Documentation / git.txton commit cvsserver: move safe_pipe_capture() to the main package (fce13af)
   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
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 430  link:RelNotes/1.6.0.txt[1.6.0].
 431
 432* link:v1.5.6.6/git.html[documentation for release 1.5.6.6]
 433
 434* release notes for
 435  link:RelNotes/1.5.6.6.txt[1.5.6.6],
 436  link:RelNotes/1.5.6.5.txt[1.5.6.5],
 437  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 438  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 439  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 440  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 441  link:RelNotes/1.5.6.txt[1.5.6].
 442
 443* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 444
 445* release notes for
 446  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 447  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 448  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 449  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 450  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 451  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 452  link:RelNotes/1.5.5.txt[1.5.5].
 453
 454* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 455
 456* release notes for
 457  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 458  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 459  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 460  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 461  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 462  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 463  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 464  link:RelNotes/1.5.4.txt[1.5.4].
 465
 466* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 467
 468* release notes for
 469  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 470  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 471  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 472  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 473  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 474  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 475  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 476  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 477  link:RelNotes/1.5.3.txt[1.5.3].
 478
 479* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 480
 481* release notes for
 482  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 483  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 484  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 485  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 486  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 487  link:RelNotes/1.5.2.txt[1.5.2].
 488
 489* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 490
 491* release notes for
 492  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 493  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 494  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 495  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 496  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 497  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 498  link:RelNotes/1.5.1.txt[1.5.1].
 499
 500* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 501
 502* release notes for
 503  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 504  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 505  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 506  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 507  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 508  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 509  link:RelNotes/1.5.0.txt[1.5.0].
 510
 511* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 512  link:v1.3.3/git.html[1.3.3],
 513  link:v1.2.6/git.html[1.2.6],
 514  link:v1.0.13/git.html[1.0.13].
 515
 516============
 517
 518endif::stalenotes[]
 519
 520OPTIONS
 521-------
 522--version::
 523        Prints the Git suite version that the 'git' program came from.
 524
 525--help::
 526        Prints the synopsis and a list of the most commonly used
 527        commands. If the option `--all` or `-a` is given then all
 528        available commands are printed. If a Git command is named this
 529        option will bring up the manual page for that command.
 530+
 531Other options are available to control how the manual page is
 532displayed. See linkgit:git-help[1] for more information,
 533because `git --help ...` is converted internally into `git
 534help ...`.
 535
 536-C <path>::
 537        Run as if git was started in '<path>' instead of the current working
 538        directory.  When multiple `-C` options are given, each subsequent
 539        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 540        <path>`.
 541+
 542This option affects options that expect path name like `--git-dir` and
 543`--work-tree` in that their interpretations of the path names would be
 544made relative to the working directory caused by the `-C` option. For
 545example the following invocations are equivalent:
 546
 547    git --git-dir=a.git --work-tree=b -C c status
 548    git --git-dir=c/a.git --work-tree=c/b status
 549
 550-c <name>=<value>::
 551        Pass a configuration parameter to the command. The value
 552        given will override values from configuration files.
 553        The <name> is expected in the same format as listed by
 554        'git config' (subkeys separated by dots).
 555+
 556Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 557`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 558config file). Including the equals but with an empty value (like `git -c
 559foo.bar= ...`) sets `foo.bar` to the empty string.
 560
 561--exec-path[=<path>]::
 562        Path to wherever your core Git programs are installed.
 563        This can also be controlled by setting the GIT_EXEC_PATH
 564        environment variable. If no path is given, 'git' will print
 565        the current setting and then exit.
 566
 567--html-path::
 568        Print the path, without trailing slash, where Git's HTML
 569        documentation is installed and exit.
 570
 571--man-path::
 572        Print the manpath (see `man(1)`) for the man pages for
 573        this version of Git and exit.
 574
 575--info-path::
 576        Print the path where the Info files documenting this
 577        version of Git are installed and exit.
 578
 579-p::
 580--paginate::
 581        Pipe all output into 'less' (or if set, $PAGER) if standard
 582        output is a terminal.  This overrides the `pager.<cmd>`
 583        configuration options (see the "Configuration Mechanism" section
 584        below).
