Documentation / git.txton commit Merge branch 'sg/t6050-failing-editor-test-fix' into maint (0298675)
   1git(1)
   2======
   3
   4NAME
   5----
   6git - the stupid content tracker
   7
   8
   9SYNOPSIS
  10--------
  11[verse]
  12'git' [--version] [--help] [-C <path>] [-c <name>=<value>]
  13    [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
  14    [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
  15    [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
  16    <command> [<args>]
  17
  18DESCRIPTION
  19-----------
  20Git is a fast, scalable, distributed revision control system with an
  21unusually rich command set that provides both high-level operations
  22and full access to internals.
  23
  24See linkgit:gittutorial[7] to get started, then see
  25linkgit:giteveryday[7] for a useful minimum set of
  26commands.  The link:user-manual.html[Git User's Manual] has a more
  27in-depth introduction.
  28
  29After you mastered the basic concepts, you can come back to this
  30page to learn what commands Git offers.  You can learn more about
  31individual Git commands with "git help command".  linkgit:gitcli[7]
  32manual page gives you an overview of the command-line command syntax.
  33
  34Formatted and hyperlinked version of the latest Git documentation
  35can be viewed at `http://git-htmldocs.googlecode.com/git/git.html`.
  36
  37ifdef::stalenotes[]
  38[NOTE]
  39============
  40
  41You are reading the documentation for the latest (possibly
  42unreleased) version of Git, that is available from the 'master'
  43branch of the `git.git` repository.
  44Documentation for older releases are available here:
  45
  46* link:v2.7.0/git.html[documentation for release 2.7]
  47
  48* release notes for
  49  link:RelNotes/2.7.0.txt[2.7].
  50
  51* link:v2.6.5/git.html[documentation for release 2.6.5]
  52
  53* release notes for
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  55  link:RelNotes/2.6.4.txt[2.6.4],
  56  link:RelNotes/2.6.3.txt[2.6.3],
  57  link:RelNotes/2.6.2.txt[2.6.2],
  58  link:RelNotes/2.6.1.txt[2.6.1],
  59  link:RelNotes/2.6.0.txt[2.6].
  60
  61* link:v2.5.4/git.html[documentation for release 2.5.4]
  62
  63* release notes for
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  65  link:RelNotes/2.5.3.txt[2.5.3],
  66  link:RelNotes/2.5.2.txt[2.5.2],
  67  link:RelNotes/2.5.1.txt[2.5.1],
  68  link:RelNotes/2.5.0.txt[2.5].
  69
  70* link:v2.4.10/git.html[documentation for release 2.4.10]
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  84
  85* link:v2.3.10/git.html[documentation for release 2.3.10]
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 427  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 428  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 429  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 430  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 431  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 432  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 433  link:RelNotes/1.5.4.txt[1.5.4].
 434
 435* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 436
 437* release notes for
 438  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 439  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 440  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 441  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 442  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 443  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 444  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 445  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 446  link:RelNotes/1.5.3.txt[1.5.3].
 447
 448* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 449
 450* release notes for
 451  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 452  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 453  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 454  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 455  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 456  link:RelNotes/1.5.2.txt[1.5.2].
 457
 458* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 459
 460* release notes for
 461  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 462  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 463  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 464  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 465  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 466  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 467  link:RelNotes/1.5.1.txt[1.5.1].
 468
 469* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 470
 471* release notes for
 472  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 473  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 474  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 475  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 476  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 477  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 478  link:RelNotes/1.5.0.txt[1.5.0].
 479
 480* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 481  link:v1.3.3/git.html[1.3.3],
 482  link:v1.2.6/git.html[1.2.6],
 483  link:v1.0.13/git.html[1.0.13].
 484
 485============
 486
 487endif::stalenotes[]
 488
 489OPTIONS
 490-------
 491--version::
 492        Prints the Git suite version that the 'git' program came from.
 493
 494--help::
 495        Prints the synopsis and a list of the most commonly used
 496        commands. If the option '--all' or '-a' is given then all
 497        available commands are printed. If a Git command is named this
 498        option will bring up the manual page for that command.
 499+
 500Other options are available to control how the manual page is
 501displayed. See linkgit:git-help[1] for more information,
 502because `git --help ...` is converted internally into `git
 503help ...`.
