Documentation / git.txton commit Merge branch 'js/commit-gpgsign' of ../git-gui into js/git-gui-commit-gpgsign (f14a310)
   1git(1)
   2======
   3
   4NAME
   5----
   6git - the stupid content tracker
   7
   8
   9SYNOPSIS
  10--------
  11[verse]
  12'git' [--version] [--help] [-C <path>] [-c <name>=<value>]
  13    [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
  14    [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
  15    [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
  16    <command> [<args>]
  17
  18DESCRIPTION
  19-----------
  20Git is a fast, scalable, distributed revision control system with an
  21unusually rich command set that provides both high-level operations
  22and full access to internals.
  23
  24See linkgit:gittutorial[7] to get started, then see
  25linkgit:giteveryday[7] for a useful minimum set of
  26commands.  The link:user-manual.html[Git User's Manual] has a more
  27in-depth introduction.
  28
  29After you mastered the basic concepts, you can come back to this
  30page to learn what commands Git offers.  You can learn more about
  31individual Git commands with "git help command".  linkgit:gitcli[7]
  32manual page gives you an overview of the command-line command syntax.
  33
  34A formatted and hyperlinked copy of the latest Git documentation
  35can be viewed at `https://git.github.io/htmldocs/git.html`.
  36
  37ifdef::stalenotes[]
  38[NOTE]
  39============
  40
  41You are reading the documentation for the latest (possibly
  42unreleased) version of Git, that is available from the 'master'
  43branch of the `git.git` repository.
  44Documentation for older releases are available here:
  45
  46* link:v2.9.3/git.html[documentation for release 2.9.3]
  47
  48* release notes for
  49  link:RelNotes/2.9.3.txt[2.9.3],
  50  link:RelNotes/2.9.2.txt[2.9.2],
  51  link:RelNotes/2.9.1.txt[2.9.1],
  52  link:RelNotes/2.9.0.txt[2.9].
  53
  54* link:v2.8.4/git.html[documentation for release 2.8.4]
  55
  56* release notes for
  57  link:RelNotes/2.8.4.txt[2.8.4],
  58  link:RelNotes/2.8.3.txt[2.8.3],
  59  link:RelNotes/2.8.2.txt[2.8.2],
  60  link:RelNotes/2.8.1.txt[2.8.1],
  61  link:RelNotes/2.8.0.txt[2.8].
  62
  63* link:v2.7.3/git.html[documentation for release 2.7.3]
  64
  65* release notes for
  66  link:RelNotes/2.7.3.txt[2.7.3],
  67  link:RelNotes/2.7.2.txt[2.7.2],
  68  link:RelNotes/2.7.1.txt[2.7.1],
  69  link:RelNotes/2.7.0.txt[2.7].
  70
  71* link:v2.6.6/git.html[documentation for release 2.6.6]
  72
  73* release notes for
  74  link:RelNotes/2.6.6.txt[2.6.6],
  75  link:RelNotes/2.6.5.txt[2.6.5],
  76  link:RelNotes/2.6.4.txt[2.6.4],
  77  link:RelNotes/2.6.3.txt[2.6.3],
  78  link:RelNotes/2.6.2.txt[2.6.2],
  79  link:RelNotes/2.6.1.txt[2.6.1],
  80  link:RelNotes/2.6.0.txt[2.6].
  81
  82* link:v2.5.5/git.html[documentation for release 2.5.5]
  83
  84* release notes for
  85  link:RelNotes/2.5.5.txt[2.5.5],
  86  link:RelNotes/2.5.4.txt[2.5.4],
  87  link:RelNotes/2.5.3.txt[2.5.3],
  88  link:RelNotes/2.5.2.txt[2.5.2],
  89  link:RelNotes/2.5.1.txt[2.5.1],
  90  link:RelNotes/2.5.0.txt[2.5].