 585
 586--no-pager::
 587        Do not pipe Git output into a pager.
 588
 589--git-dir=<path>::
 590        Set the path to the repository. This can also be controlled by
 591        setting the `GIT_DIR` environment variable. It can be an absolute
 592        path or relative path to current working directory.
 593
 594--work-tree=<path>::
 595        Set the path to the working tree. It can be an absolute path
 596        or a path relative to the current working directory.
 597        This can also be controlled by setting the GIT_WORK_TREE
 598        environment variable and the core.worktree configuration
 599        variable (see core.worktree in linkgit:git-config[1] for a
 600        more detailed discussion).
 601
 602--namespace=<path>::
 603        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 604        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 605        variable.
 606
 607--bare::
 608        Treat the repository as a bare repository.  If GIT_DIR
 609        environment is not set, it is set to the current working
 610        directory.
 611
 612--no-replace-objects::
 613        Do not use replacement refs to replace Git objects. See
 614        linkgit:git-replace[1] for more information.
 615
 616--literal-pathspecs::
 617        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 618        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 619        variable to `1`.
 620
 621--glob-pathspecs::
 622        Add "glob" magic to all pathspec. This is equivalent to setting
 623        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 624        globbing on individual pathspecs can be done using pathspec
 625        magic ":(literal)"
 626
 627--noglob-pathspecs::
 628        Add "literal" magic to all pathspec. This is equivalent to setting
 629        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 630        globbing on individual pathspecs can be done using pathspec
 631        magic ":(glob)"
 632
 633--icase-pathspecs::
 634        Add "icase" magic to all pathspec. This is equivalent to setting
 635        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 636
 637GIT COMMANDS
 638------------
 639
 640We divide Git into high level ("porcelain") commands and low level
 641("plumbing") commands.
 642
 643High-level commands (porcelain)
 644-------------------------------
 645
 646We separate the porcelain commands into the main commands and some
 647ancillary user utilities.
 648
 649Main porcelain commands
 650~~~~~~~~~~~~~~~~~~~~~~~
 651
 652include::cmds-mainporcelain.txt[]
 653
 654Ancillary Commands
 655~~~~~~~~~~~~~~~~~~
 656Manipulators:
 657
 658include::cmds-ancillarymanipulators.txt[]
 659
 660Interrogators:
 661
 662include::cmds-ancillaryinterrogators.txt[]
 663
 664
 665Interacting with Others
 666~~~~~~~~~~~~~~~~~~~~~~~
 667
 668These commands are to interact with foreign SCM and with other
 669people via patch over e-mail.
 670
 671include::cmds-foreignscminterface.txt[]
 672
 673
 674Low-level commands (plumbing)
 675-----------------------------
 676
 677Although Git includes its
 678own porcelain layer, its low-level commands are sufficient to support
 679development of alternative porcelains.  Developers of such porcelains
 680might start by reading about linkgit:git-update-index[1] and
 681linkgit:git-read-tree[1].
 682
 683The interface (input, output, set of options and the semantics)
 684to these low-level commands are meant to be a lot more stable
 685than Porcelain level commands, because these commands are
 686primarily for scripted use.  The interface to Porcelain commands
 687on the other hand are subject to change in order to improve the
 688end user experience.
 689
 690The following description divides
 691the low-level commands into commands that manipulate objects (in
 692the repository, index, and working tree), commands that interrogate and
 693compare objects, and commands that move objects and references between
 694repositories.
 695
 696
 697Manipulation commands
 698~~~~~~~~~~~~~~~~~~~~~
 699
 700include::cmds-plumbingmanipulators.txt[]
 701
 702
 703Interrogation commands
 704~~~~~~~~~~~~~~~~~~~~~~
 705
 706include::cmds-plumbinginterrogators.txt[]
 707
 708In general, the interrogate commands do not touch the files in
 709the working tree.