 504
 505-C <path>::
 506        Run as if git was started in '<path>' instead of the current working
 507        directory.  When multiple `-C` options are given, each subsequent
 508        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 509        <path>`.
 510+
 511This option affects options that expect path name like `--git-dir` and
 512`--work-tree` in that their interpretations of the path names would be
 513made relative to the working directory caused by the `-C` option. For
 514example the following invocations are equivalent:
 515
 516    git --git-dir=a.git --work-tree=b -C c status
 517    git --git-dir=c/a.git --work-tree=c/b status
 518
 519-c <name>=<value>::
 520        Pass a configuration parameter to the command. The value
 521        given will override values from configuration files.
 522        The <name> is expected in the same format as listed by
 523        'git config' (subkeys separated by dots).
 524+
 525Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 526`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 527config file). Including the equals but with an empty value (like `git -c
 528foo.bar= ...`) sets `foo.bar` to the empty string.
 529
 530--exec-path[=<path>]::
 531        Path to wherever your core Git programs are installed.
 532        This can also be controlled by setting the GIT_EXEC_PATH
 533        environment variable. If no path is given, 'git' will print
 534        the current setting and then exit.
 535
 536--html-path::
 537        Print the path, without trailing slash, where Git's HTML
 538        documentation is installed and exit.
 539
 540--man-path::
 541        Print the manpath (see `man(1)`) for the man pages for
 542        this version of Git and exit.
 543
 544--info-path::
 545        Print the path where the Info files documenting this
 546        version of Git are installed and exit.
 547
 548-p::
 549--paginate::
 550        Pipe all output into 'less' (or if set, $PAGER) if standard
 551        output is a terminal.  This overrides the `pager.<cmd>`
 552        configuration options (see the "Configuration Mechanism" section
 553        below).
 554
 555--no-pager::
 556        Do not pipe Git output into a pager.
 557
 558--git-dir=<path>::
 559        Set the path to the repository. This can also be controlled by
 560        setting the GIT_DIR environment variable. It can be an absolute
 561        path or relative path to current working directory.
 562
 563--work-tree=<path>::
 564        Set the path to the working tree. It can be an absolute path
 565        or a path relative to the current working directory.
 566        This can also be controlled by setting the GIT_WORK_TREE
 567        environment variable and the core.worktree configuration
 568        variable (see core.worktree in linkgit:git-config[1] for a
 569        more detailed discussion).
 570
 571--namespace=<path>::
 572        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 573        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 574        variable.
 575
 576--bare::
 577        Treat the repository as a bare repository.  If GIT_DIR
 578        environment is not set, it is set to the current working
 579        directory.
 580
 581--no-replace-objects::
 582        Do not use replacement refs to replace Git objects. See
 583        linkgit:git-replace[1] for more information.
 584
 585--literal-pathspecs::
 586        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 587        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 588        variable to `1`.
 589
 590--glob-pathspecs::
 591        Add "glob" magic to all pathspec. This is equivalent to setting
 592        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 593        globbing on individual pathspecs can be done using pathspec
 594        magic ":(literal)"
 595
 596--noglob-pathspecs::
 597        Add "literal" magic to all pathspec. This is equivalent to setting
 598        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 599        globbing on individual pathspecs can be done using pathspec
 600        magic ":(glob)"
 601
 602--icase-pathspecs::
 603        Add "icase" magic to all pathspec. This is equivalent to setting
 604        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 605
 606GIT COMMANDS
 607------------
 608
 609We divide Git into high level ("porcelain") commands and low level
 610("plumbing") commands.
 611
 612High-level commands (porcelain)
 613-------------------------------
 614
 615We separate the porcelain commands into the main commands and some
 616ancillary user utilities.
 617
 618Main porcelain commands
 619~~~~~~~~~~~~~~~~~~~~~~~
 620
 621include::cmds-mainporcelain.txt[]
 622
 623Ancillary Commands
 624~~~~~~~~~~~~~~~~~~
 625Manipulators:
 626
 627include::cmds-ancillarymanipulators.txt[]
 628
 629Interrogators:
 630
 631include::cmds-ancillaryinterrogators.txt[]
 632
 633
 634Interacting with Others
 635~~~~~~~~~~~~~~~~~~~~~~~
 636
 637These commands are to interact with foreign SCM and with other
 638people via patch over e-mail.
