Documentation / git.txton commit http: treat config options sslCAPath and sslCAInfo as paths (bf9acba)
   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:v2.6.3/git.html[documentation for release 2.6.3]
  47
  48* release notes for
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  51  link:RelNotes/2.6.1.txt[2.6.1],
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  53
  54* link:v2.5.4/git.html[documentation for release 2.5.4]
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  56* release notes for
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  58  link:RelNotes/2.5.3.txt[2.5.3],
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  60  link:RelNotes/2.5.1.txt[2.5.1],
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  62
  63* link:v2.4.10/git.html[documentation for release 2.4.10]
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 424  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 425  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 426  link:RelNotes/1.5.4.txt[1.5.4].
 427
 428* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 429
 430* release notes for
 431  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 432  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 433  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 434  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 435  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 436  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 437  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 438  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 439  link:RelNotes/1.5.3.txt[1.5.3].
 440
 441* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 442
 443* release notes for
 444  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 445  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 446  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 447  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 448  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 449  link:RelNotes/1.5.2.txt[1.5.2].
 450
 451* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 452
 453* release notes for
 454  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 455  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 456  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 457  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 458  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 459  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 460  link:RelNotes/1.5.1.txt[1.5.1].
 461
 462* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 463
 464* release notes for
 465  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 466  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 467  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 468  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 469  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 470  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 471  link:RelNotes/1.5.0.txt[1.5.0].
 472
 473* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 474  link:v1.3.3/git.html[1.3.3],
 475  link:v1.2.6/git.html[1.2.6],
 476  link:v1.0.13/git.html[1.0.13].
 477
 478============
 479
 480endif::stalenotes[]
 481
 482OPTIONS
 483-------
 484--version::
 485        Prints the Git suite version that the 'git' program came from.
 486
 487--help::
 488        Prints the synopsis and a list of the most commonly used
 489        commands. If the option '--all' or '-a' is given then all
 490        available commands are printed. If a Git command is named this
 491        option will bring up the manual page for that command.
 492+
 493Other options are available to control how the manual page is
 494displayed. See linkgit:git-help[1] for more information,
 495because `git --help ...` is converted internally into `git
 496help ...`.
 497
 498-C <path>::
 499        Run as if git was started in '<path>' instead of the current working
 500        directory.  When multiple `-C` options are given, each subsequent
 501        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 502        <path>`.
 503+
 504This option affects options that expect path name like `--git-dir` and
 505`--work-tree` in that their interpretations of the path names would be
 506made relative to the working directory caused by the `-C` option. For
 507example the following invocations are equivalent:
 508
 509    git --git-dir=a.git --work-tree=b -C c status
 510    git --git-dir=c/a.git --work-tree=c/b status
 511
 512-c <name>=<value>::
 513        Pass a configuration parameter to the command. The value
 514        given will override values from configuration files.
 515        The <name> is expected in the same format as listed by
 516        'git config' (subkeys separated by dots).
 517+
 518Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 519`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 520config file). Including the equals but with an empty value (like `git -c
 521foo.bar= ...`) sets `foo.bar` to the empty string.
 522
 523--exec-path[=<path>]::
 524        Path to wherever your core Git programs are installed.
 525        This can also be controlled by setting the GIT_EXEC_PATH
 526        environment variable. If no path is given, 'git' will print
 527        the current setting and then exit.
 528
 529--html-path::
 530        Print the path, without trailing slash, where Git's HTML
 531        documentation is installed and exit.
 532
 533--man-path::
 534        Print the manpath (see `man(1)`) for the man pages for
 535        this version of Git and exit.
 536
 537--info-path::
 538        Print the path where the Info files documenting this
 539        version of Git are installed and exit.
 540
 541-p::
 542--paginate::
 543        Pipe all output into 'less' (or if set, $PAGER) if standard
 544        output is a terminal.  This overrides the `pager.<cmd>`
 545        configuration options (see the "Configuration Mechanism" section
 546        below).
