Documentation / git.txton commit git: make super-prefix option (74866d7)
   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    [--super-prefix=<path>]
  17    <command> [<args>]
  18
  19DESCRIPTION
  20-----------
  21Git is a fast, scalable, distributed revision control system with an
  22unusually rich command set that provides both high-level operations
  23and full access to internals.
  24
  25See linkgit:gittutorial[7] to get started, then see
  26linkgit:giteveryday[7] for a useful minimum set of
  27commands.  The link:user-manual.html[Git User's Manual] has a more
  28in-depth introduction.
  29
  30After you mastered the basic concepts, you can come back to this
  31page to learn what commands Git offers.  You can learn more about
  32individual Git commands with "git help command".  linkgit:gitcli[7]
  33manual page gives you an overview of the command-line command syntax.
  34
  35A formatted and hyperlinked copy of the latest Git documentation
  36can be viewed at `https://git.github.io/htmldocs/git.html`.
  37
  38ifdef::stalenotes[]
  39[NOTE]
  40============
  41
  42You are reading the documentation for the latest (possibly
  43unreleased) version of Git, that is available from the 'master'
  44branch of the `git.git` repository.
  45Documentation for older releases are available here:
  46
  47* link:v2.10.0/git.html[documentation for release 2.10]
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  49* release notes for
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 433  link:RelNotes/1.5.6.6.txt[1.5.6.6],
 434  link:RelNotes/1.5.6.5.txt[1.5.6.5],
 435  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 436  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 437  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 438  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 439  link:RelNotes/1.5.6.txt[1.5.6].
 440
 441* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 442
 443* release notes for
 444  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 445  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 446  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 447  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 448  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 449  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 450  link:RelNotes/1.5.5.txt[1.5.5].
 451
 452* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 453
 454* release notes for
 455  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 456  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 457  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 458  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 459  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 460  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 461  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 462  link:RelNotes/1.5.4.txt[1.5.4].
 463
 464* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 465
 466* release notes for
 467  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 468  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 469  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 470  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 471  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 472  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 473  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 474  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 475  link:RelNotes/1.5.3.txt[1.5.3].
 476
 477* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 478
 479* release notes for
 480  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 481  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 482  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 483  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 484  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 485  link:RelNotes/1.5.2.txt[1.5.2].
 486
 487* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 488
 489* release notes for
 490  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 491  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 492  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 493  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 494  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 495  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 496  link:RelNotes/1.5.1.txt[1.5.1].
 497
 498* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 499
 500* release notes for
 501  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 502  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 503  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 504  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 505  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 506  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 507  link:RelNotes/1.5.0.txt[1.5.0].
 508
 509* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 510  link:v1.3.3/git.html[1.3.3],
 511  link:v1.2.6/git.html[1.2.6],
 512  link:v1.0.13/git.html[1.0.13].
 513
 514============
 515
 516endif::stalenotes[]
 517
 518OPTIONS
 519-------
 520--version::
 521        Prints the Git suite version that the 'git' program came from.
 522
 523--help::
 524        Prints the synopsis and a list of the most commonly used
 525        commands. If the option `--all` or `-a` is given then all
 526        available commands are printed. If a Git command is named this
 527        option will bring up the manual page for that command.
 528+
 529Other options are available to control how the manual page is
 530displayed. See linkgit:git-help[1] for more information,
 531because `git --help ...` is converted internally into `git
 532help ...`.
 533
 534-C <path>::
 535        Run as if git was started in '<path>' instead of the current working
 536        directory.  When multiple `-C` options are given, each subsequent
 537        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 538        <path>`.
 539+
 540This option affects options that expect path name like `--git-dir` and
 541`--work-tree` in that their interpretations of the path names would be
 542made relative to the working directory caused by the `-C` option. For
 543example the following invocations are equivalent:
 544
 545    git --git-dir=a.git --work-tree=b -C c status
 546    git --git-dir=c/a.git --work-tree=c/b status
 547
 548-c <name>=<value>::
 549        Pass a configuration parameter to the command. The value
 550        given will override values from configuration files.
 551        The <name> is expected in the same format as listed by
 552        'git config' (subkeys separated by dots).
 553+
 554Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 555`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 556config file). Including the equals but with an empty value (like `git -c
 557foo.bar= ...`) sets `foo.bar` to the empty string.
