962        See linkgit:git-merge[1]
 963
 964`GIT_PAGER`::
 965        This environment variable overrides `$PAGER`. If it is set
 966        to an empty string or to the value "cat", Git will not launch
 967        a pager.  See also the `core.pager` option in
 968        linkgit:git-config[1].
 969
 970`GIT_EDITOR`::
 971        This environment variable overrides `$EDITOR` and `$VISUAL`.
 972        It is used by several Git commands when, on interactive mode,
 973        an editor is to be launched. See also linkgit:git-var[1]
 974        and the `core.editor` option in linkgit:git-config[1].
 975
 976`GIT_SSH`::
 977`GIT_SSH_COMMAND`::
 978        If either of these environment variables is set then 'git fetch'
 979        and 'git push' will use the specified command instead of 'ssh'
 980        when they need to connect to a remote system.
 981        The command will be given exactly two or four arguments: the
 982        'username@host' (or just 'host') from the URL and the shell
 983        command to execute on that remote system, optionally preceded by
 984        `-p` (literally) and the 'port' from the URL when it specifies
 985        something other than the default SSH port.
 986+
 987`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 988by the shell, which allows additional arguments to be included.
 989`$GIT_SSH` on the other hand must be just the path to a program
 990(which can be a wrapper shell script, if additional arguments are
 991needed).
 992+
 993Usually it is easier to configure any desired options through your
 994personal `.ssh/config` file.  Please consult your ssh documentation
 995for further details.
 996
 997`GIT_ASKPASS`::
 998        If this environment variable is set, then Git commands which need to
 999        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1000        will call this program with a suitable prompt as command-line argument
1001        and read the password from its STDOUT. See also the `core.askPass`
1002        option in linkgit:git-config[1].
1003
1004`GIT_TERMINAL_PROMPT`::
1005        If this environment variable is set to `0`, git will not prompt
1006        on the terminal (e.g., when asking for HTTP authentication).
1007
1008`GIT_CONFIG_NOSYSTEM`::
1009        Whether to skip reading settings from the system-wide
1010        `$(prefix)/etc/gitconfig` file.  This environment variable can
1011        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1012        predictable environment for a picky script, or you can set it
1013        temporarily to avoid using a buggy `/etc/gitconfig` file while
1014        waiting for someone with sufficient permissions to fix it.
1015
1016`GIT_FLUSH`::
1017        If this environment variable is set to "1", then commands such
1018        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1019        'git check-attr' and 'git check-ignore' will
1020        force a flush of the output stream after each record have been
1021        flushed. If this
1022        variable is set to "0", the output of these commands will be done
1023        using completely buffered I/O.   If this environment variable is
1024        not set, Git will choose buffered or record-oriented flushing
1025        based on whether stdout appears to be redirected to a file or not.
1026
1027`GIT_TRACE`::
1028        Enables general trace messages, e.g. alias expansion, built-in
1029        command execution and external command execution.
1030+
1031If this variable is set to "1", "2" or "true" (comparison
1032is case insensitive), trace messages will be printed to
1033stderr.
1034+
1035If the variable is set to an integer value greater than 2
1036and lower than 10 (strictly) then Git will interpret this
1037value as an open file descriptor and will try to write the
1038trace messages into this file descriptor.
1039+
1040Alternatively, if the variable is set to an absolute path
1041(starting with a '/' character), Git will interpret this
1042as a file path and will try to write the trace messages
1043into it.
1044+
1045Unsetting the variable, or setting it to empty, "0" or
1046"false" (case insensitive) disables trace messages.
1047
1048`GIT_TRACE_PACK_ACCESS`::
1049        Enables trace messages for all accesses to any packs. For each
1050        access, the pack file name and an offset in the pack is
1051        recorded. This may be helpful for troubleshooting some
1052        pack-related performance problems.
1053        See `GIT_TRACE` for available trace output options.
1054
1055`GIT_TRACE_PACKET`::
1056        Enables trace messages for all packets coming in or out of a
1057        given program. This can help with debugging object negotiation
1058        or other protocol issues. Tracing is turned off at a packet
1059        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1060        See `GIT_TRACE` for available trace output options.