 547
 548--no-pager::
 549        Do not pipe Git output into a pager.
 550
 551--git-dir=<path>::
 552        Set the path to the repository. This can also be controlled by
 553        setting the GIT_DIR environment variable. It can be an absolute
 554        path or relative path to current working directory.
 555
 556--work-tree=<path>::
 557        Set the path to the working tree. It can be an absolute path
 558        or a path relative to the current working directory.
 559        This can also be controlled by setting the GIT_WORK_TREE
 560        environment variable and the core.worktree configuration
 561        variable (see core.worktree in linkgit:git-config[1] for a
 562        more detailed discussion).
 563
 564--namespace=<path>::
 565        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 566        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 567        variable.
 568
 569--bare::
 570        Treat the repository as a bare repository.  If GIT_DIR
 571        environment is not set, it is set to the current working
 572        directory.
 573
 574--no-replace-objects::
 575        Do not use replacement refs to replace Git objects. See
 576        linkgit:git-replace[1] for more information.
 577
 578--literal-pathspecs::
 579        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 580        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 581        variable to `1`.
 582
 583--glob-pathspecs::
 584        Add "glob" magic to all pathspec. This is equivalent to setting
 585        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 586        globbing on individual pathspecs can be done using pathspec
 587        magic ":(literal)"
 588
 589--noglob-pathspecs::
 590        Add "literal" magic to all pathspec. This is equivalent to setting
 591        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 592        globbing on individual pathspecs can be done using pathspec
 593        magic ":(glob)"
 594
 595--icase-pathspecs::
 596        Add "icase" magic to all pathspec. This is equivalent to setting
 597        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 598
 599GIT COMMANDS
 600------------
 601
 602We divide Git into high level ("porcelain") commands and low level
 603("plumbing") commands.
 604
 605High-level commands (porcelain)
 606-------------------------------
 607
 608We separate the porcelain commands into the main commands and some
 609ancillary user utilities.
 610
 611Main porcelain commands
 612~~~~~~~~~~~~~~~~~~~~~~~
 613
 614include::cmds-mainporcelain.txt[]
 615
 616Ancillary Commands
 617~~~~~~~~~~~~~~~~~~
 618Manipulators:
 619
 620include::cmds-ancillarymanipulators.txt[]
 621
 622Interrogators:
 623
 624include::cmds-ancillaryinterrogators.txt[]
 625
 626
 627Interacting with Others
 628~~~~~~~~~~~~~~~~~~~~~~~
 629
 630These commands are to interact with foreign SCM and with other
 631people via patch over e-mail.
 632
 633include::cmds-foreignscminterface.txt[]
 634
 635
 636Low-level commands (plumbing)
 637-----------------------------
 638
 639Although Git includes its
 640own porcelain layer, its low-level commands are sufficient to support
 641development of alternative porcelains.  Developers of such porcelains
 642might start by reading about linkgit:git-update-index[1] and
 643linkgit:git-read-tree[1].
 644
 645The interface (input, output, set of options and the semantics)
 646to these low-level commands are meant to be a lot more stable
 647than Porcelain level commands, because these commands are
 648primarily for scripted use.  The interface to Porcelain commands
 649on the other hand are subject to change in order to improve the
 650end user experience.
 651
 652The following description divides
 653the low-level commands into commands that manipulate objects (in
 654the repository, index, and working tree), commands that interrogate and
 655compare objects, and commands that move objects and references between
 656repositories.
 657
 658
 659Manipulation commands
 660~~~~~~~~~~~~~~~~~~~~~
 661
 662include::cmds-plumbingmanipulators.txt[]
 663
 664
 665Interrogation commands
 666~~~~~~~~~~~~~~~~~~~~~~
 667
 668include::cmds-plumbinginterrogators.txt[]
 669
 670In general, the interrogate commands do not touch the files in
 671the working tree.
 672
 673
 674Synching repositories
 675~~~~~~~~~~~~~~~~~~~~~
 676
 677include::cmds-synchingrepositories.txt[]
 678
 679The following are helper commands used by the above; end users
 680typically do not use them directly.