 558
 559--exec-path[=<path>]::
 560        Path to wherever your core Git programs are installed.
 561        This can also be controlled by setting the GIT_EXEC_PATH
 562        environment variable. If no path is given, 'git' will print
 563        the current setting and then exit.
 564
 565--html-path::
 566        Print the path, without trailing slash, where Git's HTML
 567        documentation is installed and exit.
 568
 569--man-path::
 570        Print the manpath (see `man(1)`) for the man pages for
 571        this version of Git and exit.
 572
 573--info-path::
 574        Print the path where the Info files documenting this
 575        version of Git are installed and exit.
 576
 577-p::
 578--paginate::
 579        Pipe all output into 'less' (or if set, $PAGER) if standard
 580        output is a terminal.  This overrides the `pager.<cmd>`
 581        configuration options (see the "Configuration Mechanism" section
 582        below).
 583
 584--no-pager::
 585        Do not pipe Git output into a pager.
 586
 587--git-dir=<path>::
 588        Set the path to the repository. This can also be controlled by
 589        setting the `GIT_DIR` environment variable. It can be an absolute
 590        path or relative path to current working directory.
 591
 592--work-tree=<path>::
 593        Set the path to the working tree. It can be an absolute path
 594        or a path relative to the current working directory.
 595        This can also be controlled by setting the GIT_WORK_TREE
 596        environment variable and the core.worktree configuration
 597        variable (see core.worktree in linkgit:git-config[1] for a
 598        more detailed discussion).
 599
 600--namespace=<path>::
 601        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 602        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 603        variable.
 604
 605--super-prefix=<path>::
 606        Currently for internal use only.  Set a prefix which gives a path from
 607        above a repository down to its root.  One use is to give submodules
 608        context about the superproject that invoked it.
 609
 610--bare::
 611        Treat the repository as a bare repository.  If GIT_DIR
 612        environment is not set, it is set to the current working
 613        directory.
 614
 615--no-replace-objects::
 616        Do not use replacement refs to replace Git objects. See
 617        linkgit:git-replace[1] for more information.
 618
 619--literal-pathspecs::
 620        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 621        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 622        variable to `1`.
 623
 624--glob-pathspecs::
 625        Add "glob" magic to all pathspec. This is equivalent to setting
 626        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 627        globbing on individual pathspecs can be done using pathspec
 628        magic ":(literal)"
 629
 630--noglob-pathspecs::
 631        Add "literal" magic to all pathspec. This is equivalent to setting
 632        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 633        globbing on individual pathspecs can be done using pathspec
 634        magic ":(glob)"
 635
 636--icase-pathspecs::
 637        Add "icase" magic to all pathspec. This is equivalent to setting
 638        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 639
 640GIT COMMANDS
 641------------
 642
 643We divide Git into high level ("porcelain") commands and low level
 644("plumbing") commands.
 645
 646High-level commands (porcelain)
 647-------------------------------
 648
 649We separate the porcelain commands into the main commands and some
 650ancillary user utilities.
 651
 652Main porcelain commands
 653~~~~~~~~~~~~~~~~~~~~~~~
 654
 655include::cmds-mainporcelain.txt[]
 656
 657Ancillary Commands
 658~~~~~~~~~~~~~~~~~~
 659Manipulators:
 660
 661include::cmds-ancillarymanipulators.txt[]
 662
 663Interrogators:
 664
 665include::cmds-ancillaryinterrogators.txt[]
 666
 667
 668Interacting with Others
 669~~~~~~~~~~~~~~~~~~~~~~~
 670
 671These commands are to interact with foreign SCM and with other
 672people via patch over e-mail.
 673
 674include::cmds-foreignscminterface.txt[]
 675
 676
 677Low-level commands (plumbing)
 678-----------------------------
 679
 680Although Git includes its
 681own porcelain layer, its low-level commands are sufficient to support
 682development of alternative porcelains.  Developers of such porcelains
 683might start by reading about linkgit:git-update-index[1] and
 684linkgit:git-read-tree[1].
 685
 686The interface (input, output, set of options and the semantics)
 687to these low-level commands are meant to be a lot more stable
 688than Porcelain level commands, because these commands are
 689primarily for scripted use.  The interface to Porcelain commands
 690on the other hand are subject to change in order to improve the
 691end user experience.