 710
 711
 712Synching repositories
 713~~~~~~~~~~~~~~~~~~~~~
 714
 715include::cmds-synchingrepositories.txt[]
 716
 717The following are helper commands used by the above; end users
 718typically do not use them directly.
 719
 720include::cmds-synchelpers.txt[]
 721
 722
 723Internal helper commands
 724~~~~~~~~~~~~~~~~~~~~~~~~
 725
 726These are internal helper commands used by other commands; end
 727users typically do not use them directly.
 728
 729include::cmds-purehelpers.txt[]
 730
 731
 732Configuration Mechanism
 733-----------------------
 734
 735Git uses a simple text format to store customizations that are per
 736repository and are per user.  Such a configuration file may look
 737like this:
 738
 739------------
 740#
 741# A '#' or ';' character indicates a comment.
 742#
 743
 744; core variables
 745[core]
 746        ; Don't trust file modes
 747        filemode = false
 748
 749; user identity
 750[user]
 751        name = "Junio C Hamano"
 752        email = "gitster@pobox.com"
 753
 754------------
 755
 756Various commands read from the configuration file and adjust
 757their operation accordingly.  See linkgit:git-config[1] for a
 758list and more details about the configuration mechanism.
 759
 760
 761Identifier Terminology
 762----------------------
 763<object>::
 764        Indicates the object name for any type of object.
 765
 766<blob>::
 767        Indicates a blob object name.
 768
 769<tree>::
 770        Indicates a tree object name.
 771
 772<commit>::
 773        Indicates a commit object name.
 774
 775<tree-ish>::
 776        Indicates a tree, commit or tag object name.  A
 777        command that takes a <tree-ish> argument ultimately wants to
 778        operate on a <tree> object but automatically dereferences
 779        <commit> and <tag> objects that point at a <tree>.
 780
 781<commit-ish>::
 782        Indicates a commit or tag object name.  A
 783        command that takes a <commit-ish> argument ultimately wants to
 784        operate on a <commit> object but automatically dereferences
 785        <tag> objects that point at a <commit>.
 786
 787<type>::
 788        Indicates that an object type is required.
 789        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 790
 791<file>::
 792        Indicates a filename - almost always relative to the
 793        root of the tree structure `GIT_INDEX_FILE` describes.
 794
 795Symbolic Identifiers
 796--------------------
 797Any Git command accepting any <object> can also use the following
 798symbolic notation:
 799
 800HEAD::
 801        indicates the head of the current branch.
 802
 803<tag>::
 804        a valid tag 'name'
 805        (i.e. a `refs/tags/<tag>` reference).
 806
 807<head>::
 808        a valid head 'name'
 809        (i.e. a `refs/heads/<head>` reference).
 810
 811For a more complete list of ways to spell object names, see
 812"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 813
 814
 815File/Directory Structure
 816------------------------
 817
 818Please see the linkgit:gitrepository-layout[5] document.
 819
 820Read linkgit:githooks[5] for more details about each hook.
 821
 822Higher level SCMs may provide and manage additional information in the
 823`$GIT_DIR`.
 824
 825
 826Terminology
 827-----------
 828Please see linkgit:gitglossary[7].
 829
 830
 831Environment Variables
 832---------------------
 833Various Git commands use the following environment variables:
 834
 835The Git Repository
 836~~~~~~~~~~~~~~~~~~
 837These environment variables apply to 'all' core Git commands. Nb: it
 838is worth noting that they may be used/overridden by SCMS sitting above
 839Git so take care if using a foreign front-end.
 840
 841`GIT_INDEX_FILE`::
 842        This environment allows the specification of an alternate
 843        index file. If not specified, the default of `$GIT_DIR/index`
 844        is used.
 845
 846`GIT_INDEX_VERSION`::
 847        This environment variable allows the specification of an index
 848        version for new repositories.  It won't affect existing index
 849        files.  By default index file version 2 or 3 is used. See
 850        linkgit:git-update-index[1] for more information.
 851
 852`GIT_OBJECT_DIRECTORY`::
 853        If the object storage directory is specified via this
 854        environment variable then the sha1 directories are created
 855        underneath - otherwise the default `$GIT_DIR/objects`
 856        directory is used.