 681
 682include::cmds-synchelpers.txt[]
 683
 684
 685Internal helper commands
 686~~~~~~~~~~~~~~~~~~~~~~~~
 687
 688These are internal helper commands used by other commands; end
 689users typically do not use them directly.
 690
 691include::cmds-purehelpers.txt[]
 692
 693
 694Configuration Mechanism
 695-----------------------
 696
 697Git uses a simple text format to store customizations that are per
 698repository and are per user.  Such a configuration file may look
 699like this:
 700
 701------------
 702#
 703# A '#' or ';' character indicates a comment.
 704#
 705
 706; core variables
 707[core]
 708        ; Don't trust file modes
 709        filemode = false
 710
 711; user identity
 712[user]
 713        name = "Junio C Hamano"
 714        email = "gitster@pobox.com"
 715
 716------------
 717
 718Various commands read from the configuration file and adjust
 719their operation accordingly.  See linkgit:git-config[1] for a
 720list and more details about the configuration mechanism.
 721
 722
 723Identifier Terminology
 724----------------------
 725<object>::
 726        Indicates the object name for any type of object.
 727
 728<blob>::
 729        Indicates a blob object name.
 730
 731<tree>::
 732        Indicates a tree object name.
 733
 734<commit>::
 735        Indicates a commit object name.
 736
 737<tree-ish>::
 738        Indicates a tree, commit or tag object name.  A
 739        command that takes a <tree-ish> argument ultimately wants to
 740        operate on a <tree> object but automatically dereferences
 741        <commit> and <tag> objects that point at a <tree>.
 742
 743<commit-ish>::
 744        Indicates a commit or tag object name.  A
 745        command that takes a <commit-ish> argument ultimately wants to
 746        operate on a <commit> object but automatically dereferences
 747        <tag> objects that point at a <commit>.
 748
 749<type>::
 750        Indicates that an object type is required.
 751        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 752
 753<file>::
 754        Indicates a filename - almost always relative to the
 755        root of the tree structure `GIT_INDEX_FILE` describes.
 756
 757Symbolic Identifiers
 758--------------------
 759Any Git command accepting any <object> can also use the following
 760symbolic notation:
 761
 762HEAD::
 763        indicates the head of the current branch.
 764
 765<tag>::
 766        a valid tag 'name'
 767        (i.e. a `refs/tags/<tag>` reference).
 768
 769<head>::
 770        a valid head 'name'
 771        (i.e. a `refs/heads/<head>` reference).
 772
 773For a more complete list of ways to spell object names, see
 774"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 775
 776
 777File/Directory Structure
 778------------------------
 779
 780Please see the linkgit:gitrepository-layout[5] document.
 781
 782Read linkgit:githooks[5] for more details about each hook.
 783
 784Higher level SCMs may provide and manage additional information in the
 785`$GIT_DIR`.
 786
 787
 788Terminology
 789-----------
 790Please see linkgit:gitglossary[7].
 791
 792
 793Environment Variables
 794---------------------
 795Various Git commands use the following environment variables:
 796
 797The Git Repository
 798~~~~~~~~~~~~~~~~~~
 799These environment variables apply to 'all' core Git commands. Nb: it
 800is worth noting that they may be used/overridden by SCMS sitting above
 801Git so take care if using a foreign front-end.
 802
 803'GIT_INDEX_FILE'::
 804        This environment allows the specification of an alternate
 805        index file. If not specified, the default of `$GIT_DIR/index`
 806        is used.
 807
 808'GIT_INDEX_VERSION'::
 809        This environment variable allows the specification of an index
 810        version for new repositories.  It won't affect existing index
 811        files.  By default index file version 2 or 3 is used. See
 812        linkgit:git-update-index[1] for more information.
 813
 814'GIT_OBJECT_DIRECTORY'::
 815        If the object storage directory is specified via this
 816        environment variable then the sha1 directories are created
 817        underneath - otherwise the default `$GIT_DIR/objects`
 818        directory is used.