  91
  92* link:v2.4.11/git.html[documentation for release 2.4.11]
  93
  94* release notes for
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  96  link:RelNotes/2.4.10.txt[2.4.10],
  97  link:RelNotes/2.4.9.txt[2.4.9],
  98  link:RelNotes/2.4.8.txt[2.4.8],
  99  link:RelNotes/2.4.7.txt[2.4.7],
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 109
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 129  link:RelNotes/2.2.0.txt[2.2].
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 131* link:v2.1.4/git.html[documentation for release 2.1.4]
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 160* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
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 429  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 430  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 431  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 432  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 433  link:RelNotes/1.5.6.txt[1.5.6].
 434
 435* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 436
 437* release notes for
 438  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 439  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 440  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 441  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 442  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 443  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 444  link:RelNotes/1.5.5.txt[1.5.5].
 445
 446* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 447
 448* release notes for
 449  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 450  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 451  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 452  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 453  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 454  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 455  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 456  link:RelNotes/1.5.4.txt[1.5.4].
 457
 458* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 459
 460* release notes for
 461  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 462  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 463  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 464  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 465  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 466  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 467  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 468  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 469  link:RelNotes/1.5.3.txt[1.5.3].
 470
 471* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 472
 473* release notes for
 474  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 475  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 476  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 477  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 478  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 479  link:RelNotes/1.5.2.txt[1.5.2].
 480
 481* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 482
 483* release notes for
 484  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 485  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 486  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 487  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 488  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 489  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 490  link:RelNotes/1.5.1.txt[1.5.1].
 491
 492* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 493
 494* release notes for
 495  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 496  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 497  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 498  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 499  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 500  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 501  link:RelNotes/1.5.0.txt[1.5.0].
 502
 503* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 504  link:v1.3.3/git.html[1.3.3],
 505  link:v1.2.6/git.html[1.2.6],
 506  link:v1.0.13/git.html[1.0.13].
 507
 508============
 509
 510endif::stalenotes[]
 511
 512OPTIONS
 513-------
 514--version::
 515        Prints the Git suite version that the 'git' program came from.
 516
 517--help::
 518        Prints the synopsis and a list of the most commonly used
 519        commands. If the option `--all` or `-a` is given then all
 520        available commands are printed. If a Git command is named this
 521        option will bring up the manual page for that command.
 522+
 523Other options are available to control how the manual page is
 524displayed. See linkgit:git-help[1] for more information,
 525because `git --help ...` is converted internally into `git
 526help ...`.
 527
 528-C <path>::
 529        Run as if git was started in '<path>' instead of the current working
 530        directory.  When multiple `-C` options are given, each subsequent
 531        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 532        <path>`.
 533+
 534This option affects options that expect path name like `--git-dir` and
 535`--work-tree` in that their interpretations of the path names would be
 536made relative to the working directory caused by the `-C` option. For
 537example the following invocations are equivalent:
 538
 539    git --git-dir=a.git --work-tree=b -C c status
 540    git --git-dir=c/a.git --work-tree=c/b status
 541
 542-c <name>=<value>::
 543        Pass a configuration parameter to the command. The value
 544        given will override values from configuration files.
 545        The <name> is expected in the same format as listed by
 546        'git config' (subkeys separated by dots).
 547+
 548Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 549`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 550config file). Including the equals but with an empty value (like `git -c
 551foo.bar= ...`) sets `foo.bar` to the empty string.
 552
 553--exec-path[=<path>]::
 554        Path to wherever your core Git programs are installed.
 555        This can also be controlled by setting the GIT_EXEC_PATH
 556        environment variable. If no path is given, 'git' will print
 557        the current setting and then exit.
 558
 559--html-path::
 560        Print the path, without trailing slash, where Git's HTML
 561        documentation is installed and exit.
 562
 563--man-path::
 564        Print the manpath (see `man(1)`) for the man pages for
 565        this version of Git and exit.
 566
 567--info-path::
 568        Print the path where the Info files documenting this
 569        version of Git are installed and exit.
 570
 571-p::
 572--paginate::
 573        Pipe all output into 'less' (or if set, $PAGER) if standard
 574        output is a terminal.  This overrides the `pager.<cmd>`
 575        configuration options (see the "Configuration Mechanism" section
 576        below).