 857
 858`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 859        Due to the immutable nature of Git objects, old objects can be
 860        archived into shared, read-only directories. This variable
 861        specifies a ":" separated (on Windows ";" separated) list
 862        of Git object directories which can be used to search for Git
 863        objects. New objects will not be written to these directories.
 864
 865`GIT_DIR`::
 866        If the `GIT_DIR` environment variable is set then it
 867        specifies a path to use instead of the default `.git`
 868        for the base of the repository.
 869        The `--git-dir` command-line option also sets this value.
 870
 871`GIT_WORK_TREE`::
 872        Set the path to the root of the working tree.
 873        This can also be controlled by the `--work-tree` command-line
 874        option and the core.worktree configuration variable.
 875
 876`GIT_NAMESPACE`::
 877        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 878        The `--namespace` command-line option also sets this value.
 879
 880`GIT_CEILING_DIRECTORIES`::
 881        This should be a colon-separated list of absolute paths.  If
 882        set, it is a list of directories that Git should not chdir up
 883        into while looking for a repository directory (useful for
 884        excluding slow-loading network directories).  It will not
 885        exclude the current working directory or a GIT_DIR set on the
 886        command line or in the environment.  Normally, Git has to read
 887        the entries in this list and resolve any symlink that
 888        might be present in order to compare them with the current
 889        directory.  However, if even this access is slow, you
 890        can add an empty entry to the list to tell Git that the
 891        subsequent entries are not symlinks and needn't be resolved;
 892        e.g.,
 893        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 894
 895`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 896        When run in a directory that does not have ".git" repository
 897        directory, Git tries to find such a directory in the parent
 898        directories to find the top of the working tree, but by default it
 899        does not cross filesystem boundaries.  This environment variable
 900        can be set to true to tell Git not to stop at filesystem
 901        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 902        an explicit repository directory set via `GIT_DIR` or on the
 903        command line.
 904
 905`GIT_COMMON_DIR`::
 906        If this variable is set to a path, non-worktree files that are
 907        normally in $GIT_DIR will be taken from this path
 908        instead. Worktree-specific files such as HEAD or index are
 909        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 910        linkgit:git-worktree[1] for
 911        details. This variable has lower precedence than other path
 912        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 913
 914Git Commits
 915~~~~~~~~~~~
 916`GIT_AUTHOR_NAME`::
 917`GIT_AUTHOR_EMAIL`::
 918`GIT_AUTHOR_DATE`::
 919`GIT_COMMITTER_NAME`::
 920`GIT_COMMITTER_EMAIL`::
 921`GIT_COMMITTER_DATE`::
 922'EMAIL'::
 923        see linkgit:git-commit-tree[1]
 924
 925Git Diffs
 926~~~~~~~~~
 927`GIT_DIFF_OPTS`::
 928        Only valid setting is "--unified=??" or "-u??" to set the
 929        number of context lines shown when a unified diff is created.
 930        This takes precedence over any "-U" or "--unified" option
 931        value passed on the Git diff command line.
 932
 933`GIT_EXTERNAL_DIFF`::
 934        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 935        program named by it is called, instead of the diff invocation
 936        described above.  For a path that is added, removed, or modified,
 937        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 938
 939        path old-file old-hex old-mode new-file new-hex new-mode
 940+
 941where:
 942
 943        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 944                         contents of <old|new>,
 945        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 946        <old|new>-mode:: are the octal representation of the file modes.
 947+
 948The file parameters can point at the user's working file
 949(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 950when a new file is added), or a temporary file (e.g. `old-file` in the
 951index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 952temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 953+
 954For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 955parameter, <path>.
 956+
 957For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 958`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 959
 960`GIT_DIFF_PATH_COUNTER`::
 961        A 1-based counter incremented by one for every path.
 962
 963`GIT_DIFF_PATH_TOTAL`::
 964        The total number of paths.
 965
 966other
 967~~~~~
 968`GIT_MERGE_VERBOSITY`::
 969        A number controlling the amount of output shown by
 970        the recursive merge strategy.  Overrides merge.verbosity.