 819
 820'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 821        Due to the immutable nature of Git objects, old objects can be
 822        archived into shared, read-only directories. This variable
 823        specifies a ":" separated (on Windows ";" separated) list
 824        of Git object directories which can be used to search for Git
 825        objects. New objects will not be written to these directories.
 826
 827'GIT_DIR'::
 828        If the 'GIT_DIR' environment variable is set then it
 829        specifies a path to use instead of the default `.git`
 830        for the base of the repository.
 831        The '--git-dir' command-line option also sets this value.
 832
 833'GIT_WORK_TREE'::
 834        Set the path to the root of the working tree.
 835        This can also be controlled by the '--work-tree' command-line
 836        option and the core.worktree configuration variable.
 837
 838'GIT_NAMESPACE'::
 839        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 840        The '--namespace' command-line option also sets this value.
 841
 842'GIT_CEILING_DIRECTORIES'::
 843        This should be a colon-separated list of absolute paths.  If
 844        set, it is a list of directories that Git should not chdir up
 845        into while looking for a repository directory (useful for
 846        excluding slow-loading network directories).  It will not
 847        exclude the current working directory or a GIT_DIR set on the
 848        command line or in the environment.  Normally, Git has to read
 849        the entries in this list and resolve any symlink that
 850        might be present in order to compare them with the current
 851        directory.  However, if even this access is slow, you
 852        can add an empty entry to the list to tell Git that the
 853        subsequent entries are not symlinks and needn't be resolved;
 854        e.g.,
 855        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 856
 857'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 858        When run in a directory that does not have ".git" repository
 859        directory, Git tries to find such a directory in the parent
 860        directories to find the top of the working tree, but by default it
 861        does not cross filesystem boundaries.  This environment variable
 862        can be set to true to tell Git not to stop at filesystem
 863        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 864        an explicit repository directory set via 'GIT_DIR' or on the
 865        command line.
 866
 867'GIT_COMMON_DIR'::
 868        If this variable is set to a path, non-worktree files that are
 869        normally in $GIT_DIR will be taken from this path
 870        instead. Worktree-specific files such as HEAD or index are
 871        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 872        linkgit:git-worktree[1] for
 873        details. This variable has lower precedence than other path
 874        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 875
 876Git Commits
 877~~~~~~~~~~~
 878'GIT_AUTHOR_NAME'::
 879'GIT_AUTHOR_EMAIL'::
 880'GIT_AUTHOR_DATE'::
 881'GIT_COMMITTER_NAME'::
 882'GIT_COMMITTER_EMAIL'::
 883'GIT_COMMITTER_DATE'::
 884'EMAIL'::
 885        see linkgit:git-commit-tree[1]
 886
 887Git Diffs
 888~~~~~~~~~
 889'GIT_DIFF_OPTS'::
 890        Only valid setting is "--unified=??" or "-u??" to set the
 891        number of context lines shown when a unified diff is created.
 892        This takes precedence over any "-U" or "--unified" option
 893        value passed on the Git diff command line.
 894
 895'GIT_EXTERNAL_DIFF'::
 896        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 897        program named by it is called, instead of the diff invocation
 898        described above.  For a path that is added, removed, or modified,
 899        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 900
 901        path old-file old-hex old-mode new-file new-hex new-mode
 902+
 903where:
 904
 905        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 906                         contents of <old|new>,
 907        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 908        <old|new>-mode:: are the octal representation of the file modes.
 909+
 910The file parameters can point at the user's working file
 911(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 912when a new file is added), or a temporary file (e.g. `old-file` in the
 913index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 914temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 915+
 916For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 917parameter, <path>.
 918+
 919For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 920'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 921
 922'GIT_DIFF_PATH_COUNTER'::
 923        A 1-based counter incremented by one for every path.
 924
 925'GIT_DIFF_PATH_TOTAL'::
 926        The total number of paths.
 927
 928other
 929~~~~~
 930'GIT_MERGE_VERBOSITY'::
 931        A number controlling the amount of output shown by
 932        the recursive merge strategy.  Overrides merge.verbosity.