 577
 578--no-pager::
 579        Do not pipe Git output into a pager.
 580
 581--git-dir=<path>::
 582        Set the path to the repository. This can also be controlled by
 583        setting the `GIT_DIR` environment variable. It can be an absolute
 584        path or relative path to current working directory.
 585
 586--work-tree=<path>::
 587        Set the path to the working tree. It can be an absolute path
 588        or a path relative to the current working directory.
 589        This can also be controlled by setting the GIT_WORK_TREE
 590        environment variable and the core.worktree configuration
 591        variable (see core.worktree in linkgit:git-config[1] for a
 592        more detailed discussion).
 593
 594--namespace=<path>::
 595        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 596        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 597        variable.
 598
 599--bare::
 600        Treat the repository as a bare repository.  If GIT_DIR
 601        environment is not set, it is set to the current working
 602        directory.
 603
 604--no-replace-objects::
 605        Do not use replacement refs to replace Git objects. See
 606        linkgit:git-replace[1] for more information.
 607
 608--literal-pathspecs::
 609        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 610        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 611        variable to `1`.
 612
 613--glob-pathspecs::
 614        Add "glob" magic to all pathspec. This is equivalent to setting
 615        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 616        globbing on individual pathspecs can be done using pathspec
 617        magic ":(literal)"
 618
 619--noglob-pathspecs::
 620        Add "literal" magic to all pathspec. This is equivalent to setting
 621        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 622        globbing on individual pathspecs can be done using pathspec
 623        magic ":(glob)"
 624
 625--icase-pathspecs::
 626        Add "icase" magic to all pathspec. This is equivalent to setting
 627        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 628
 629GIT COMMANDS
 630------------
 631
 632We divide Git into high level ("porcelain") commands and low level
 633("plumbing") commands.
 634
 635High-level commands (porcelain)
 636-------------------------------
 637
 638We separate the porcelain commands into the main commands and some
 639ancillary user utilities.
 640
 641Main porcelain commands
 642~~~~~~~~~~~~~~~~~~~~~~~
 643
 644include::cmds-mainporcelain.txt[]
 645
 646Ancillary Commands
 647~~~~~~~~~~~~~~~~~~
 648Manipulators:
 649
 650include::cmds-ancillarymanipulators.txt[]
 651
 652Interrogators:
 653
 654include::cmds-ancillaryinterrogators.txt[]
 655
 656
 657Interacting with Others
 658~~~~~~~~~~~~~~~~~~~~~~~
 659
 660These commands are to interact with foreign SCM and with other
 661people via patch over e-mail.
 662
 663include::cmds-foreignscminterface.txt[]
 664
 665
 666Low-level commands (plumbing)
 667-----------------------------
 668
 669Although Git includes its
 670own porcelain layer, its low-level commands are sufficient to support
 671development of alternative porcelains.  Developers of such porcelains
 672might start by reading about linkgit:git-update-index[1] and
 673linkgit:git-read-tree[1].
 674
 675The interface (input, output, set of options and the semantics)
 676to these low-level commands are meant to be a lot more stable
 677than Porcelain level commands, because these commands are
 678primarily for scripted use.  The interface to Porcelain commands
 679on the other hand are subject to change in order to improve the
 680end user experience.
 681
 682The following description divides
 683the low-level commands into commands that manipulate objects (in
 684the repository, index, and working tree), commands that interrogate and
 685compare objects, and commands that move objects and references between
 686repositories.
 687
 688
 689Manipulation commands
 690~~~~~~~~~~~~~~~~~~~~~
 691
 692include::cmds-plumbingmanipulators.txt[]
 693
 694
 695Interrogation commands
 696~~~~~~~~~~~~~~~~~~~~~~
 697
 698include::cmds-plumbinginterrogators.txt[]
 699
 700In general, the interrogate commands do not touch the files in
 701the working tree.
 702
 703
 704Synching repositories
 705~~~~~~~~~~~~~~~~~~~~~
 706
 707include::cmds-synchingrepositories.txt[]
 708
 709The following are helper commands used by the above; end users
 710typically do not use them directly.