 692
 693The following description divides
 694the low-level commands into commands that manipulate objects (in
 695the repository, index, and working tree), commands that interrogate and
 696compare objects, and commands that move objects and references between
 697repositories.
 698
 699
 700Manipulation commands
 701~~~~~~~~~~~~~~~~~~~~~
 702
 703include::cmds-plumbingmanipulators.txt[]
 704
 705
 706Interrogation commands
 707~~~~~~~~~~~~~~~~~~~~~~
 708
 709include::cmds-plumbinginterrogators.txt[]
 710
 711In general, the interrogate commands do not touch the files in
 712the working tree.
 713
 714
 715Synching repositories
 716~~~~~~~~~~~~~~~~~~~~~
 717
 718include::cmds-synchingrepositories.txt[]
 719
 720The following are helper commands used by the above; end users
 721typically do not use them directly.
 722
 723include::cmds-synchelpers.txt[]
 724
 725
 726Internal helper commands
 727~~~~~~~~~~~~~~~~~~~~~~~~
 728
 729These are internal helper commands used by other commands; end
 730users typically do not use them directly.
 731
 732include::cmds-purehelpers.txt[]
 733
 734
 735Configuration Mechanism
 736-----------------------
 737
 738Git uses a simple text format to store customizations that are per
 739repository and are per user.  Such a configuration file may look
 740like this:
 741
 742------------
 743#
 744# A '#' or ';' character indicates a comment.
 745#
 746
 747; core variables
 748[core]
 749        ; Don't trust file modes
 750        filemode = false
 751
 752; user identity
 753[user]
 754        name = "Junio C Hamano"
 755        email = "gitster@pobox.com"
 756
 757------------
 758
 759Various commands read from the configuration file and adjust
 760their operation accordingly.  See linkgit:git-config[1] for a
 761list and more details about the configuration mechanism.
 762
 763
 764Identifier Terminology
 765----------------------
 766<object>::
 767        Indicates the object name for any type of object.
 768
 769<blob>::
 770        Indicates a blob object name.
 771
 772<tree>::
 773        Indicates a tree object name.
 774
 775<commit>::
 776        Indicates a commit object name.
 777
 778<tree-ish>::
 779        Indicates a tree, commit or tag object name.  A
 780        command that takes a <tree-ish> argument ultimately wants to
 781        operate on a <tree> object but automatically dereferences
 782        <commit> and <tag> objects that point at a <tree>.
 783
 784<commit-ish>::
 785        Indicates a commit or tag object name.  A
 786        command that takes a <commit-ish> argument ultimately wants to
 787        operate on a <commit> object but automatically dereferences
 788        <tag> objects that point at a <commit>.
 789
 790<type>::
 791        Indicates that an object type is required.
 792        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 793
 794<file>::
 795        Indicates a filename - almost always relative to the
 796        root of the tree structure `GIT_INDEX_FILE` describes.
 797
 798Symbolic Identifiers
 799--------------------
 800Any Git command accepting any <object> can also use the following
 801symbolic notation:
 802
 803HEAD::
 804        indicates the head of the current branch.
 805
 806<tag>::
 807        a valid tag 'name'
 808        (i.e. a `refs/tags/<tag>` reference).
 809
 810<head>::
 811        a valid head 'name'
 812        (i.e. a `refs/heads/<head>` reference).
 813
 814For a more complete list of ways to spell object names, see
 815"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 816
 817
 818File/Directory Structure
 819------------------------
 820
 821Please see the linkgit:gitrepository-layout[5] document.
 822
 823Read linkgit:githooks[5] for more details about each hook.
 824
 825Higher level SCMs may provide and manage additional information in the
 826`$GIT_DIR`.
 827
 828
 829Terminology
 830-----------
 831Please see linkgit:gitglossary[7].
 832
 833
 834Environment Variables
 835---------------------
 836Various Git commands use the following environment variables:
 837
 838The Git Repository
 839~~~~~~~~~~~~~~~~~~
 840These environment variables apply to 'all' core Git commands. Nb: it
 841is worth noting that they may be used/overridden by SCMS sitting above
 842Git so take care if using a foreign front-end.
 843
 844`GIT_INDEX_FILE`::
 845        This environment allows the specification of an alternate
 846        index file. If not specified, the default of `$GIT_DIR/index`
 847        is used.