1061
1062`GIT_TRACE_PACKFILE`::
1063        Enables tracing of packfiles sent or received by a
1064        given program. Unlike other trace output, this trace is
1065        verbatim: no headers, and no quoting of binary data. You almost
1066        certainly want to direct into a file (e.g.,
1067        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1068        the terminal or mixing it with other trace output.
1069+
1070Note that this is currently only implemented for the client side
1071of clones and fetches.
1072
1073`GIT_TRACE_PERFORMANCE`::
1074        Enables performance related trace messages, e.g. total execution
1075        time of each Git command.
1076        See `GIT_TRACE` for available trace output options.
1077
1078`GIT_TRACE_SETUP`::
1079        Enables trace messages printing the .git, working tree and current
1080        working directory after Git has completed its setup phase.
1081        See `GIT_TRACE` for available trace output options.
1082
1083`GIT_TRACE_SHALLOW`::
1084        Enables trace messages that can help debugging fetching /
1085        cloning of shallow repositories.
1086        See `GIT_TRACE` for available trace output options.
1087
1088`GIT_TRACE_CURL`::
1089        Enables a curl full trace dump of all incoming and outgoing data,
1090        including descriptive information, of the git transport protocol.
1091        This is similar to doing curl `--trace-ascii` on the command line.
1092        This option overrides setting the `GIT_CURL_VERBOSE` environment
1093        variable.
1094        See `GIT_TRACE` for available trace output options.
1095
1096`GIT_LITERAL_PATHSPECS`::
1097        Setting this variable to `1` will cause Git to treat all
1098        pathspecs literally, rather than as glob patterns. For example,
1099        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1100        for commits that touch the path `*.c`, not any paths that the
1101        glob `*.c` matches. You might want this if you are feeding
1102        literal paths to Git (e.g., paths previously given to you by
1103        `git ls-tree`, `--raw` diff output, etc).
1104
1105`GIT_GLOB_PATHSPECS`::
1106        Setting this variable to `1` will cause Git to treat all
1107        pathspecs as glob patterns (aka "glob" magic).
1108
1109`GIT_NOGLOB_PATHSPECS`::
1110        Setting this variable to `1` will cause Git to treat all
1111        pathspecs as literal (aka "literal" magic).
1112
1113`GIT_ICASE_PATHSPECS`::
1114        Setting this variable to `1` will cause Git to treat all
1115        pathspecs as case-insensitive.
1116
1117`GIT_REFLOG_ACTION`::
1118        When a ref is updated, reflog entries are created to keep
1119        track of the reason why the ref was updated (which is
1120        typically the name of the high-level command that updated
1121        the ref), in addition to the old and new values of the ref.
1122        A scripted Porcelain command can use set_reflog_action
1123        helper function in `git-sh-setup` to set its name to this
1124        variable when it is invoked as the top level command by the
1125        end user, to be recorded in the body of the reflog.
1126
1127`GIT_REF_PARANOIA`::
1128        If set to `1`, include broken or badly named refs when iterating
1129        over lists of refs. In a normal, non-corrupted repository, this
1130        does nothing. However, enabling it may help git to detect and
1131        abort some operations in the presence of broken refs. Git sets
1132        this variable automatically when performing destructive
1133        operations like linkgit:git-prune[1]. You should not need to set
1134        it yourself unless you want to be paranoid about making sure
1135        an operation has touched every ref (e.g., because you are
1136        cloning a repository to make a backup).
1137
1138`GIT_ALLOW_PROTOCOL`::
1139        If set, provide a colon-separated list of protocols which are
1140        allowed to be used with fetch/push/clone. This is useful to
1141        restrict recursive submodule initialization from an untrusted
1142        repository. Any protocol not mentioned will be disallowed (i.e.,
1143        this is a whitelist, not a blacklist). If the variable is not
1144        set at all, all protocols are enabled.  The protocol names
1145        currently used by git are:
1146
1147          - `file`: any local file-based path (including `file://` URLs,
1148            or local paths)
1149
1150          - `git`: the anonymous git protocol over a direct TCP
1151            connection (or proxy, if configured)
1152
1153          - `ssh`: git over ssh (including `host:path` syntax,
1154            `ssh://`, etc).