 711
 712include::cmds-synchelpers.txt[]
 713
 714
 715Internal helper commands
 716~~~~~~~~~~~~~~~~~~~~~~~~
 717
 718These are internal helper commands used by other commands; end
 719users typically do not use them directly.
 720
 721include::cmds-purehelpers.txt[]
 722
 723
 724Configuration Mechanism
 725-----------------------
 726
 727Git uses a simple text format to store customizations that are per
 728repository and are per user.  Such a configuration file may look
 729like this:
 730
 731------------
 732#
 733# A '#' or ';' character indicates a comment.
 734#
 735
 736; core variables
 737[core]
 738        ; Don't trust file modes
 739        filemode = false
 740
 741; user identity
 742[user]
 743        name = "Junio C Hamano"
 744        email = "gitster@pobox.com"
 745
 746------------
 747
 748Various commands read from the configuration file and adjust
 749their operation accordingly.  See linkgit:git-config[1] for a
 750list and more details about the configuration mechanism.
 751
 752
 753Identifier Terminology
 754----------------------
 755<object>::
 756        Indicates the object name for any type of object.
 757
 758<blob>::
 759        Indicates a blob object name.
 760
 761<tree>::
 762        Indicates a tree object name.
 763
 764<commit>::
 765        Indicates a commit object name.
 766
 767<tree-ish>::
 768        Indicates a tree, commit or tag object name.  A
 769        command that takes a <tree-ish> argument ultimately wants to
 770        operate on a <tree> object but automatically dereferences
 771        <commit> and <tag> objects that point at a <tree>.
 772
 773<commit-ish>::
 774        Indicates a commit or tag object name.  A
 775        command that takes a <commit-ish> argument ultimately wants to
 776        operate on a <commit> object but automatically dereferences
 777        <tag> objects that point at a <commit>.
 778
 779<type>::
 780        Indicates that an object type is required.
 781        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 782
 783<file>::
 784        Indicates a filename - almost always relative to the
 785        root of the tree structure `GIT_INDEX_FILE` describes.
 786
 787Symbolic Identifiers
 788--------------------
 789Any Git command accepting any <object> can also use the following
 790symbolic notation:
 791
 792HEAD::
 793        indicates the head of the current branch.
 794
 795<tag>::
 796        a valid tag 'name'
 797        (i.e. a `refs/tags/<tag>` reference).
 798
 799<head>::
 800        a valid head 'name'
 801        (i.e. a `refs/heads/<head>` reference).
 802
 803For a more complete list of ways to spell object names, see
 804"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 805
 806
 807File/Directory Structure
 808------------------------
 809
 810Please see the linkgit:gitrepository-layout[5] document.
 811
 812Read linkgit:githooks[5] for more details about each hook.
 813
 814Higher level SCMs may provide and manage additional information in the
 815`$GIT_DIR`.
 816
 817
 818Terminology
 819-----------
 820Please see linkgit:gitglossary[7].
 821
 822
 823Environment Variables
 824---------------------
 825Various Git commands use the following environment variables:
 826
 827The Git Repository
 828~~~~~~~~~~~~~~~~~~
 829These environment variables apply to 'all' core Git commands. Nb: it
 830is worth noting that they may be used/overridden by SCMS sitting above
 831Git so take care if using a foreign front-end.
 832
 833`GIT_INDEX_FILE`::
 834        This environment allows the specification of an alternate
 835        index file. If not specified, the default of `$GIT_DIR/index`
 836        is used.
 837
 838`GIT_INDEX_VERSION`::
 839        This environment variable allows the specification of an index
 840        version for new repositories.  It won't affect existing index
 841        files.  By default index file version 2 or 3 is used. See
 842        linkgit:git-update-index[1] for more information.
 843
 844`GIT_OBJECT_DIRECTORY`::
 845        If the object storage directory is specified via this
 846        environment variable then the sha1 directories are created
 847        underneath - otherwise the default `$GIT_DIR/objects`
 848        directory is used.