 848
 849`GIT_INDEX_VERSION`::
 850        This environment variable allows the specification of an index
 851        version for new repositories.  It won't affect existing index
 852        files.  By default index file version 2 or 3 is used. See
 853        linkgit:git-update-index[1] for more information.
 854
 855`GIT_OBJECT_DIRECTORY`::
 856        If the object storage directory is specified via this
 857        environment variable then the sha1 directories are created
 858        underneath - otherwise the default `$GIT_DIR/objects`
 859        directory is used.
 860
 861`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 862        Due to the immutable nature of Git objects, old objects can be
 863        archived into shared, read-only directories. This variable
 864        specifies a ":" separated (on Windows ";" separated) list
 865        of Git object directories which can be used to search for Git
 866        objects. New objects will not be written to these directories.
 867
 868`GIT_DIR`::
 869        If the `GIT_DIR` environment variable is set then it
 870        specifies a path to use instead of the default `.git`
 871        for the base of the repository.
 872        The `--git-dir` command-line option also sets this value.
 873
 874`GIT_WORK_TREE`::
 875        Set the path to the root of the working tree.
 876        This can also be controlled by the `--work-tree` command-line
 877        option and the core.worktree configuration variable.
 878
 879`GIT_NAMESPACE`::
 880        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 881        The `--namespace` command-line option also sets this value.
 882
 883`GIT_CEILING_DIRECTORIES`::
 884        This should be a colon-separated list of absolute paths.  If
 885        set, it is a list of directories that Git should not chdir up
 886        into while looking for a repository directory (useful for
 887        excluding slow-loading network directories).  It will not
 888        exclude the current working directory or a GIT_DIR set on the
 889        command line or in the environment.  Normally, Git has to read
 890        the entries in this list and resolve any symlink that
 891        might be present in order to compare them with the current
 892        directory.  However, if even this access is slow, you
 893        can add an empty entry to the list to tell Git that the
 894        subsequent entries are not symlinks and needn't be resolved;
 895        e.g.,
 896        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 897
 898`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 899        When run in a directory that does not have ".git" repository
 900        directory, Git tries to find such a directory in the parent
 901        directories to find the top of the working tree, but by default it
 902        does not cross filesystem boundaries.  This environment variable
 903        can be set to true to tell Git not to stop at filesystem
 904        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 905        an explicit repository directory set via `GIT_DIR` or on the
 906        command line.
 907
 908`GIT_COMMON_DIR`::
 909        If this variable is set to a path, non-worktree files that are
 910        normally in $GIT_DIR will be taken from this path
 911        instead. Worktree-specific files such as HEAD or index are
 912        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 913        linkgit:git-worktree[1] for
 914        details. This variable has lower precedence than other path
 915        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 916
 917Git Commits
 918~~~~~~~~~~~
 919`GIT_AUTHOR_NAME`::
 920`GIT_AUTHOR_EMAIL`::
 921`GIT_AUTHOR_DATE`::
 922`GIT_COMMITTER_NAME`::
 923`GIT_COMMITTER_EMAIL`::
 924`GIT_COMMITTER_DATE`::
 925'EMAIL'::
 926        see linkgit:git-commit-tree[1]
 927
 928Git Diffs
 929~~~~~~~~~
 930`GIT_DIFF_OPTS`::
 931        Only valid setting is "--unified=??" or "-u??" to set the
 932        number of context lines shown when a unified diff is created.
 933        This takes precedence over any "-U" or "--unified" option
 934        value passed on the Git diff command line.
 935
 936`GIT_EXTERNAL_DIFF`::
 937        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 938        program named by it is called, instead of the diff invocation
 939        described above.  For a path that is added, removed, or modified,
 940        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 941
 942        path old-file old-hex old-mode new-file new-hex new-mode
 943+
 944where:
 945
 946        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 947                         contents of <old|new>,
 948        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 949        <old|new>-mode:: are the octal representation of the file modes.
 950+
 951The file parameters can point at the user's working file
 952(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 953when a new file is added), or a temporary file (e.g. `old-file` in the
 954index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 955temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 956+
 957For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 958parameter, <path>.