 933        See linkgit:git-merge[1]
 934
 935'GIT_PAGER'::
 936        This environment variable overrides `$PAGER`. If it is set
 937        to an empty string or to the value "cat", Git will not launch
 938        a pager.  See also the `core.pager` option in
 939        linkgit:git-config[1].
 940
 941'GIT_EDITOR'::
 942        This environment variable overrides `$EDITOR` and `$VISUAL`.
 943        It is used by several Git commands when, on interactive mode,
 944        an editor is to be launched. See also linkgit:git-var[1]
 945        and the `core.editor` option in linkgit:git-config[1].
 946
 947'GIT_SSH'::
 948'GIT_SSH_COMMAND'::
 949        If either of these environment variables is set then 'git fetch'
 950        and 'git push' will use the specified command instead of 'ssh'
 951        when they need to connect to a remote system.
 952        The command will be given exactly two or four arguments: the
 953        'username@host' (or just 'host') from the URL and the shell
 954        command to execute on that remote system, optionally preceded by
 955        '-p' (literally) and the 'port' from the URL when it specifies
 956        something other than the default SSH port.
 957+
 958`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 959by the shell, which allows additional arguments to be included.
 960`$GIT_SSH` on the other hand must be just the path to a program
 961(which can be a wrapper shell script, if additional arguments are
 962needed).
 963+
 964Usually it is easier to configure any desired options through your
 965personal `.ssh/config` file.  Please consult your ssh documentation
 966for further details.
 967
 968'GIT_ASKPASS'::
 969        If this environment variable is set, then Git commands which need to
 970        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 971        will call this program with a suitable prompt as command-line argument
 972        and read the password from its STDOUT. See also the 'core.askPass'
 973        option in linkgit:git-config[1].
 974
 975'GIT_TERMINAL_PROMPT'::
 976        If this environment variable is set to `0`, git will not prompt
 977        on the terminal (e.g., when asking for HTTP authentication).
 978
 979'GIT_CONFIG_NOSYSTEM'::
 980        Whether to skip reading settings from the system-wide
 981        `$(prefix)/etc/gitconfig` file.  This environment variable can
 982        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 983        predictable environment for a picky script, or you can set it
 984        temporarily to avoid using a buggy `/etc/gitconfig` file while
 985        waiting for someone with sufficient permissions to fix it.
 986
 987'GIT_FLUSH'::
 988        If this environment variable is set to "1", then commands such
 989        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 990        'git check-attr' and 'git check-ignore' will
 991        force a flush of the output stream after each record have been
 992        flushed. If this
 993        variable is set to "0", the output of these commands will be done
 994        using completely buffered I/O.   If this environment variable is
 995        not set, Git will choose buffered or record-oriented flushing
 996        based on whether stdout appears to be redirected to a file or not.
 997
 998'GIT_TRACE'::
 999        Enables general trace messages, e.g. alias expansion, built-in
1000        command execution and external command execution.
1001+
1002If this variable is set to "1", "2" or "true" (comparison
1003is case insensitive), trace messages will be printed to
1004stderr.
1005+
1006If the variable is set to an integer value greater than 2
1007and lower than 10 (strictly) then Git will interpret this
1008value as an open file descriptor and will try to write the
1009trace messages into this file descriptor.
1010+
1011Alternatively, if the variable is set to an absolute path
1012(starting with a '/' character), Git will interpret this
1013as a file path and will try to write the trace messages
1014into it.
1015+
1016Unsetting the variable, or setting it to empty, "0" or
1017"false" (case insensitive) disables trace messages.
1018
1019'GIT_TRACE_PACK_ACCESS'::
1020        Enables trace messages for all accesses to any packs. For each
1021        access, the pack file name and an offset in the pack is
1022        recorded. This may be helpful for troubleshooting some
1023        pack-related performance problems.
1024        See 'GIT_TRACE' for available trace output options.
1025
1026'GIT_TRACE_PACKET'::
1027        Enables trace messages for all packets coming in or out of a
1028        given program. This can help with debugging object negotiation
1029        or other protocol issues. Tracing is turned off at a packet
1030        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1031        See 'GIT_TRACE' for available trace output options.