 849
 850`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 851        Due to the immutable nature of Git objects, old objects can be
 852        archived into shared, read-only directories. This variable
 853        specifies a ":" separated (on Windows ";" separated) list
 854        of Git object directories which can be used to search for Git
 855        objects. New objects will not be written to these directories.
 856
 857`GIT_DIR`::
 858        If the `GIT_DIR` environment variable is set then it
 859        specifies a path to use instead of the default `.git`
 860        for the base of the repository.
 861        The `--git-dir` command-line option also sets this value.
 862
 863`GIT_WORK_TREE`::
 864        Set the path to the root of the working tree.
 865        This can also be controlled by the `--work-tree` command-line
 866        option and the core.worktree configuration variable.
 867
 868`GIT_NAMESPACE`::
 869        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 870        The `--namespace` command-line option also sets this value.
 871
 872`GIT_CEILING_DIRECTORIES`::
 873        This should be a colon-separated list of absolute paths.  If
 874        set, it is a list of directories that Git should not chdir up
 875        into while looking for a repository directory (useful for
 876        excluding slow-loading network directories).  It will not
 877        exclude the current working directory or a GIT_DIR set on the
 878        command line or in the environment.  Normally, Git has to read
 879        the entries in this list and resolve any symlink that
 880        might be present in order to compare them with the current
 881        directory.  However, if even this access is slow, you
 882        can add an empty entry to the list to tell Git that the
 883        subsequent entries are not symlinks and needn't be resolved;
 884        e.g.,
 885        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 886
 887`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 888        When run in a directory that does not have ".git" repository
 889        directory, Git tries to find such a directory in the parent
 890        directories to find the top of the working tree, but by default it
 891        does not cross filesystem boundaries.  This environment variable
 892        can be set to true to tell Git not to stop at filesystem
 893        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 894        an explicit repository directory set via `GIT_DIR` or on the
 895        command line.
 896
 897`GIT_COMMON_DIR`::
 898        If this variable is set to a path, non-worktree files that are
 899        normally in $GIT_DIR will be taken from this path
 900        instead. Worktree-specific files such as HEAD or index are
 901        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 902        linkgit:git-worktree[1] for
 903        details. This variable has lower precedence than other path
 904        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 905
 906Git Commits
 907~~~~~~~~~~~
 908`GIT_AUTHOR_NAME`::
 909`GIT_AUTHOR_EMAIL`::
 910`GIT_AUTHOR_DATE`::
 911`GIT_COMMITTER_NAME`::
 912`GIT_COMMITTER_EMAIL`::
 913`GIT_COMMITTER_DATE`::
 914'EMAIL'::
 915        see linkgit:git-commit-tree[1]
 916
 917Git Diffs
 918~~~~~~~~~
 919`GIT_DIFF_OPTS`::
 920        Only valid setting is "--unified=??" or "-u??" to set the
 921        number of context lines shown when a unified diff is created.
 922        This takes precedence over any "-U" or "--unified" option
 923        value passed on the Git diff command line.
 924
 925`GIT_EXTERNAL_DIFF`::
 926        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 927        program named by it is called, instead of the diff invocation
 928        described above.  For a path that is added, removed, or modified,
 929        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 930
 931        path old-file old-hex old-mode new-file new-hex new-mode
 932+
 933where:
 934
 935        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 936                         contents of <old|new>,
 937        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 938        <old|new>-mode:: are the octal representation of the file modes.
 939+
 940The file parameters can point at the user's working file
 941(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 942when a new file is added), or a temporary file (e.g. `old-file` in the
 943index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 944temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 945+
 946For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 947parameter, <path>.
 948+
 949For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 950`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 951
 952`GIT_DIFF_PATH_COUNTER`::
 953        A 1-based counter incremented by one for every path.
 954
 955`GIT_DIFF_PATH_TOTAL`::
 956        The total number of paths.
 957
 958other
 959~~~~~
 960`GIT_MERGE_VERBOSITY`::
 961        A number controlling the amount of output shown by
 962        the recursive merge strategy.  Overrides merge.verbosity.