 959+
 960For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 961`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 962
 963`GIT_DIFF_PATH_COUNTER`::
 964        A 1-based counter incremented by one for every path.
 965
 966`GIT_DIFF_PATH_TOTAL`::
 967        The total number of paths.
 968
 969other
 970~~~~~
 971`GIT_MERGE_VERBOSITY`::
 972        A number controlling the amount of output shown by
 973        the recursive merge strategy.  Overrides merge.verbosity.
 974        See linkgit:git-merge[1]
 975
 976`GIT_PAGER`::
 977        This environment variable overrides `$PAGER`. If it is set
 978        to an empty string or to the value "cat", Git will not launch
 979        a pager.  See also the `core.pager` option in
 980        linkgit:git-config[1].
 981
 982`GIT_EDITOR`::
 983        This environment variable overrides `$EDITOR` and `$VISUAL`.
 984        It is used by several Git commands when, on interactive mode,
 985        an editor is to be launched. See also linkgit:git-var[1]
 986        and the `core.editor` option in linkgit:git-config[1].
 987
 988`GIT_SSH`::
 989`GIT_SSH_COMMAND`::
 990        If either of these environment variables is set then 'git fetch'
 991        and 'git push' will use the specified command instead of 'ssh'
 992        when they need to connect to a remote system.
 993        The command will be given exactly two or four arguments: the
 994        'username@host' (or just 'host') from the URL and the shell
 995        command to execute on that remote system, optionally preceded by
 996        `-p` (literally) and the 'port' from the URL when it specifies
 997        something other than the default SSH port.
 998+
 999`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
1000by the shell, which allows additional arguments to be included.
1001`$GIT_SSH` on the other hand must be just the path to a program
1002(which can be a wrapper shell script, if additional arguments are
1003needed).
1004+
1005Usually it is easier to configure any desired options through your
1006personal `.ssh/config` file.  Please consult your ssh documentation
1007for further details.
1008
1009`GIT_ASKPASS`::
1010        If this environment variable is set, then Git commands which need to
1011        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1012        will call this program with a suitable prompt as command-line argument
1013        and read the password from its STDOUT. See also the `core.askPass`
1014        option in linkgit:git-config[1].
1015
1016`GIT_TERMINAL_PROMPT`::
1017        If this environment variable is set to `0`, git will not prompt
1018        on the terminal (e.g., when asking for HTTP authentication).
1019
1020`GIT_CONFIG_NOSYSTEM`::
1021        Whether to skip reading settings from the system-wide
1022        `$(prefix)/etc/gitconfig` file.  This environment variable can
1023        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1024        predictable environment for a picky script, or you can set it
1025        temporarily to avoid using a buggy `/etc/gitconfig` file while
1026        waiting for someone with sufficient permissions to fix it.
1027
1028`GIT_FLUSH`::
1029        If this environment variable is set to "1", then commands such
1030        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1031        'git check-attr' and 'git check-ignore' will
1032        force a flush of the output stream after each record have been
1033        flushed. If this
1034        variable is set to "0", the output of these commands will be done
1035        using completely buffered I/O.   If this environment variable is
1036        not set, Git will choose buffered or record-oriented flushing
1037        based on whether stdout appears to be redirected to a file or not.
1038
1039`GIT_TRACE`::
1040        Enables general trace messages, e.g. alias expansion, built-in
1041        command execution and external command execution.
1042+
1043If this variable is set to "1", "2" or "true" (comparison
1044is case insensitive), trace messages will be printed to
1045stderr.
1046+
1047If the variable is set to an integer value greater than 2
1048and lower than 10 (strictly) then Git will interpret this
1049value as an open file descriptor and will try to write the
1050trace messages into this file descriptor.
1051+
1052Alternatively, if the variable is set to an absolute path
1053(starting with a '/' character), Git will interpret this
1054as a file path and will try to write the trace messages
1055into it.
1056+
1057Unsetting the variable, or setting it to empty, "0" or
1058"false" (case insensitive) disables trace messages.
1059
1060`GIT_TRACE_PACK_ACCESS`::
1061        Enables trace messages for all accesses to any packs. For each
1062        access, the pack file name and an offset in the pack is
1063        recorded. This may be helpful for troubleshooting some
1064        pack-related performance problems.
