Documentation / git.txton commit mingw: adjust is_console() to work with stdin (fee807c)
   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:v2.10.2/git.html[documentation for release 2.10.2]
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 433* release notes for
 434  link:RelNotes/1.5.6.6.txt[1.5.6.6],
 435  link:RelNotes/1.5.6.5.txt[1.5.6.5],
 436  link:RelNotes/1.5.6.4.txt[1.5.6.4],
 437  link:RelNotes/1.5.6.3.txt[1.5.6.3],
 438  link:RelNotes/1.5.6.2.txt[1.5.6.2],
 439  link:RelNotes/1.5.6.1.txt[1.5.6.1],
 440  link:RelNotes/1.5.6.txt[1.5.6].
 441
 442* link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
 443
 444* release notes for
 445  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 446  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 447  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 448  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 449  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 450  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 451  link:RelNotes/1.5.5.txt[1.5.5].
 452
 453* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 454
 455* release notes for
 456  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 457  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 458  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 459  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 460  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 461  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 462  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 463  link:RelNotes/1.5.4.txt[1.5.4].
 464
 465* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 466
 467* release notes for
 468  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 469  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 470  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 471  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 472  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 473  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 474  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 475  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 476  link:RelNotes/1.5.3.txt[1.5.3].
 477
 478* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 479
 480* release notes for
 481  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 482  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 483  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 484  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 485  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 486  link:RelNotes/1.5.2.txt[1.5.2].
 487
 488* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 489
 490* release notes for
 491  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 492  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 493  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 494  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 495  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 496  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 497  link:RelNotes/1.5.1.txt[1.5.1].
 498
 499* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 500
 501* release notes for
 502  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 503  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 504  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 505  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 506  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 507  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 508  link:RelNotes/1.5.0.txt[1.5.0].
 509
 510* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 511  link:v1.3.3/git.html[1.3.3],
 512  link:v1.2.6/git.html[1.2.6],
 513  link:v1.0.13/git.html[1.0.13].
 514
 515============
 516
 517endif::stalenotes[]
 518
 519OPTIONS
 520-------
 521--version::
 522        Prints the Git suite version that the 'git' program came from.
 523
 524--help::
 525        Prints the synopsis and a list of the most commonly used
 526        commands. If the option `--all` or `-a` is given then all
 527        available commands are printed. If a Git command is named this
 528        option will bring up the manual page for that command.
 529+
 530Other options are available to control how the manual page is
 531displayed. See linkgit:git-help[1] for more information,
 532because `git --help ...` is converted internally into `git
 533help ...`.
 534
 535-C <path>::
 536        Run as if git was started in '<path>' instead of the current working
 537        directory.  When multiple `-C` options are given, each subsequent
 538        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 539        <path>`.
 540+
 541This option affects options that expect path name like `--git-dir` and
 542`--work-tree` in that their interpretations of the path names would be
 543made relative to the working directory caused by the `-C` option. For
 544example the following invocations are equivalent:
 545
 546    git --git-dir=a.git --work-tree=b -C c status
 547    git --git-dir=c/a.git --work-tree=c/b status
 548
 549-c <name>=<value>::
 550        Pass a configuration parameter to the command. The value
 551        given will override values from configuration files.
 552        The <name> is expected in the same format as listed by
 553        'git config' (subkeys separated by dots).
 554+
 555Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 556`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 557config file). Including the equals but with an empty value (like `git -c
 558foo.bar= ...`) sets `foo.bar` to the empty string.
 559
 560--exec-path[=<path>]::
 561        Path to wherever your core Git programs are installed.
 562        This can also be controlled by setting the GIT_EXEC_PATH
 563        environment variable. If no path is given, 'git' will print
 564        the current setting and then exit.
 565
 566--html-path::
 567        Print the path, without trailing slash, where Git's HTML
 568        documentation is installed and exit.
 569
 570--man-path::
 571        Print the manpath (see `man(1)`) for the man pages for
 572        this version of Git and exit.
 573
 574--info-path::
 575        Print the path where the Info files documenting this
 576        version of Git are installed and exit.
 577
 578-p::
 579--paginate::
 580        Pipe all output into 'less' (or if set, $PAGER) if standard
 581        output is a terminal.  This overrides the `pager.<cmd>`
 582        configuration options (see the "Configuration Mechanism" section
 583        below).