1032
1033'GIT_TRACE_PACKFILE'::
1034        Enables tracing of packfiles sent or received by a
1035        given program. Unlike other trace output, this trace is
1036        verbatim: no headers, and no quoting of binary data. You almost
1037        certainly want to direct into a file (e.g.,
1038        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1039        the terminal or mixing it with other trace output.
1040+
1041Note that this is currently only implemented for the client side
1042of clones and fetches.
1043
1044'GIT_TRACE_PERFORMANCE'::
1045        Enables performance related trace messages, e.g. total execution
1046        time of each Git command.
1047        See 'GIT_TRACE' for available trace output options.
1048
1049'GIT_TRACE_SETUP'::
1050        Enables trace messages printing the .git, working tree and current
1051        working directory after Git has completed its setup phase.
1052        See 'GIT_TRACE' for available trace output options.
1053
1054'GIT_TRACE_SHALLOW'::
1055        Enables trace messages that can help debugging fetching /
1056        cloning of shallow repositories.
1057        See 'GIT_TRACE' for available trace output options.
1058
1059GIT_LITERAL_PATHSPECS::
1060        Setting this variable to `1` will cause Git to treat all
1061        pathspecs literally, rather than as glob patterns. For example,
1062        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1063        for commits that touch the path `*.c`, not any paths that the
1064        glob `*.c` matches. You might want this if you are feeding
1065        literal paths to Git (e.g., paths previously given to you by
1066        `git ls-tree`, `--raw` diff output, etc).
1067
1068GIT_GLOB_PATHSPECS::
1069        Setting this variable to `1` will cause Git to treat all
1070        pathspecs as glob patterns (aka "glob" magic).
1071
1072GIT_NOGLOB_PATHSPECS::
1073        Setting this variable to `1` will cause Git to treat all
1074        pathspecs as literal (aka "literal" magic).
1075
1076GIT_ICASE_PATHSPECS::
1077        Setting this variable to `1` will cause Git to treat all
1078        pathspecs as case-insensitive.
1079
1080'GIT_REFLOG_ACTION'::
1081        When a ref is updated, reflog entries are created to keep
1082        track of the reason why the ref was updated (which is
1083        typically the name of the high-level command that updated
1084        the ref), in addition to the old and new values of the ref.
1085        A scripted Porcelain command can use set_reflog_action
1086        helper function in `git-sh-setup` to set its name to this
1087        variable when it is invoked as the top level command by the
1088        end user, to be recorded in the body of the reflog.
1089
1090`GIT_REF_PARANOIA`::
1091        If set to `1`, include broken or badly named refs when iterating
1092        over lists of refs. In a normal, non-corrupted repository, this
1093        does nothing. However, enabling it may help git to detect and
1094        abort some operations in the presence of broken refs. Git sets
1095        this variable automatically when performing destructive
1096        operations like linkgit:git-prune[1]. You should not need to set
1097        it yourself unless you want to be paranoid about making sure
1098        an operation has touched every ref (e.g., because you are
1099        cloning a repository to make a backup).
1100
1101`GIT_ALLOW_PROTOCOL`::
1102        If set, provide a colon-separated list of protocols which are
1103        allowed to be used with fetch/push/clone. This is useful to
1104        restrict recursive submodule initialization from an untrusted
1105        repository. Any protocol not mentioned will be disallowed (i.e.,
1106        this is a whitelist, not a blacklist). If the variable is not
1107        set at all, all protocols are enabled.  The protocol names
1108        currently used by git are:
1109
1110          - `file`: any local file-based path (including `file://` URLs,
1111            or local paths)
1112
1113          - `git`: the anonymous git protocol over a direct TCP
1114            connection (or proxy, if configured)
1115
1116          - `ssh`: git over ssh (including `host:path` syntax,
1117            `git+ssh://`, etc).
1118
1119          - `rsync`: git over rsync
1120
1121          - `http`: git over http, both "smart http" and "dumb http".