 963        See linkgit:git-merge[1]
 964
 965`GIT_PAGER`::
 966        This environment variable overrides `$PAGER`. If it is set
 967        to an empty string or to the value "cat", Git will not launch
 968        a pager.  See also the `core.pager` option in
 969        linkgit:git-config[1].
 970
 971`GIT_EDITOR`::
 972        This environment variable overrides `$EDITOR` and `$VISUAL`.
 973        It is used by several Git commands when, on interactive mode,
 974        an editor is to be launched. See also linkgit:git-var[1]
 975        and the `core.editor` option in linkgit:git-config[1].
 976
 977`GIT_SSH`::
 978`GIT_SSH_COMMAND`::
 979        If either of these environment variables is set then 'git fetch'
 980        and 'git push' will use the specified command instead of 'ssh'
 981        when they need to connect to a remote system.
 982        The command will be given exactly two or four arguments: the
 983        'username@host' (or just 'host') from the URL and the shell
 984        command to execute on that remote system, optionally preceded by
 985        `-p` (literally) and the 'port' from the URL when it specifies
 986        something other than the default SSH port.
 987+
 988`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 989by the shell, which allows additional arguments to be included.
 990`$GIT_SSH` on the other hand must be just the path to a program
 991(which can be a wrapper shell script, if additional arguments are
 992needed).
 993+
 994Usually it is easier to configure any desired options through your
 995personal `.ssh/config` file.  Please consult your ssh documentation
 996for further details.
 997
 998`GIT_ASKPASS`::
 999        If this environment variable is set, then Git commands which need to
1000        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1001        will call this program with a suitable prompt as command-line argument
1002        and read the password from its STDOUT. See also the `core.askPass`
1003        option in linkgit:git-config[1].
1004
1005`GIT_TERMINAL_PROMPT`::
1006        If this environment variable is set to `0`, git will not prompt
1007        on the terminal (e.g., when asking for HTTP authentication).
1008
1009`GIT_CONFIG_NOSYSTEM`::
1010        Whether to skip reading settings from the system-wide
1011        `$(prefix)/etc/gitconfig` file.  This environment variable can
1012        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1013        predictable environment for a picky script, or you can set it
1014        temporarily to avoid using a buggy `/etc/gitconfig` file while
1015        waiting for someone with sufficient permissions to fix it.
1016
1017`GIT_FLUSH`::
1018        If this environment variable is set to "1", then commands such
1019        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1020        'git check-attr' and 'git check-ignore' will
1021        force a flush of the output stream after each record have been
1022        flushed. If this
1023        variable is set to "0", the output of these commands will be done
1024        using completely buffered I/O.   If this environment variable is
1025        not set, Git will choose buffered or record-oriented flushing
1026        based on whether stdout appears to be redirected to a file or not.
1027
1028`GIT_TRACE`::
1029        Enables general trace messages, e.g. alias expansion, built-in
1030        command execution and external command execution.
1031+
1032If this variable is set to "1", "2" or "true" (comparison
1033is case insensitive), trace messages will be printed to
1034stderr.
1035+
1036If the variable is set to an integer value greater than 2
1037and lower than 10 (strictly) then Git will interpret this
1038value as an open file descriptor and will try to write the
1039trace messages into this file descriptor.
1040+
1041Alternatively, if the variable is set to an absolute path
1042(starting with a '/' character), Git will interpret this
1043as a file path and will try to write the trace messages
1044into it.
1045+
1046Unsetting the variable, or setting it to empty, "0" or
1047"false" (case insensitive) disables trace messages.
1048
1049`GIT_TRACE_PACK_ACCESS`::
1050        Enables trace messages for all accesses to any packs. For each
1051        access, the pack file name and an offset in the pack is
1052        recorded. This may be helpful for troubleshooting some
1053        pack-related performance problems.
1054        See `GIT_TRACE` for available trace output options.
1055
1056`GIT_TRACE_PACKET`::
1057        Enables trace messages for all packets coming in or out of a
1058        given program. This can help with debugging object negotiation
1059        or other protocol issues. Tracing is turned off at a packet
1060        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1061        See `GIT_TRACE` for available trace output options.