 584
 585--no-pager::
 586        Do not pipe Git output into a pager.
 587
 588--git-dir=<path>::
 589        Set the path to the repository. This can also be controlled by
 590        setting the `GIT_DIR` environment variable. It can be an absolute
 591        path or relative path to current working directory.
 592
 593--work-tree=<path>::
 594        Set the path to the working tree. It can be an absolute path
 595        or a path relative to the current working directory.
 596        This can also be controlled by setting the GIT_WORK_TREE
 597        environment variable and the core.worktree configuration
 598        variable (see core.worktree in linkgit:git-config[1] for a
 599        more detailed discussion).
 600
 601--namespace=<path>::
 602        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 603        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 604        variable.
 605
 606--bare::
 607        Treat the repository as a bare repository.  If GIT_DIR
 608        environment is not set, it is set to the current working
 609        directory.
 610
 611--no-replace-objects::
 612        Do not use replacement refs to replace Git objects. See
 613        linkgit:git-replace[1] for more information.
 614
 615--literal-pathspecs::
 616        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 617        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 618        variable to `1`.
 619
 620--glob-pathspecs::
 621        Add "glob" magic to all pathspec. This is equivalent to setting
 622        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 623        globbing on individual pathspecs can be done using pathspec
 624        magic ":(literal)"
 625
 626--noglob-pathspecs::
 627        Add "literal" magic to all pathspec. This is equivalent to setting
 628        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 629        globbing on individual pathspecs can be done using pathspec
 630        magic ":(glob)"
 631
 632--icase-pathspecs::
 633        Add "icase" magic to all pathspec. This is equivalent to setting
 634        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 635
 636GIT COMMANDS
 637------------
 638
 639We divide Git into high level ("porcelain") commands and low level
 640("plumbing") commands.
 641
 642High-level commands (porcelain)
 643-------------------------------
 644
 645We separate the porcelain commands into the main commands and some
 646ancillary user utilities.
 647
 648Main porcelain commands
 649~~~~~~~~~~~~~~~~~~~~~~~
 650
 651include::cmds-mainporcelain.txt[]
 652
 653Ancillary Commands
 654~~~~~~~~~~~~~~~~~~
 655Manipulators:
 656
 657include::cmds-ancillarymanipulators.txt[]
 658
 659Interrogators:
 660
 661include::cmds-ancillaryinterrogators.txt[]
 662
 663
 664Interacting with Others
 665~~~~~~~~~~~~~~~~~~~~~~~
 666
 667These commands are to interact with foreign SCM and with other
 668people via patch over e-mail.
 669
 670include::cmds-foreignscminterface.txt[]
 671
 672
 673Low-level commands (plumbing)
 674-----------------------------
 675
 676Although Git includes its
 677own porcelain layer, its low-level commands are sufficient to support
 678development of alternative porcelains.  Developers of such porcelains
 679might start by reading about linkgit:git-update-index[1] and
 680linkgit:git-read-tree[1].
 681
 682The interface (input, output, set of options and the semantics)
 683to these low-level commands are meant to be a lot more stable
 684than Porcelain level commands, because these commands are
 685primarily for scripted use.  The interface to Porcelain commands
 686on the other hand are subject to change in order to improve the
 687end user experience.
 688
 689The following description divides
 690the low-level commands into commands that manipulate objects (in
 691the repository, index, and working tree), commands that interrogate and
 692compare objects, and commands that move objects and references between
 693repositories.
 694
 695
 696Manipulation commands
 697~~~~~~~~~~~~~~~~~~~~~
 698
 699include::cmds-plumbingmanipulators.txt[]
 700
 701
 702Interrogation commands
 703~~~~~~~~~~~~~~~~~~~~~~
 704
 705include::cmds-plumbinginterrogators.txt[]
 706
 707In general, the interrogate commands do not touch the files in
 708the working tree.
 709
 710
 711Synching repositories
 712~~~~~~~~~~~~~~~~~~~~~
 713
 714include::cmds-synchingrepositories.txt[]
 715
 716The following are helper commands used by the above; end users
 717typically do not use them directly.