1065        See `GIT_TRACE` for available trace output options.
1066
1067`GIT_TRACE_PACKET`::
1068        Enables trace messages for all packets coming in or out of a
1069        given program. This can help with debugging object negotiation
1070        or other protocol issues. Tracing is turned off at a packet
1071        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1072        See `GIT_TRACE` for available trace output options.
1073
1074`GIT_TRACE_PACKFILE`::
1075        Enables tracing of packfiles sent or received by a
1076        given program. Unlike other trace output, this trace is
1077        verbatim: no headers, and no quoting of binary data. You almost
1078        certainly want to direct into a file (e.g.,
1079        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1080        the terminal or mixing it with other trace output.
1081+
1082Note that this is currently only implemented for the client side
1083of clones and fetches.
1084
1085`GIT_TRACE_PERFORMANCE`::
1086        Enables performance related trace messages, e.g. total execution
1087        time of each Git command.
1088        See `GIT_TRACE` for available trace output options.
1089
1090`GIT_TRACE_SETUP`::
1091        Enables trace messages printing the .git, working tree and current
1092        working directory after Git has completed its setup phase.
1093        See `GIT_TRACE` for available trace output options.
1094
1095`GIT_TRACE_SHALLOW`::
1096        Enables trace messages that can help debugging fetching /
1097        cloning of shallow repositories.
1098        See `GIT_TRACE` for available trace output options.
1099
1100`GIT_TRACE_CURL`::
1101        Enables a curl full trace dump of all incoming and outgoing data,
1102        including descriptive information, of the git transport protocol.
1103        This is similar to doing curl `--trace-ascii` on the command line.
1104        This option overrides setting the `GIT_CURL_VERBOSE` environment
1105        variable.
1106        See `GIT_TRACE` for available trace output options.
1107
1108`GIT_LITERAL_PATHSPECS`::
1109        Setting this variable to `1` will cause Git to treat all
1110        pathspecs literally, rather than as glob patterns. For example,
1111        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1112        for commits that touch the path `*.c`, not any paths that the
1113        glob `*.c` matches. You might want this if you are feeding
1114        literal paths to Git (e.g., paths previously given to you by
1115        `git ls-tree`, `--raw` diff output, etc).
1116
1117`GIT_GLOB_PATHSPECS`::
1118        Setting this variable to `1` will cause Git to treat all
1119        pathspecs as glob patterns (aka "glob" magic).
1120
1121`GIT_NOGLOB_PATHSPECS`::
1122        Setting this variable to `1` will cause Git to treat all
1123        pathspecs as literal (aka "literal" magic).
1124
1125`GIT_ICASE_PATHSPECS`::
1126        Setting this variable to `1` will cause Git to treat all
1127        pathspecs as case-insensitive.
1128
1129`GIT_REFLOG_ACTION`::
1130        When a ref is updated, reflog entries are created to keep
1131        track of the reason why the ref was updated (which is
1132        typically the name of the high-level command that updated
1133        the ref), in addition to the old and new values of the ref.
1134        A scripted Porcelain command can use set_reflog_action
1135        helper function in `git-sh-setup` to set its name to this
1136        variable when it is invoked as the top level command by the
1137        end user, to be recorded in the body of the reflog.
1138
1139`GIT_REF_PARANOIA`::
1140        If set to `1`, include broken or badly named refs when iterating
1141        over lists of refs. In a normal, non-corrupted repository, this
1142        does nothing. However, enabling it may help git to detect and
1143        abort some operations in the presence of broken refs. Git sets
1144        this variable automatically when performing destructive
1145        operations like linkgit:git-prune[1]. You should not need to set
1146        it yourself unless you want to be paranoid about making sure
1147        an operation has touched every ref (e.g., because you are
1148        cloning a repository to make a backup).
1149
1150`GIT_ALLOW_PROTOCOL`::
1151        If set, provide a colon-separated list of protocols which are
1152        allowed to be used with fetch/push/clone. This is useful to
1153        restrict recursive submodule initialization from an untrusted
1154        repository. Any protocol not mentioned will be disallowed (i.e.,
1155        this is a whitelist, not a blacklist). If the variable is not
1156        set at all, all protocols are enabled.  The protocol names
1157        currently used by git are:
1158
1159          - `file`: any local file-based path (including `file://` URLs,
1160            or local paths)
1161
1162          - `git`: the anonymous git protocol over a direct TCP
1163            connection (or proxy, if configured)
1164
1165          - `ssh`: git over ssh (including `host:path` syntax,
1166            `ssh://`, etc).