1155
1156          - `http`: git over http, both "smart http" and "dumb http".
1157            Note that this does _not_ include `https`; if you want both,
1158            you should specify both as `http:https`.
1159
1160          - any external helpers are named by their protocol (e.g., use
1161            `hg` to allow the `git-remote-hg` helper)
1162
1163
1164Discussion[[Discussion]]
1165------------------------
1166
1167More detail on the following is available from the
1168link:user-manual.html#git-concepts[Git concepts chapter of the
1169user-manual] and linkgit:gitcore-tutorial[7].
1170
1171A Git project normally consists of a working directory with a ".git"
1172subdirectory at the top level.  The .git directory contains, among other
1173things, a compressed object database representing the complete history
1174of the project, an "index" file which links that history to the current
1175contents of the working tree, and named pointers into that history such
1176as tags and branch heads.
1177
1178The object database contains objects of three main types: blobs, which
1179hold file data; trees, which point to blobs and other trees to build up
1180directory hierarchies; and commits, which each reference a single tree
1181and some number of parent commits.
1182
1183The commit, equivalent to what other systems call a "changeset" or
1184"version", represents a step in the project's history, and each parent
1185represents an immediately preceding step.  Commits with more than one
1186parent represent merges of independent lines of development.
1187
1188All objects are named by the SHA-1 hash of their contents, normally
1189written as a string of 40 hex digits.  Such names are globally unique.
1190The entire history leading up to a commit can be vouched for by signing
1191just that commit.  A fourth object type, the tag, is provided for this
1192purpose.
1193
1194When first created, objects are stored in individual files, but for
1195efficiency may later be compressed together into "pack files".
1196
1197Named pointers called refs mark interesting points in history.  A ref
1198may contain the SHA-1 name of an object or the name of another ref.  Refs
1199with names beginning `ref/head/` contain the SHA-1 name of the most
1200recent commit (or "head") of a branch under development.  SHA-1 names of
1201tags of interest are stored under `ref/tags/`.  A special ref named
1202`HEAD` contains the name of the currently checked-out branch.
1203
1204The index file is initialized with a list of all paths and, for each
1205path, a blob object and a set of attributes.  The blob object represents
1206the contents of the file as of the head of the current branch.  The
1207attributes (last modified time, size, etc.) are taken from the
1208corresponding file in the working tree.  Subsequent changes to the
1209working tree can be found by comparing these attributes.  The index may
1210be updated with new content, and new commits may be created from the
1211content stored in the index.
1212
1213The index is also capable of storing multiple entries (called "stages")
1214for a given pathname.  These stages are used to hold the various
1215unmerged version of a file when a merge is in progress.
1216
1217FURTHER DOCUMENTATION
1218---------------------
1219
1220See the references in the "description" section to get started
1221using Git.  The following is probably more detail than necessary
1222for a first-time user.
1223
1224The link:user-manual.html#git-concepts[Git concepts chapter of the
1225user-manual] and linkgit:gitcore-tutorial[7] both provide
1226introductions to the underlying Git architecture.
1227
1228See linkgit:gitworkflows[7] for an overview of recommended workflows.
1229
1230See also the link:howto-index.html[howto] documents for some useful
1231examples.
1232
1233The internals are documented in the
1234link:technical/api-index.html[Git API documentation].
1235
1236Users migrating from CVS may also want to
1237read linkgit:gitcvs-migration[7].
1238
1239
1240Authors
1241-------
1242Git was started by Linus Torvalds, and is currently maintained by Junio
1243C Hamano. Numerous contributions have come from the Git mailing list
1244<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1245gives you a more complete list of contributors.
1246
1247If you have a clone of git.git itself, the
1248output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1249the authors for specific parts of the project.
1250
1251Reporting Bugs
1252--------------
1253
1254Report bugs to the Git mailing list <git@vger.kernel.org> where the
1255development and maintenance is primarily done.  You do not have to be
1256subscribed to the list to send a message there.
1257
1258SEE ALSO
1259--------
1260linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1261linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1262linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1263linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1264linkgit:gitworkflows[7]
1265
1266GIT
1267---
1268Part of the linkgit:git[1] suite