 718
 719include::cmds-synchelpers.txt[]
 720
 721
 722Internal helper commands
 723~~~~~~~~~~~~~~~~~~~~~~~~
 724
 725These are internal helper commands used by other commands; end
 726users typically do not use them directly.
 727
 728include::cmds-purehelpers.txt[]
 729
 730
 731Configuration Mechanism
 732-----------------------
 733
 734Git uses a simple text format to store customizations that are per
 735repository and are per user.  Such a configuration file may look
 736like this:
 737
 738------------
 739#
 740# A '#' or ';' character indicates a comment.
 741#
 742
 743; core variables
 744[core]
 745        ; Don't trust file modes
 746        filemode = false
 747
 748; user identity
 749[user]
 750        name = "Junio C Hamano"
 751        email = "gitster@pobox.com"
 752
 753------------
 754
 755Various commands read from the configuration file and adjust
 756their operation accordingly.  See linkgit:git-config[1] for a
 757list and more details about the configuration mechanism.
 758
 759
 760Identifier Terminology
 761----------------------
 762<object>::
 763        Indicates the object name for any type of object.
 764
 765<blob>::
 766        Indicates a blob object name.
 767
 768<tree>::
 769        Indicates a tree object name.
 770
 771<commit>::
 772        Indicates a commit object name.
 773
 774<tree-ish>::
 775        Indicates a tree, commit or tag object name.  A
 776        command that takes a <tree-ish> argument ultimately wants to
 777        operate on a <tree> object but automatically dereferences
 778        <commit> and <tag> objects that point at a <tree>.
 779
 780<commit-ish>::
 781        Indicates a commit or tag object name.  A
 782        command that takes a <commit-ish> argument ultimately wants to
 783        operate on a <commit> object but automatically dereferences
 784        <tag> objects that point at a <commit>.
 785
 786<type>::
 787        Indicates that an object type is required.
 788        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 789
 790<file>::
 791        Indicates a filename - almost always relative to the
 792        root of the tree structure `GIT_INDEX_FILE` describes.
 793
 794Symbolic Identifiers
 795--------------------
 796Any Git command accepting any <object> can also use the following
 797symbolic notation:
 798
 799HEAD::
 800        indicates the head of the current branch.
 801
 802<tag>::
 803        a valid tag 'name'
 804        (i.e. a `refs/tags/<tag>` reference).
 805
 806<head>::
 807        a valid head 'name'
 808        (i.e. a `refs/heads/<head>` reference).
 809
 810For a more complete list of ways to spell object names, see
 811"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 812
 813
 814File/Directory Structure
 815------------------------
 816
 817Please see the linkgit:gitrepository-layout[5] document.
 818
 819Read linkgit:githooks[5] for more details about each hook.
 820
 821Higher level SCMs may provide and manage additional information in the
 822`$GIT_DIR`.
 823
 824
 825Terminology
 826-----------
 827Please see linkgit:gitglossary[7].
 828
 829
 830Environment Variables
 831---------------------
 832Various Git commands use the following environment variables:
 833
 834The Git Repository
 835~~~~~~~~~~~~~~~~~~
 836These environment variables apply to 'all' core Git commands. Nb: it
 837is worth noting that they may be used/overridden by SCMS sitting above
 838Git so take care if using a foreign front-end.
 839
 840`GIT_INDEX_FILE`::
 841        This environment allows the specification of an alternate
 842        index file. If not specified, the default of `$GIT_DIR/index`
 843        is used.
 844
 845`GIT_INDEX_VERSION`::
 846        This environment variable allows the specification of an index
 847        version for new repositories.  It won't affect existing index
 848        files.  By default index file version 2 or 3 is used. See
 849        linkgit:git-update-index[1] for more information.
 850
 851`GIT_OBJECT_DIRECTORY`::
 852        If the object storage directory is specified via this
 853        environment variable then the sha1 directories are created
 854        underneath - otherwise the default `$GIT_DIR/objects`
 855        directory is used.
 856
 857`GIT_ALTERNATE_OBJECT_DIRECTORIES`::
 858        Due to the immutable nature of Git objects, old objects can be
 859        archived into shared, read-only directories. This variable
 860        specifies a ":" separated (on Windows ";" separated) list
 861        of Git object directories which can be used to search for Git
 862        objects. New objects will not be written to these directories.