 639
 640include::cmds-foreignscminterface.txt[]
 641
 642
 643Low-level commands (plumbing)
 644-----------------------------
 645
 646Although Git includes its
 647own porcelain layer, its low-level commands are sufficient to support
 648development of alternative porcelains.  Developers of such porcelains
 649might start by reading about linkgit:git-update-index[1] and
 650linkgit:git-read-tree[1].
 651
 652The interface (input, output, set of options and the semantics)
 653to these low-level commands are meant to be a lot more stable
 654than Porcelain level commands, because these commands are
 655primarily for scripted use.  The interface to Porcelain commands
 656on the other hand are subject to change in order to improve the
 657end user experience.
 658
 659The following description divides
 660the low-level commands into commands that manipulate objects (in
 661the repository, index, and working tree), commands that interrogate and
 662compare objects, and commands that move objects and references between
 663repositories.
 664
 665
 666Manipulation commands
 667~~~~~~~~~~~~~~~~~~~~~
 668
 669include::cmds-plumbingmanipulators.txt[]
 670
 671
 672Interrogation commands
 673~~~~~~~~~~~~~~~~~~~~~~
 674
 675include::cmds-plumbinginterrogators.txt[]
 676
 677In general, the interrogate commands do not touch the files in
 678the working tree.
 679
 680
 681Synching repositories
 682~~~~~~~~~~~~~~~~~~~~~
 683
 684include::cmds-synchingrepositories.txt[]
 685
 686The following are helper commands used by the above; end users
 687typically do not use them directly.
 688
 689include::cmds-synchelpers.txt[]
 690
 691
 692Internal helper commands
 693~~~~~~~~~~~~~~~~~~~~~~~~
 694
 695These are internal helper commands used by other commands; end
 696users typically do not use them directly.
 697
 698include::cmds-purehelpers.txt[]
 699
 700
 701Configuration Mechanism
 702-----------------------
 703
 704Git uses a simple text format to store customizations that are per
 705repository and are per user.  Such a configuration file may look
 706like this:
 707
 708------------
 709#
 710# A '#' or ';' character indicates a comment.
 711#
 712
 713; core variables
 714[core]
 715        ; Don't trust file modes
 716        filemode = false
 717
 718; user identity
 719[user]
 720        name = "Junio C Hamano"
 721        email = "gitster@pobox.com"
 722
 723------------
 724
 725Various commands read from the configuration file and adjust
 726their operation accordingly.  See linkgit:git-config[1] for a
 727list and more details about the configuration mechanism.
 728
 729
 730Identifier Terminology
 731----------------------
 732<object>::
 733        Indicates the object name for any type of object.
 734
 735<blob>::
 736        Indicates a blob object name.
 737
 738<tree>::
 739        Indicates a tree object name.
 740
 741<commit>::
 742        Indicates a commit object name.
 743
 744<tree-ish>::
 745        Indicates a tree, commit or tag object name.  A
 746        command that takes a <tree-ish> argument ultimately wants to
 747        operate on a <tree> object but automatically dereferences
 748        <commit> and <tag> objects that point at a <tree>.
 749
 750<commit-ish>::
 751        Indicates a commit or tag object name.  A
 752        command that takes a <commit-ish> argument ultimately wants to
 753        operate on a <commit> object but automatically dereferences
 754        <tag> objects that point at a <commit>.
 755
 756<type>::
 757        Indicates that an object type is required.
 758        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 759
 760<file>::
 761        Indicates a filename - almost always relative to the
 762        root of the tree structure `GIT_INDEX_FILE` describes.
 763
 764Symbolic Identifiers
 765--------------------
 766Any Git command accepting any <object> can also use the following
 767symbolic notation:
 768
 769HEAD::
 770        indicates the head of the current branch.
 771
 772<tag>::
 773        a valid tag 'name'
 774        (i.e. a `refs/tags/<tag>` reference).
 775
 776<head>::
 777        a valid head 'name'
 778        (i.e. a `refs/heads/<head>` reference).
 779
 780For a more complete list of ways to spell object names, see
 781"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 782
 783
 784File/Directory Structure
 785------------------------
 786
 787Please see the linkgit:gitrepository-layout[5] document.
 788
 789Read linkgit:githooks[5] for more details about each hook.
 790
 791Higher level SCMs may provide and manage additional information in the
 792`$GIT_DIR`.
 793
 794
 795Terminology
 796-----------
 797Please see linkgit:gitglossary[7].