 971        See linkgit:git-merge[1]
 972
 973`GIT_PAGER`::
 974        This environment variable overrides `$PAGER`. If it is set
 975        to an empty string or to the value "cat", Git will not launch
 976        a pager.  See also the `core.pager` option in
 977        linkgit:git-config[1].
 978
 979`GIT_EDITOR`::
 980        This environment variable overrides `$EDITOR` and `$VISUAL`.
 981        It is used by several Git commands when, on interactive mode,
 982        an editor is to be launched. See also linkgit:git-var[1]
 983        and the `core.editor` option in linkgit:git-config[1].
 984
 985`GIT_SSH`::
 986`GIT_SSH_COMMAND`::
 987        If either of these environment variables is set then 'git fetch'
 988        and 'git push' will use the specified command instead of 'ssh'
 989        when they need to connect to a remote system.
 990        The command will be given exactly two or four arguments: the
 991        'username@host' (or just 'host') from the URL and the shell
 992        command to execute on that remote system, optionally preceded by
 993        `-p` (literally) and the 'port' from the URL when it specifies
 994        something other than the default SSH port.
 995+
 996`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 997by the shell, which allows additional arguments to be included.
 998`$GIT_SSH` on the other hand must be just the path to a program
 999(which can be a wrapper shell script, if additional arguments are
1000needed).
1001+
1002Usually it is easier to configure any desired options through your
1003personal `.ssh/config` file.  Please consult your ssh documentation
1004for further details.
1005
1006`GIT_ASKPASS`::
1007        If this environment variable is set, then Git commands which need to
1008        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1009        will call this program with a suitable prompt as command-line argument
1010        and read the password from its STDOUT. See also the `core.askPass`
1011        option in linkgit:git-config[1].
1012
1013`GIT_TERMINAL_PROMPT`::
1014        If this environment variable is set to `0`, git will not prompt
1015        on the terminal (e.g., when asking for HTTP authentication).
1016
1017`GIT_CONFIG_NOSYSTEM`::
1018        Whether to skip reading settings from the system-wide
1019        `$(prefix)/etc/gitconfig` file.  This environment variable can
1020        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1021        predictable environment for a picky script, or you can set it
1022        temporarily to avoid using a buggy `/etc/gitconfig` file while
1023        waiting for someone with sufficient permissions to fix it.
1024
1025`GIT_FLUSH`::
1026        If this environment variable is set to "1", then commands such
1027        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1028        'git check-attr' and 'git check-ignore' will
1029        force a flush of the output stream after each record have been
1030        flushed. If this
1031        variable is set to "0", the output of these commands will be done
1032        using completely buffered I/O.   If this environment variable is
1033        not set, Git will choose buffered or record-oriented flushing
1034        based on whether stdout appears to be redirected to a file or not.
1035
1036`GIT_TRACE`::
1037        Enables general trace messages, e.g. alias expansion, built-in
1038        command execution and external command execution.
1039+
1040If this variable is set to "1", "2" or "true" (comparison
1041is case insensitive), trace messages will be printed to
1042stderr.
1043+
1044If the variable is set to an integer value greater than 2
1045and lower than 10 (strictly) then Git will interpret this
1046value as an open file descriptor and will try to write the
1047trace messages into this file descriptor.
1048+
1049Alternatively, if the variable is set to an absolute path
1050(starting with a '/' character), Git will interpret this
1051as a file path and will try to write the trace messages
1052into it.
1053+
1054Unsetting the variable, or setting it to empty, "0" or
1055"false" (case insensitive) disables trace messages.
1056
1057`GIT_TRACE_PACK_ACCESS`::
1058        Enables trace messages for all accesses to any packs. For each
1059        access, the pack file name and an offset in the pack is
1060        recorded. This may be helpful for troubleshooting some
1061        pack-related performance problems.
1062        See `GIT_TRACE` for available trace output options.
1063
1064`GIT_TRACE_PACKET`::
1065        Enables trace messages for all packets coming in or out of a
1066        given program. This can help with debugging object negotiation
1067        or other protocol issues. Tracing is turned off at a packet
1068        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1069        See `GIT_TRACE` for available trace output options.