 863
 864`GIT_DIR`::
 865        If the `GIT_DIR` environment variable is set then it
 866        specifies a path to use instead of the default `.git`
 867        for the base of the repository.
 868        The `--git-dir` command-line option also sets this value.
 869
 870`GIT_WORK_TREE`::
 871        Set the path to the root of the working tree.
 872        This can also be controlled by the `--work-tree` command-line
 873        option and the core.worktree configuration variable.
 874
 875`GIT_NAMESPACE`::
 876        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 877        The `--namespace` command-line option also sets this value.
 878
 879`GIT_CEILING_DIRECTORIES`::
 880        This should be a colon-separated list of absolute paths.  If
 881        set, it is a list of directories that Git should not chdir up
 882        into while looking for a repository directory (useful for
 883        excluding slow-loading network directories).  It will not
 884        exclude the current working directory or a GIT_DIR set on the
 885        command line or in the environment.  Normally, Git has to read
 886        the entries in this list and resolve any symlink that
 887        might be present in order to compare them with the current
 888        directory.  However, if even this access is slow, you
 889        can add an empty entry to the list to tell Git that the
 890        subsequent entries are not symlinks and needn't be resolved;
 891        e.g.,
 892        `GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink`.
 893
 894`GIT_DISCOVERY_ACROSS_FILESYSTEM`::
 895        When run in a directory that does not have ".git" repository
 896        directory, Git tries to find such a directory in the parent
 897        directories to find the top of the working tree, but by default it
 898        does not cross filesystem boundaries.  This environment variable
 899        can be set to true to tell Git not to stop at filesystem
 900        boundaries.  Like `GIT_CEILING_DIRECTORIES`, this will not affect
 901        an explicit repository directory set via `GIT_DIR` or on the
 902        command line.
 903
 904`GIT_COMMON_DIR`::
 905        If this variable is set to a path, non-worktree files that are
 906        normally in $GIT_DIR will be taken from this path
 907        instead. Worktree-specific files such as HEAD or index are
 908        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 909        linkgit:git-worktree[1] for
 910        details. This variable has lower precedence than other path
 911        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 912
 913Git Commits
 914~~~~~~~~~~~
 915`GIT_AUTHOR_NAME`::
 916`GIT_AUTHOR_EMAIL`::
 917`GIT_AUTHOR_DATE`::
 918`GIT_COMMITTER_NAME`::
 919`GIT_COMMITTER_EMAIL`::
 920`GIT_COMMITTER_DATE`::
 921'EMAIL'::
 922        see linkgit:git-commit-tree[1]
 923
 924Git Diffs
 925~~~~~~~~~
 926`GIT_DIFF_OPTS`::
 927        Only valid setting is "--unified=??" or "-u??" to set the
 928        number of context lines shown when a unified diff is created.
 929        This takes precedence over any "-U" or "--unified" option
 930        value passed on the Git diff command line.
 931
 932`GIT_EXTERNAL_DIFF`::
 933        When the environment variable `GIT_EXTERNAL_DIFF` is set, the
 934        program named by it is called, instead of the diff invocation
 935        described above.  For a path that is added, removed, or modified,
 936        `GIT_EXTERNAL_DIFF` is called with 7 parameters:
 937
 938        path old-file old-hex old-mode new-file new-hex new-mode
 939+
 940where:
 941
 942        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 943                         contents of <old|new>,
 944        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 945        <old|new>-mode:: are the octal representation of the file modes.
 946+
 947The file parameters can point at the user's working file
 948(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 949when a new file is added), or a temporary file (e.g. `old-file` in the
 950index).  `GIT_EXTERNAL_DIFF` should not worry about unlinking the
 951temporary file --- it is removed when `GIT_EXTERNAL_DIFF` exits.
 952+
 953For a path that is unmerged, `GIT_EXTERNAL_DIFF` is called with 1
 954parameter, <path>.
 955+
 956For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
 957`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
 958
 959`GIT_DIFF_PATH_COUNTER`::
 960        A 1-based counter incremented by one for every path.
 961
 962`GIT_DIFF_PATH_TOTAL`::
 963        The total number of paths.
 964
 965other
 966~~~~~
 967`GIT_MERGE_VERBOSITY`::
 968        A number controlling the amount of output shown by
 969        the recursive merge strategy.  Overrides merge.verbosity.