 798
 799
 800Environment Variables
 801---------------------
 802Various Git commands use the following environment variables:
 803
 804The Git Repository
 805~~~~~~~~~~~~~~~~~~
 806These environment variables apply to 'all' core Git commands. Nb: it
 807is worth noting that they may be used/overridden by SCMS sitting above
 808Git so take care if using a foreign front-end.
 809
 810'GIT_INDEX_FILE'::
 811        This environment allows the specification of an alternate
 812        index file. If not specified, the default of `$GIT_DIR/index`
 813        is used.
 814
 815'GIT_INDEX_VERSION'::
 816        This environment variable allows the specification of an index
 817        version for new repositories.  It won't affect existing index
 818        files.  By default index file version 2 or 3 is used. See
 819        linkgit:git-update-index[1] for more information.
 820
 821'GIT_OBJECT_DIRECTORY'::
 822        If the object storage directory is specified via this
 823        environment variable then the sha1 directories are created
 824        underneath - otherwise the default `$GIT_DIR/objects`
 825        directory is used.
 826
 827'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 828        Due to the immutable nature of Git objects, old objects can be
 829        archived into shared, read-only directories. This variable
 830        specifies a ":" separated (on Windows ";" separated) list
 831        of Git object directories which can be used to search for Git
 832        objects. New objects will not be written to these directories.
 833
 834'GIT_DIR'::
 835        If the 'GIT_DIR' environment variable is set then it
 836        specifies a path to use instead of the default `.git`
 837        for the base of the repository.
 838        The '--git-dir' command-line option also sets this value.
 839
 840'GIT_WORK_TREE'::
 841        Set the path to the root of the working tree.
 842        This can also be controlled by the '--work-tree' command-line
 843        option and the core.worktree configuration variable.
 844
 845'GIT_NAMESPACE'::
 846        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 847        The '--namespace' command-line option also sets this value.
 848
 849'GIT_CEILING_DIRECTORIES'::
 850        This should be a colon-separated list of absolute paths.  If
 851        set, it is a list of directories that Git should not chdir up
 852        into while looking for a repository directory (useful for
 853        excluding slow-loading network directories).  It will not
 854        exclude the current working directory or a GIT_DIR set on the
 855        command line or in the environment.  Normally, Git has to read
 856        the entries in this list and resolve any symlink that
 857        might be present in order to compare them with the current
 858        directory.  However, if even this access is slow, you
 859        can add an empty entry to the list to tell Git that the
 860        subsequent entries are not symlinks and needn't be resolved;
 861        e.g.,
 862        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 863
 864'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 865        When run in a directory that does not have ".git" repository
 866        directory, Git tries to find such a directory in the parent
 867        directories to find the top of the working tree, but by default it
 868        does not cross filesystem boundaries.  This environment variable
 869        can be set to true to tell Git not to stop at filesystem
 870        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 871        an explicit repository directory set via 'GIT_DIR' or on the
 872        command line.
 873
 874'GIT_COMMON_DIR'::
 875        If this variable is set to a path, non-worktree files that are
 876        normally in $GIT_DIR will be taken from this path
 877        instead. Worktree-specific files such as HEAD or index are
 878        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 879        linkgit:git-worktree[1] for
 880        details. This variable has lower precedence than other path
 881        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 882
 883Git Commits
 884~~~~~~~~~~~
 885'GIT_AUTHOR_NAME'::
 886'GIT_AUTHOR_EMAIL'::
 887'GIT_AUTHOR_DATE'::
 888'GIT_COMMITTER_NAME'::
 889'GIT_COMMITTER_EMAIL'::
 890'GIT_COMMITTER_DATE'::
 891'EMAIL'::
 892        see linkgit:git-commit-tree[1]
 893
 894Git Diffs
 895~~~~~~~~~
 896'GIT_DIFF_OPTS'::
 897        Only valid setting is "--unified=??" or "-u??" to set the
 898        number of context lines shown when a unified diff is created.
 899        This takes precedence over any "-U" or "--unified" option
 900        value passed on the Git diff command line.
 901
 902'GIT_EXTERNAL_DIFF'::
 903        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 904        program named by it is called, instead of the diff invocation
 905        described above.  For a path that is added, removed, or modified,
 906        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 907
 908        path old-file old-hex old-mode new-file new-hex new-mode
 909+
 910where:
 911
 912        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 913                         contents of <old|new>,
 914        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 915        <old|new>-mode:: are the octal representation of the file modes.