1122            Note that this does _not_ include `https`; if you want both,
1123            you should specify both as `http:https`.
1124
1125          - any external helpers are named by their protocol (e.g., use
1126            `hg` to allow the `git-remote-hg` helper)
1127
1128
1129Discussion[[Discussion]]
1130------------------------
1131
1132More detail on the following is available from the
1133link:user-manual.html#git-concepts[Git concepts chapter of the
1134user-manual] and linkgit:gitcore-tutorial[7].
1135
1136A Git project normally consists of a working directory with a ".git"
1137subdirectory at the top level.  The .git directory contains, among other
1138things, a compressed object database representing the complete history
1139of the project, an "index" file which links that history to the current
1140contents of the working tree, and named pointers into that history such
1141as tags and branch heads.
1142
1143The object database contains objects of three main types: blobs, which
1144hold file data; trees, which point to blobs and other trees to build up
1145directory hierarchies; and commits, which each reference a single tree
1146and some number of parent commits.
1147
1148The commit, equivalent to what other systems call a "changeset" or
1149"version", represents a step in the project's history, and each parent
1150represents an immediately preceding step.  Commits with more than one
1151parent represent merges of independent lines of development.
1152
1153All objects are named by the SHA-1 hash of their contents, normally
1154written as a string of 40 hex digits.  Such names are globally unique.
1155The entire history leading up to a commit can be vouched for by signing
1156just that commit.  A fourth object type, the tag, is provided for this
1157purpose.
1158
1159When first created, objects are stored in individual files, but for
1160efficiency may later be compressed together into "pack files".
1161
1162Named pointers called refs mark interesting points in history.  A ref
1163may contain the SHA-1 name of an object or the name of another ref.  Refs
1164with names beginning `ref/head/` contain the SHA-1 name of the most
1165recent commit (or "head") of a branch under development.  SHA-1 names of
1166tags of interest are stored under `ref/tags/`.  A special ref named
1167`HEAD` contains the name of the currently checked-out branch.
1168
1169The index file is initialized with a list of all paths and, for each
1170path, a blob object and a set of attributes.  The blob object represents
1171the contents of the file as of the head of the current branch.  The
1172attributes (last modified time, size, etc.) are taken from the
1173corresponding file in the working tree.  Subsequent changes to the
1174working tree can be found by comparing these attributes.  The index may
1175be updated with new content, and new commits may be created from the
1176content stored in the index.
1177
1178The index is also capable of storing multiple entries (called "stages")
1179for a given pathname.  These stages are used to hold the various
1180unmerged version of a file when a merge is in progress.
1181
1182FURTHER DOCUMENTATION
1183---------------------
1184
1185See the references in the "description" section to get started
1186using Git.  The following is probably more detail than necessary
1187for a first-time user.
1188
1189The link:user-manual.html#git-concepts[Git concepts chapter of the
1190user-manual] and linkgit:gitcore-tutorial[7] both provide
1191introductions to the underlying Git architecture.
1192
1193See linkgit:gitworkflows[7] for an overview of recommended workflows.
1194
1195See also the link:howto-index.html[howto] documents for some useful
1196examples.
1197
1198The internals are documented in the
1199link:technical/api-index.html[Git API documentation].
1200
1201Users migrating from CVS may also want to
1202read linkgit:gitcvs-migration[7].
1203
1204
1205Authors
1206-------
1207Git was started by Linus Torvalds, and is currently maintained by Junio
1208C Hamano. Numerous contributions have come from the Git mailing list
1209<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1210gives you a more complete list of contributors.
1211
1212If you have a clone of git.git itself, the
1213output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1214the authors for specific parts of the project.
1215
1216Reporting Bugs
1217--------------
1218
1219Report bugs to the Git mailing list <git@vger.kernel.org> where the
1220development and maintenance is primarily done.  You do not have to be
1221subscribed to the list to send a message there.
1222
1223SEE ALSO
1224--------
1225linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1226linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1227linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1228linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1229linkgit:gitworkflows[7]
1230
1231GIT
1232---
1233Part of the linkgit:git[1] suite