 970        See linkgit:git-merge[1]
 971
 972`GIT_PAGER`::
 973        This environment variable overrides `$PAGER`. If it is set
 974        to an empty string or to the value "cat", Git will not launch
 975        a pager.  See also the `core.pager` option in
 976        linkgit:git-config[1].
 977
 978`GIT_EDITOR`::
 979        This environment variable overrides `$EDITOR` and `$VISUAL`.
 980        It is used by several Git commands when, on interactive mode,
 981        an editor is to be launched. See also linkgit:git-var[1]
 982        and the `core.editor` option in linkgit:git-config[1].
 983
 984`GIT_SSH`::
 985`GIT_SSH_COMMAND`::
 986        If either of these environment variables is set then 'git fetch'
 987        and 'git push' will use the specified command instead of 'ssh'
 988        when they need to connect to a remote system.
 989        The command will be given exactly two or four arguments: the
 990        'username@host' (or just 'host') from the URL and the shell
 991        command to execute on that remote system, optionally preceded by
 992        `-p` (literally) and the 'port' from the URL when it specifies
 993        something other than the default SSH port.
 994+
 995`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 996by the shell, which allows additional arguments to be included.
 997`$GIT_SSH` on the other hand must be just the path to a program
 998(which can be a wrapper shell script, if additional arguments are
 999needed).
1000+
1001Usually it is easier to configure any desired options through your
1002personal `.ssh/config` file.  Please consult your ssh documentation
1003for further details.
1004
1005`GIT_ASKPASS`::
1006        If this environment variable is set, then Git commands which need to
1007        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
1008        will call this program with a suitable prompt as command-line argument
1009        and read the password from its STDOUT. See also the `core.askPass`
1010        option in linkgit:git-config[1].
1011
1012`GIT_TERMINAL_PROMPT`::
1013        If this environment variable is set to `0`, git will not prompt
1014        on the terminal (e.g., when asking for HTTP authentication).
1015
1016`GIT_CONFIG_NOSYSTEM`::
1017        Whether to skip reading settings from the system-wide
1018        `$(prefix)/etc/gitconfig` file.  This environment variable can
1019        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1020        predictable environment for a picky script, or you can set it
1021        temporarily to avoid using a buggy `/etc/gitconfig` file while
1022        waiting for someone with sufficient permissions to fix it.
1023
1024`GIT_FLUSH`::
1025        If this environment variable is set to "1", then commands such
1026        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1027        'git check-attr' and 'git check-ignore' will
1028        force a flush of the output stream after each record have been
1029        flushed. If this
1030        variable is set to "0", the output of these commands will be done
1031        using completely buffered I/O.   If this environment variable is
1032        not set, Git will choose buffered or record-oriented flushing
1033        based on whether stdout appears to be redirected to a file or not.
1034
1035`GIT_TRACE`::
1036        Enables general trace messages, e.g. alias expansion, built-in
1037        command execution and external command execution.
1038+
1039If this variable is set to "1", "2" or "true" (comparison
1040is case insensitive), trace messages will be printed to
1041stderr.
1042+
1043If the variable is set to an integer value greater than 2
1044and lower than 10 (strictly) then Git will interpret this
1045value as an open file descriptor and will try to write the
1046trace messages into this file descriptor.
1047+
1048Alternatively, if the variable is set to an absolute path
1049(starting with a '/' character), Git will interpret this
1050as a file path and will try to write the trace messages
1051into it.
1052+
1053Unsetting the variable, or setting it to empty, "0" or
1054"false" (case insensitive) disables trace messages.
1055
1056`GIT_TRACE_PACK_ACCESS`::
1057        Enables trace messages for all accesses to any packs. For each
1058        access, the pack file name and an offset in the pack is
1059        recorded. This may be helpful for troubleshooting some
1060        pack-related performance problems.
1061        See `GIT_TRACE` for available trace output options.
1062
1063`GIT_TRACE_PACKET`::
1064        Enables trace messages for all packets coming in or out of a
1065        given program. This can help with debugging object negotiation
1066        or other protocol issues. Tracing is turned off at a packet
1067        starting with "PACK" (but see `GIT_TRACE_PACKFILE` below).