 916+
 917The file parameters can point at the user's working file
 918(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 919when a new file is added), or a temporary file (e.g. `old-file` in the
 920index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 921temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 922+
 923For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 924parameter, <path>.
 925+
 926For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 927'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 928
 929'GIT_DIFF_PATH_COUNTER'::
 930        A 1-based counter incremented by one for every path.
 931
 932'GIT_DIFF_PATH_TOTAL'::
 933        The total number of paths.
 934
 935other
 936~~~~~
 937'GIT_MERGE_VERBOSITY'::
 938        A number controlling the amount of output shown by
 939        the recursive merge strategy.  Overrides merge.verbosity.
 940        See linkgit:git-merge[1]
 941
 942'GIT_PAGER'::
 943        This environment variable overrides `$PAGER`. If it is set
 944        to an empty string or to the value "cat", Git will not launch
 945        a pager.  See also the `core.pager` option in
 946        linkgit:git-config[1].
 947
 948'GIT_EDITOR'::
 949        This environment variable overrides `$EDITOR` and `$VISUAL`.
 950        It is used by several Git commands when, on interactive mode,
 951        an editor is to be launched. See also linkgit:git-var[1]
 952        and the `core.editor` option in linkgit:git-config[1].
 953
 954'GIT_SSH'::
 955'GIT_SSH_COMMAND'::
 956        If either of these environment variables is set then 'git fetch'
 957        and 'git push' will use the specified command instead of 'ssh'
 958        when they need to connect to a remote system.
 959        The command will be given exactly two or four arguments: the
 960        'username@host' (or just 'host') from the URL and the shell
 961        command to execute on that remote system, optionally preceded by
 962        '-p' (literally) and the 'port' from the URL when it specifies
 963        something other than the default SSH port.
 964+
 965`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 966by the shell, which allows additional arguments to be included.
 967`$GIT_SSH` on the other hand must be just the path to a program
 968(which can be a wrapper shell script, if additional arguments are
 969needed).
 970+
 971Usually it is easier to configure any desired options through your
 972personal `.ssh/config` file.  Please consult your ssh documentation
 973for further details.
 974
 975'GIT_ASKPASS'::
 976        If this environment variable is set, then Git commands which need to
 977        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 978        will call this program with a suitable prompt as command-line argument
 979        and read the password from its STDOUT. See also the 'core.askPass'
 980        option in linkgit:git-config[1].
 981
 982'GIT_TERMINAL_PROMPT'::
 983        If this environment variable is set to `0`, git will not prompt
 984        on the terminal (e.g., when asking for HTTP authentication).
 985
 986'GIT_CONFIG_NOSYSTEM'::
 987        Whether to skip reading settings from the system-wide
 988        `$(prefix)/etc/gitconfig` file.  This environment variable can
 989        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 990        predictable environment for a picky script, or you can set it
 991        temporarily to avoid using a buggy `/etc/gitconfig` file while
 992        waiting for someone with sufficient permissions to fix it.
 993
 994'GIT_FLUSH'::
 995        If this environment variable is set to "1", then commands such
 996        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 997        'git check-attr' and 'git check-ignore' will
 998        force a flush of the output stream after each record have been
 999        flushed. If this
1000        variable is set to "0", the output of these commands will be done
1001        using completely buffered I/O.   If this environment variable is
1002        not set, Git will choose buffered or record-oriented flushing
1003        based on whether stdout appears to be redirected to a file or not.
1004
1005'GIT_TRACE'::
1006        Enables general trace messages, e.g. alias expansion, built-in
1007        command execution and external command execution.
1008+
1009If this variable is set to "1", "2" or "true" (comparison
1010is case insensitive), trace messages will be printed to
1011stderr.
1012+
1013If the variable is set to an integer value greater than 2
1014and lower than 10 (strictly) then Git will interpret this
1015value as an open file descriptor and will try to write the
1016trace messages into this file descriptor.
1017+
1018Alternatively, if the variable is set to an absolute path
1019(starting with a '/' character), Git will interpret this
1020as a file path and will try to write the trace messages
1021into it.
1022+
1023Unsetting the variable, or setting it to empty, "0" or
1024"false" (case insensitive) disables trace messages.