1070
1071`GIT_TRACE_PACKFILE`::
1072        Enables tracing of packfiles sent or received by a
1073        given program. Unlike other trace output, this trace is
1074        verbatim: no headers, and no quoting of binary data. You almost
1075        certainly want to direct into a file (e.g.,
1076        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1077        the terminal or mixing it with other trace output.
1078+
1079Note that this is currently only implemented for the client side
1080of clones and fetches.
1081
1082`GIT_TRACE_PERFORMANCE`::
1083        Enables performance related trace messages, e.g. total execution
1084        time of each Git command.
1085        See `GIT_TRACE` for available trace output options.
1086
1087`GIT_TRACE_SETUP`::
1088        Enables trace messages printing the .git, working tree and current
1089        working directory after Git has completed its setup phase.
1090        See `GIT_TRACE` for available trace output options.
1091
1092`GIT_TRACE_SHALLOW`::
1093        Enables trace messages that can help debugging fetching /
1094        cloning of shallow repositories.
1095        See `GIT_TRACE` for available trace output options.
1096
1097`GIT_LITERAL_PATHSPECS`::
1098        Setting this variable to `1` will cause Git to treat all
1099        pathspecs literally, rather than as glob patterns. For example,
1100        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1101        for commits that touch the path `*.c`, not any paths that the
1102        glob `*.c` matches. You might want this if you are feeding
1103        literal paths to Git (e.g., paths previously given to you by
1104        `git ls-tree`, `--raw` diff output, etc).
1105
1106`GIT_GLOB_PATHSPECS`::
1107        Setting this variable to `1` will cause Git to treat all
1108        pathspecs as glob patterns (aka "glob" magic).
1109
1110`GIT_NOGLOB_PATHSPECS`::
1111        Setting this variable to `1` will cause Git to treat all
1112        pathspecs as literal (aka "literal" magic).
1113
1114`GIT_ICASE_PATHSPECS`::
1115        Setting this variable to `1` will cause Git to treat all
1116        pathspecs as case-insensitive.
1117
1118`GIT_REFLOG_ACTION`::
1119        When a ref is updated, reflog entries are created to keep
1120        track of the reason why the ref was updated (which is
1121        typically the name of the high-level command that updated
1122        the ref), in addition to the old and new values of the ref.
1123        A scripted Porcelain command can use set_reflog_action
1124        helper function in `git-sh-setup` to set its name to this
1125        variable when it is invoked as the top level command by the
1126        end user, to be recorded in the body of the reflog.
1127
1128`GIT_REF_PARANOIA`::
1129        If set to `1`, include broken or badly named refs when iterating
1130        over lists of refs. In a normal, non-corrupted repository, this
1131        does nothing. However, enabling it may help git to detect and
1132        abort some operations in the presence of broken refs. Git sets
1133        this variable automatically when performing destructive
1134        operations like linkgit:git-prune[1]. You should not need to set
1135        it yourself unless you want to be paranoid about making sure
1136        an operation has touched every ref (e.g., because you are
1137        cloning a repository to make a backup).
1138
1139`GIT_ALLOW_PROTOCOL`::
1140        If set, provide a colon-separated list of protocols which are
1141        allowed to be used with fetch/push/clone. This is useful to
1142        restrict recursive submodule initialization from an untrusted
1143        repository. Any protocol not mentioned will be disallowed (i.e.,
1144        this is a whitelist, not a blacklist). If the variable is not
1145        set at all, all protocols are enabled.  The protocol names
1146        currently used by git are:
1147
1148          - `file`: any local file-based path (including `file://` URLs,
1149            or local paths)
1150
1151          - `git`: the anonymous git protocol over a direct TCP
1152            connection (or proxy, if configured)
1153
1154          - `ssh`: git over ssh (including `host:path` syntax,
1155            `ssh://`, etc).
1156
1157          - `http`: git over http, both "smart http" and "dumb http".