1167
1168          - `http`: git over http, both "smart http" and "dumb http".
1169            Note that this does _not_ include `https`; if you want both,
1170            you should specify both as `http:https`.
1171
1172          - any external helpers are named by their protocol (e.g., use
1173            `hg` to allow the `git-remote-hg` helper)
1174
1175
1176Discussion[[Discussion]]
1177------------------------
1178
1179More detail on the following is available from the
1180link:user-manual.html#git-concepts[Git concepts chapter of the
1181user-manual] and linkgit:gitcore-tutorial[7].
1182
1183A Git project normally consists of a working directory with a ".git"
1184subdirectory at the top level.  The .git directory contains, among other
1185things, a compressed object database representing the complete history
1186of the project, an "index" file which links that history to the current
1187contents of the working tree, and named pointers into that history such
1188as tags and branch heads.
1189
1190The object database contains objects of three main types: blobs, which
1191hold file data; trees, which point to blobs and other trees to build up
1192directory hierarchies; and commits, which each reference a single tree
1193and some number of parent commits.
1194
1195The commit, equivalent to what other systems call a "changeset" or
1196"version", represents a step in the project's history, and each parent
1197represents an immediately preceding step.  Commits with more than one
1198parent represent merges of independent lines of development.
1199
1200All objects are named by the SHA-1 hash of their contents, normally
1201written as a string of 40 hex digits.  Such names are globally unique.
1202The entire history leading up to a commit can be vouched for by signing
1203just that commit.  A fourth object type, the tag, is provided for this
1204purpose.
1205
1206When first created, objects are stored in individual files, but for
1207efficiency may later be compressed together into "pack files".
1208
1209Named pointers called refs mark interesting points in history.  A ref
1210may contain the SHA-1 name of an object or the name of another ref.  Refs
1211with names beginning `ref/head/` contain the SHA-1 name of the most
1212recent commit (or "head") of a branch under development.  SHA-1 names of
1213tags of interest are stored under `ref/tags/`.  A special ref named
1214`HEAD` contains the name of the currently checked-out branch.
1215
1216The index file is initialized with a list of all paths and, for each
1217path, a blob object and a set of attributes.  The blob object represents
1218the contents of the file as of the head of the current branch.  The
1219attributes (last modified time, size, etc.) are taken from the
1220corresponding file in the working tree.  Subsequent changes to the
1221working tree can be found by comparing these attributes.  The index may
1222be updated with new content, and new commits may be created from the
1223content stored in the index.
1224
1225The index is also capable of storing multiple entries (called "stages")
1226for a given pathname.  These stages are used to hold the various
1227unmerged version of a file when a merge is in progress.
1228
1229FURTHER DOCUMENTATION
1230---------------------
1231
1232See the references in the "description" section to get started
1233using Git.  The following is probably more detail than necessary
1234for a first-time user.
1235
1236The link:user-manual.html#git-concepts[Git concepts chapter of the
1237user-manual] and linkgit:gitcore-tutorial[7] both provide
1238introductions to the underlying Git architecture.
1239
1240See linkgit:gitworkflows[7] for an overview of recommended workflows.
1241
1242See also the link:howto-index.html[howto] documents for some useful
1243examples.
1244
1245The internals are documented in the
1246link:technical/api-index.html[Git API documentation].
1247
1248Users migrating from CVS may also want to
1249read linkgit:gitcvs-migration[7].
1250
1251
1252Authors
1253-------
1254Git was started by Linus Torvalds, and is currently maintained by Junio
1255C Hamano. Numerous contributions have come from the Git mailing list
1256<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1257gives you a more complete list of contributors.
1258
1259If you have a clone of git.git itself, the
1260output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1261the authors for specific parts of the project.
1262
1263Reporting Bugs
1264--------------
1265
1266Report bugs to the Git mailing list <git@vger.kernel.org> where the
1267development and maintenance is primarily done.  You do not have to be
1268subscribed to the list to send a message there.
1269
1270SEE ALSO
1271--------
1272linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1273linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1274linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1275linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1276linkgit:gitworkflows[7]
1277
1278GIT
1279---
1280Part of the linkgit:git[1] suite