1025
1026'GIT_TRACE_PACK_ACCESS'::
1027        Enables trace messages for all accesses to any packs. For each
1028        access, the pack file name and an offset in the pack is
1029        recorded. This may be helpful for troubleshooting some
1030        pack-related performance problems.
1031        See 'GIT_TRACE' for available trace output options.
1032
1033'GIT_TRACE_PACKET'::
1034        Enables trace messages for all packets coming in or out of a
1035        given program. This can help with debugging object negotiation
1036        or other protocol issues. Tracing is turned off at a packet
1037        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1038        See 'GIT_TRACE' for available trace output options.
1039
1040'GIT_TRACE_PACKFILE'::
1041        Enables tracing of packfiles sent or received by a
1042        given program. Unlike other trace output, this trace is
1043        verbatim: no headers, and no quoting of binary data. You almost
1044        certainly want to direct into a file (e.g.,
1045        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1046        the terminal or mixing it with other trace output.
1047+
1048Note that this is currently only implemented for the client side
1049of clones and fetches.
1050
1051'GIT_TRACE_PERFORMANCE'::
1052        Enables performance related trace messages, e.g. total execution
1053        time of each Git command.
1054        See 'GIT_TRACE' for available trace output options.
1055
1056'GIT_TRACE_SETUP'::
1057        Enables trace messages printing the .git, working tree and current
1058        working directory after Git has completed its setup phase.
1059        See 'GIT_TRACE' for available trace output options.
1060
1061'GIT_TRACE_SHALLOW'::
1062        Enables trace messages that can help debugging fetching /
1063        cloning of shallow repositories.
1064        See 'GIT_TRACE' for available trace output options.
1065
1066'GIT_LITERAL_PATHSPECS'::
1067        Setting this variable to `1` will cause Git to treat all
1068        pathspecs literally, rather than as glob patterns. For example,
1069        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1070        for commits that touch the path `*.c`, not any paths that the
1071        glob `*.c` matches. You might want this if you are feeding
1072        literal paths to Git (e.g., paths previously given to you by
1073        `git ls-tree`, `--raw` diff output, etc).
1074
1075'GIT_GLOB_PATHSPECS'::
1076        Setting this variable to `1` will cause Git to treat all
1077        pathspecs as glob patterns (aka "glob" magic).
1078
1079'GIT_NOGLOB_PATHSPECS'::
1080        Setting this variable to `1` will cause Git to treat all
1081        pathspecs as literal (aka "literal" magic).
1082
1083'GIT_ICASE_PATHSPECS'::
1084        Setting this variable to `1` will cause Git to treat all
1085        pathspecs as case-insensitive.
1086
1087'GIT_REFLOG_ACTION'::
1088        When a ref is updated, reflog entries are created to keep
1089        track of the reason why the ref was updated (which is
1090        typically the name of the high-level command that updated
1091        the ref), in addition to the old and new values of the ref.
1092        A scripted Porcelain command can use set_reflog_action
1093        helper function in `git-sh-setup` to set its name to this
1094        variable when it is invoked as the top level command by the
1095        end user, to be recorded in the body of the reflog.
1096
1097'GIT_REF_PARANOIA'::
1098        If set to `1`, include broken or badly named refs when iterating
1099        over lists of refs. In a normal, non-corrupted repository, this
1100        does nothing. However, enabling it may help git to detect and
1101        abort some operations in the presence of broken refs. Git sets
1102        this variable automatically when performing destructive
1103        operations like linkgit:git-prune[1]. You should not need to set
1104        it yourself unless you want to be paranoid about making sure
1105        an operation has touched every ref (e.g., because you are
1106        cloning a repository to make a backup).
1107
1108'GIT_ALLOW_PROTOCOL'::
1109        If set, provide a colon-separated list of protocols which are
1110        allowed to be used with fetch/push/clone. This is useful to
1111        restrict recursive submodule initialization from an untrusted
1112        repository. Any protocol not mentioned will be disallowed (i.e.,
1113        this is a whitelist, not a blacklist). If the variable is not
1114        set at all, all protocols are enabled.  The protocol names
1115        currently used by git are:
1116
1117          - `file`: any local file-based path (including `file://` URLs,
1118            or local paths)
1119
1120          - `git`: the anonymous git protocol over a direct TCP
1121            connection (or proxy, if configured)
1122
1123          - `ssh`: git over ssh (including `host:path` syntax,
1124            `git+ssh://`, etc).