1062
1063`GIT_TRACE_PACKFILE`::
1064        Enables tracing of packfiles sent or received by a
1065        given program. Unlike other trace output, this trace is
1066        verbatim: no headers, and no quoting of binary data. You almost
1067        certainly want to direct into a file (e.g.,
1068        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1069        the terminal or mixing it with other trace output.
1070+
1071Note that this is currently only implemented for the client side
1072of clones and fetches.
1073
1074`GIT_TRACE_PERFORMANCE`::
1075        Enables performance related trace messages, e.g. total execution
1076        time of each Git command.
1077        See `GIT_TRACE` for available trace output options.
1078
1079`GIT_TRACE_SETUP`::
1080        Enables trace messages printing the .git, working tree and current
1081        working directory after Git has completed its setup phase.
1082        See `GIT_TRACE` for available trace output options.
1083
1084`GIT_TRACE_SHALLOW`::
1085        Enables trace messages that can help debugging fetching /
1086        cloning of shallow repositories.
1087        See `GIT_TRACE` for available trace output options.
1088
1089`GIT_LITERAL_PATHSPECS`::
1090        Setting this variable to `1` will cause Git to treat all
1091        pathspecs literally, rather than as glob patterns. For example,
1092        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1093        for commits that touch the path `*.c`, not any paths that the
1094        glob `*.c` matches. You might want this if you are feeding
1095        literal paths to Git (e.g., paths previously given to you by
1096        `git ls-tree`, `--raw` diff output, etc).
1097
1098`GIT_GLOB_PATHSPECS`::
1099        Setting this variable to `1` will cause Git to treat all
1100        pathspecs as glob patterns (aka "glob" magic).
1101
1102`GIT_NOGLOB_PATHSPECS`::
1103        Setting this variable to `1` will cause Git to treat all
1104        pathspecs as literal (aka "literal" magic).
1105
1106`GIT_ICASE_PATHSPECS`::
1107        Setting this variable to `1` will cause Git to treat all
1108        pathspecs as case-insensitive.
1109
1110`GIT_REFLOG_ACTION`::
1111        When a ref is updated, reflog entries are created to keep
1112        track of the reason why the ref was updated (which is
1113        typically the name of the high-level command that updated
1114        the ref), in addition to the old and new values of the ref.
1115        A scripted Porcelain command can use set_reflog_action
1116        helper function in `git-sh-setup` to set its name to this
1117        variable when it is invoked as the top level command by the
1118        end user, to be recorded in the body of the reflog.
1119
1120`GIT_REF_PARANOIA`::
1121        If set to `1`, include broken or badly named refs when iterating
1122        over lists of refs. In a normal, non-corrupted repository, this
1123        does nothing. However, enabling it may help git to detect and
1124        abort some operations in the presence of broken refs. Git sets
1125        this variable automatically when performing destructive
1126        operations like linkgit:git-prune[1]. You should not need to set
1127        it yourself unless you want to be paranoid about making sure
1128        an operation has touched every ref (e.g., because you are
1129        cloning a repository to make a backup).
1130
1131`GIT_ALLOW_PROTOCOL`::
1132        If set, provide a colon-separated list of protocols which are
1133        allowed to be used with fetch/push/clone. This is useful to
1134        restrict recursive submodule initialization from an untrusted
1135        repository. Any protocol not mentioned will be disallowed (i.e.,
1136        this is a whitelist, not a blacklist). If the variable is not
1137        set at all, all protocols are enabled.  The protocol names
1138        currently used by git are:
1139
1140          - `file`: any local file-based path (including `file://` URLs,
1141            or local paths)
1142
1143          - `git`: the anonymous git protocol over a direct TCP
1144            connection (or proxy, if configured)
1145
1146          - `ssh`: git over ssh (including `host:path` syntax,
1147            `ssh://`, etc).
1148
1149          - `http`: git over http, both "smart http" and "dumb http".