1068        See `GIT_TRACE` for available trace output options.
1069
1070`GIT_TRACE_PACKFILE`::
1071        Enables tracing of packfiles sent or received by a
1072        given program. Unlike other trace output, this trace is
1073        verbatim: no headers, and no quoting of binary data. You almost
1074        certainly want to direct into a file (e.g.,
1075        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1076        the terminal or mixing it with other trace output.
1077+
1078Note that this is currently only implemented for the client side
1079of clones and fetches.
1080
1081`GIT_TRACE_PERFORMANCE`::
1082        Enables performance related trace messages, e.g. total execution
1083        time of each Git command.
1084        See `GIT_TRACE` for available trace output options.
1085
1086`GIT_TRACE_SETUP`::
1087        Enables trace messages printing the .git, working tree and current
1088        working directory after Git has completed its setup phase.
1089        See `GIT_TRACE` for available trace output options.
1090
1091`GIT_TRACE_SHALLOW`::
1092        Enables trace messages that can help debugging fetching /
1093        cloning of shallow repositories.
1094        See `GIT_TRACE` for available trace output options.
1095
1096`GIT_TRACE_CURL`::
1097        Enables a curl full trace dump of all incoming and outgoing data,
1098        including descriptive information, of the git transport protocol.
1099        This is similar to doing curl `--trace-ascii` on the command line.
1100        This option overrides setting the `GIT_CURL_VERBOSE` environment
1101        variable.
1102        See `GIT_TRACE` for available trace output options.
1103
1104`GIT_LITERAL_PATHSPECS`::
1105        Setting this variable to `1` will cause Git to treat all
1106        pathspecs literally, rather than as glob patterns. For example,
1107        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1108        for commits that touch the path `*.c`, not any paths that the
1109        glob `*.c` matches. You might want this if you are feeding
1110        literal paths to Git (e.g., paths previously given to you by
1111        `git ls-tree`, `--raw` diff output, etc).
1112
1113`GIT_GLOB_PATHSPECS`::
1114        Setting this variable to `1` will cause Git to treat all
1115        pathspecs as glob patterns (aka "glob" magic).
1116
1117`GIT_NOGLOB_PATHSPECS`::
1118        Setting this variable to `1` will cause Git to treat all
1119        pathspecs as literal (aka "literal" magic).
1120
1121`GIT_ICASE_PATHSPECS`::
1122        Setting this variable to `1` will cause Git to treat all
1123        pathspecs as case-insensitive.
1124
1125`GIT_REFLOG_ACTION`::
1126        When a ref is updated, reflog entries are created to keep
1127        track of the reason why the ref was updated (which is
1128        typically the name of the high-level command that updated
1129        the ref), in addition to the old and new values of the ref.
1130        A scripted Porcelain command can use set_reflog_action
1131        helper function in `git-sh-setup` to set its name to this
1132        variable when it is invoked as the top level command by the
1133        end user, to be recorded in the body of the reflog.
1134
1135`GIT_REF_PARANOIA`::
1136        If set to `1`, include broken or badly named refs when iterating
1137        over lists of refs. In a normal, non-corrupted repository, this
1138        does nothing. However, enabling it may help git to detect and
1139        abort some operations in the presence of broken refs. Git sets
1140        this variable automatically when performing destructive
1141        operations like linkgit:git-prune[1]. You should not need to set
1142        it yourself unless you want to be paranoid about making sure
1143        an operation has touched every ref (e.g., because you are
1144        cloning a repository to make a backup).
1145
1146`GIT_ALLOW_PROTOCOL`::
1147        If set, provide a colon-separated list of protocols which are
1148        allowed to be used with fetch/push/clone. This is useful to
1149        restrict recursive submodule initialization from an untrusted
1150        repository. Any protocol not mentioned will be disallowed (i.e.,
1151        this is a whitelist, not a blacklist). If the variable is not
1152        set at all, all protocols are enabled.  The protocol names
1153        currently used by git are:
1154
1155          - `file`: any local file-based path (including `file://` URLs,
1156            or local paths)
1157
1158          - `git`: the anonymous git protocol over a direct TCP
1159            connection (or proxy, if configured)
1160
1161          - `ssh`: git over ssh (including `host:path` syntax,
1162            `ssh://`, etc).