1158            Note that this does _not_ include `https`; if you want both,
1159            you should specify both as `http:https`.
1160
1161          - any external helpers are named by their protocol (e.g., use
1162            `hg` to allow the `git-remote-hg` helper)
1163
1164
1165Discussion[[Discussion]]
1166------------------------
1167
1168More detail on the following is available from the
1169link:user-manual.html#git-concepts[Git concepts chapter of the
1170user-manual] and linkgit:gitcore-tutorial[7].
1171
1172A Git project normally consists of a working directory with a ".git"
1173subdirectory at the top level.  The .git directory contains, among other
1174things, a compressed object database representing the complete history
1175of the project, an "index" file which links that history to the current
1176contents of the working tree, and named pointers into that history such
1177as tags and branch heads.
1178
1179The object database contains objects of three main types: blobs, which
1180hold file data; trees, which point to blobs and other trees to build up
1181directory hierarchies; and commits, which each reference a single tree
1182and some number of parent commits.
1183
1184The commit, equivalent to what other systems call a "changeset" or
1185"version", represents a step in the project's history, and each parent
1186represents an immediately preceding step.  Commits with more than one
1187parent represent merges of independent lines of development.
1188
1189All objects are named by the SHA-1 hash of their contents, normally
1190written as a string of 40 hex digits.  Such names are globally unique.
1191The entire history leading up to a commit can be vouched for by signing
1192just that commit.  A fourth object type, the tag, is provided for this
1193purpose.
1194
1195When first created, objects are stored in individual files, but for
1196efficiency may later be compressed together into "pack files".
1197
1198Named pointers called refs mark interesting points in history.  A ref
1199may contain the SHA-1 name of an object or the name of another ref.  Refs
1200with names beginning `ref/head/` contain the SHA-1 name of the most
1201recent commit (or "head") of a branch under development.  SHA-1 names of
1202tags of interest are stored under `ref/tags/`.  A special ref named
1203`HEAD` contains the name of the currently checked-out branch.
1204
1205The index file is initialized with a list of all paths and, for each
1206path, a blob object and a set of attributes.  The blob object represents
1207the contents of the file as of the head of the current branch.  The
1208attributes (last modified time, size, etc.) are taken from the
1209corresponding file in the working tree.  Subsequent changes to the
1210working tree can be found by comparing these attributes.  The index may
1211be updated with new content, and new commits may be created from the
1212content stored in the index.
1213
1214The index is also capable of storing multiple entries (called "stages")
1215for a given pathname.  These stages are used to hold the various
1216unmerged version of a file when a merge is in progress.
1217
1218FURTHER DOCUMENTATION
1219---------------------
1220
1221See the references in the "description" section to get started
1222using Git.  The following is probably more detail than necessary
1223for a first-time user.
1224
1225The link:user-manual.html#git-concepts[Git concepts chapter of the
1226user-manual] and linkgit:gitcore-tutorial[7] both provide
1227introductions to the underlying Git architecture.
1228
1229See linkgit:gitworkflows[7] for an overview of recommended workflows.
1230
1231See also the link:howto-index.html[howto] documents for some useful
1232examples.
1233
1234The internals are documented in the
1235link:technical/api-index.html[Git API documentation].
1236
1237Users migrating from CVS may also want to
1238read linkgit:gitcvs-migration[7].
1239
1240
1241Authors
1242-------
1243Git was started by Linus Torvalds, and is currently maintained by Junio
1244C Hamano. Numerous contributions have come from the Git mailing list
1245<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1246gives you a more complete list of contributors.
1247
1248If you have a clone of git.git itself, the
1249output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1250the authors for specific parts of the project.
1251
1252Reporting Bugs
1253--------------
1254
1255Report bugs to the Git mailing list <git@vger.kernel.org> where the
1256development and maintenance is primarily done.  You do not have to be
1257subscribed to the list to send a message there.
1258
1259SEE ALSO
1260--------
1261linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1262linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1263linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1264linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1265linkgit:gitworkflows[7]
1266
1267GIT
1268---
1269Part of the linkgit:git[1] suite