1150            Note that this does _not_ include `https`; if you want both,
1151            you should specify both as `http:https`.
1152
1153          - any external helpers are named by their protocol (e.g., use
1154            `hg` to allow the `git-remote-hg` helper)
1155
1156
1157Discussion[[Discussion]]
1158------------------------
1159
1160More detail on the following is available from the
1161link:user-manual.html#git-concepts[Git concepts chapter of the
1162user-manual] and linkgit:gitcore-tutorial[7].
1163
1164A Git project normally consists of a working directory with a ".git"
1165subdirectory at the top level.  The .git directory contains, among other
1166things, a compressed object database representing the complete history
1167of the project, an "index" file which links that history to the current
1168contents of the working tree, and named pointers into that history such
1169as tags and branch heads.
1170
1171The object database contains objects of three main types: blobs, which
1172hold file data; trees, which point to blobs and other trees to build up
1173directory hierarchies; and commits, which each reference a single tree
1174and some number of parent commits.
1175
1176The commit, equivalent to what other systems call a "changeset" or
1177"version", represents a step in the project's history, and each parent
1178represents an immediately preceding step.  Commits with more than one
1179parent represent merges of independent lines of development.
1180
1181All objects are named by the SHA-1 hash of their contents, normally
1182written as a string of 40 hex digits.  Such names are globally unique.
1183The entire history leading up to a commit can be vouched for by signing
1184just that commit.  A fourth object type, the tag, is provided for this
1185purpose.
1186
1187When first created, objects are stored in individual files, but for
1188efficiency may later be compressed together into "pack files".
1189
1190Named pointers called refs mark interesting points in history.  A ref
1191may contain the SHA-1 name of an object or the name of another ref.  Refs
1192with names beginning `ref/head/` contain the SHA-1 name of the most
1193recent commit (or "head") of a branch under development.  SHA-1 names of
1194tags of interest are stored under `ref/tags/`.  A special ref named
1195`HEAD` contains the name of the currently checked-out branch.
1196
1197The index file is initialized with a list of all paths and, for each
1198path, a blob object and a set of attributes.  The blob object represents
1199the contents of the file as of the head of the current branch.  The
1200attributes (last modified time, size, etc.) are taken from the
1201corresponding file in the working tree.  Subsequent changes to the
1202working tree can be found by comparing these attributes.  The index may
1203be updated with new content, and new commits may be created from the
1204content stored in the index.
1205
1206The index is also capable of storing multiple entries (called "stages")
1207for a given pathname.  These stages are used to hold the various
1208unmerged version of a file when a merge is in progress.
1209
1210FURTHER DOCUMENTATION
1211---------------------
1212
1213See the references in the "description" section to get started
1214using Git.  The following is probably more detail than necessary
1215for a first-time user.
1216
1217The link:user-manual.html#git-concepts[Git concepts chapter of the
1218user-manual] and linkgit:gitcore-tutorial[7] both provide
1219introductions to the underlying Git architecture.
1220
1221See linkgit:gitworkflows[7] for an overview of recommended workflows.
1222
1223See also the link:howto-index.html[howto] documents for some useful
1224examples.
1225
1226The internals are documented in the
1227link:technical/api-index.html[Git API documentation].
1228
1229Users migrating from CVS may also want to
1230read linkgit:gitcvs-migration[7].
1231
1232
1233Authors
1234-------
1235Git was started by Linus Torvalds, and is currently maintained by Junio
1236C Hamano. Numerous contributions have come from the Git mailing list
1237<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1238gives you a more complete list of contributors.
1239
1240If you have a clone of git.git itself, the
1241output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1242the authors for specific parts of the project.
1243
1244Reporting Bugs
1245--------------
1246
1247Report bugs to the Git mailing list <git@vger.kernel.org> where the
1248development and maintenance is primarily done.  You do not have to be
1249subscribed to the list to send a message there.
1250
1251SEE ALSO
1252--------
1253linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1254linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1255linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1256linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1257linkgit:gitworkflows[7]
1258
1259GIT
1260---
1261Part of the linkgit:git[1] suite