1125
1126          - `rsync`: git over rsync
1127
1128          - `http`: git over http, both "smart http" and "dumb http".
1129            Note that this does _not_ include `https`; if you want both,
1130            you should specify both as `http:https`.
1131
1132          - any external helpers are named by their protocol (e.g., use
1133            `hg` to allow the `git-remote-hg` helper)
1134
1135
1136Discussion[[Discussion]]
1137------------------------
1138
1139More detail on the following is available from the
1140link:user-manual.html#git-concepts[Git concepts chapter of the
1141user-manual] and linkgit:gitcore-tutorial[7].
1142
1143A Git project normally consists of a working directory with a ".git"
1144subdirectory at the top level.  The .git directory contains, among other
1145things, a compressed object database representing the complete history
1146of the project, an "index" file which links that history to the current
1147contents of the working tree, and named pointers into that history such
1148as tags and branch heads.
1149
1150The object database contains objects of three main types: blobs, which
1151hold file data; trees, which point to blobs and other trees to build up
1152directory hierarchies; and commits, which each reference a single tree
1153and some number of parent commits.
1154
1155The commit, equivalent to what other systems call a "changeset" or
1156"version", represents a step in the project's history, and each parent
1157represents an immediately preceding step.  Commits with more than one
1158parent represent merges of independent lines of development.
1159
1160All objects are named by the SHA-1 hash of their contents, normally
1161written as a string of 40 hex digits.  Such names are globally unique.
1162The entire history leading up to a commit can be vouched for by signing
1163just that commit.  A fourth object type, the tag, is provided for this
1164purpose.
1165
1166When first created, objects are stored in individual files, but for
1167efficiency may later be compressed together into "pack files".
1168
1169Named pointers called refs mark interesting points in history.  A ref
1170may contain the SHA-1 name of an object or the name of another ref.  Refs
1171with names beginning `ref/head/` contain the SHA-1 name of the most
1172recent commit (or "head") of a branch under development.  SHA-1 names of
1173tags of interest are stored under `ref/tags/`.  A special ref named
1174`HEAD` contains the name of the currently checked-out branch.
1175
1176The index file is initialized with a list of all paths and, for each
1177path, a blob object and a set of attributes.  The blob object represents
1178the contents of the file as of the head of the current branch.  The
1179attributes (last modified time, size, etc.) are taken from the
1180corresponding file in the working tree.  Subsequent changes to the
1181working tree can be found by comparing these attributes.  The index may
1182be updated with new content, and new commits may be created from the
1183content stored in the index.
1184
1185The index is also capable of storing multiple entries (called "stages")
1186for a given pathname.  These stages are used to hold the various
1187unmerged version of a file when a merge is in progress.
1188
1189FURTHER DOCUMENTATION
1190---------------------
1191
1192See the references in the "description" section to get started
1193using Git.  The following is probably more detail than necessary
1194for a first-time user.
1195
1196The link:user-manual.html#git-concepts[Git concepts chapter of the
1197user-manual] and linkgit:gitcore-tutorial[7] both provide
1198introductions to the underlying Git architecture.
1199
1200See linkgit:gitworkflows[7] for an overview of recommended workflows.
1201
1202See also the link:howto-index.html[howto] documents for some useful
1203examples.
1204
1205The internals are documented in the
1206link:technical/api-index.html[Git API documentation].
1207
1208Users migrating from CVS may also want to
1209read linkgit:gitcvs-migration[7].
1210
1211
1212Authors
1213-------
1214Git was started by Linus Torvalds, and is currently maintained by Junio
1215C Hamano. Numerous contributions have come from the Git mailing list
1216<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1217gives you a more complete list of contributors.
1218
1219If you have a clone of git.git itself, the
1220output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1221the authors for specific parts of the project.
1222
1223Reporting Bugs
1224--------------
1225
1226Report bugs to the Git mailing list <git@vger.kernel.org> where the
1227development and maintenance is primarily done.  You do not have to be
1228subscribed to the list to send a message there.
1229
1230SEE ALSO
1231--------
1232linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1233linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1234linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1235linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1236linkgit:gitworkflows[7]
1237
1238GIT
1239---
1240Part of the linkgit:git[1] suite