1163
1164          - `http`: git over http, both "smart http" and "dumb http".
1165            Note that this does _not_ include `https`; if you want both,
1166            you should specify both as `http:https`.
1167
1168          - any external helpers are named by their protocol (e.g., use
1169            `hg` to allow the `git-remote-hg` helper)
1170
1171
1172Discussion[[Discussion]]
1173------------------------
1174
1175More detail on the following is available from the
1176link:user-manual.html#git-concepts[Git concepts chapter of the
1177user-manual] and linkgit:gitcore-tutorial[7].
1178
1179A Git project normally consists of a working directory with a ".git"
1180subdirectory at the top level.  The .git directory contains, among other
1181things, a compressed object database representing the complete history
1182of the project, an "index" file which links that history to the current
1183contents of the working tree, and named pointers into that history such
1184as tags and branch heads.
1185
1186The object database contains objects of three main types: blobs, which
1187hold file data; trees, which point to blobs and other trees to build up
1188directory hierarchies; and commits, which each reference a single tree
1189and some number of parent commits.
1190
1191The commit, equivalent to what other systems call a "changeset" or
1192"version", represents a step in the project's history, and each parent
1193represents an immediately preceding step.  Commits with more than one
1194parent represent merges of independent lines of development.
1195
1196All objects are named by the SHA-1 hash of their contents, normally
1197written as a string of 40 hex digits.  Such names are globally unique.
1198The entire history leading up to a commit can be vouched for by signing
1199just that commit.  A fourth object type, the tag, is provided for this
1200purpose.
1201
1202When first created, objects are stored in individual files, but for
1203efficiency may later be compressed together into "pack files".
1204
1205Named pointers called refs mark interesting points in history.  A ref
1206may contain the SHA-1 name of an object or the name of another ref.  Refs
1207with names beginning `ref/head/` contain the SHA-1 name of the most
1208recent commit (or "head") of a branch under development.  SHA-1 names of
1209tags of interest are stored under `ref/tags/`.  A special ref named
1210`HEAD` contains the name of the currently checked-out branch.
1211
1212The index file is initialized with a list of all paths and, for each
1213path, a blob object and a set of attributes.  The blob object represents
1214the contents of the file as of the head of the current branch.  The
1215attributes (last modified time, size, etc.) are taken from the
1216corresponding file in the working tree.  Subsequent changes to the
1217working tree can be found by comparing these attributes.  The index may
1218be updated with new content, and new commits may be created from the
1219content stored in the index.
1220
1221The index is also capable of storing multiple entries (called "stages")
1222for a given pathname.  These stages are used to hold the various
1223unmerged version of a file when a merge is in progress.
1224
1225FURTHER DOCUMENTATION
1226---------------------
1227
1228See the references in the "description" section to get started
1229using Git.  The following is probably more detail than necessary
1230for a first-time user.
1231
1232The link:user-manual.html#git-concepts[Git concepts chapter of the
1233user-manual] and linkgit:gitcore-tutorial[7] both provide
1234introductions to the underlying Git architecture.
1235
1236See linkgit:gitworkflows[7] for an overview of recommended workflows.
1237
1238See also the link:howto-index.html[howto] documents for some useful
1239examples.
1240
1241The internals are documented in the
1242link:technical/api-index.html[Git API documentation].
1243
1244Users migrating from CVS may also want to
1245read linkgit:gitcvs-migration[7].
1246
1247
1248Authors
1249-------
1250Git was started by Linus Torvalds, and is currently maintained by Junio
1251C Hamano. Numerous contributions have come from the Git mailing list
1252<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1253gives you a more complete list of contributors.
1254
1255If you have a clone of git.git itself, the
1256output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1257the authors for specific parts of the project.
1258
1259Reporting Bugs
1260--------------
1261
1262Report bugs to the Git mailing list <git@vger.kernel.org> where the
1263development and maintenance is primarily done.  You do not have to be
1264subscribed to the list to send a message there.
1265
1266SEE ALSO
1267--------
1268linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1269linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1270linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1271linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1272linkgit:gitworkflows[7]
1273
1274GIT
1275---
1276Part of the linkgit:git[1] suite