Documentation / git.txton commit Merge branch 'km/imap-send-libcurl-options' into maint (84a37fa)
   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:v2.3.3/git.html[documentation for release 2.3.3]
  47
  48* release notes for
  49  link:RelNotes/2.3.3.txt[2.3.3],
  50  link:RelNotes/2.3.2.txt[2.3.2],
  51  link:RelNotes/2.3.1.txt[2.3.1],
  52  link:RelNotes/2.3.0.txt[2.3].
  53
  54* link:v2.2.2/git.html[documentation for release 2.2.2]
  55
  56* release notes for
  57  link:RelNotes/2.2.2.txt[2.2.2],
  58  link:RelNotes/2.2.1.txt[2.2.1],
  59  link:RelNotes/2.2.0.txt[2.2].
  60
  61* link:v2.1.4/git.html[documentation for release 2.1.4]
  62
  63* release notes for
  64  link:RelNotes/2.1.4.txt[2.1.4],
  65  link:RelNotes/2.1.3.txt[2.1.3],
  66  link:RelNotes/2.1.2.txt[2.1.2],
  67  link:RelNotes/2.1.1.txt[2.1.1],
  68  link:RelNotes/2.1.0.txt[2.1].
  69
  70* link:v2.0.5/git.html[documentation for release 2.0.5]
  71
  72* release notes for
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  74  link:RelNotes/2.0.4.txt[2.0.4],
  75  link:RelNotes/2.0.3.txt[2.0.3],
  76  link:RelNotes/2.0.2.txt[2.0.2],
  77  link:RelNotes/2.0.1.txt[2.0.1],
  78  link:RelNotes/2.0.0.txt[2.0.0].
  79
  80* link:v1.9.5/git.html[documentation for release 1.9.5]
  81
  82* release notes for
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  84  link:RelNotes/1.9.4.txt[1.9.4],
  85  link:RelNotes/1.9.3.txt[1.9.3],
  86  link:RelNotes/1.9.2.txt[1.9.2],
  87  link:RelNotes/1.9.1.txt[1.9.1],
  88  link:RelNotes/1.9.0.txt[1.9.0].
  89
  90* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
  91
  92* release notes for
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  96  link:RelNotes/1.8.5.3.txt[1.8.5.3],
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 420  link:RelNotes/1.5.1.txt[1.5.1].
 421
 422* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 423
 424* release notes for
 425  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 426  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 427  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 428  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 429  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 430  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 431  link:RelNotes/1.5.0.txt[1.5.0].
 432
 433* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 434  link:v1.3.3/git.html[1.3.3],
 435  link:v1.2.6/git.html[1.2.6],
 436  link:v1.0.13/git.html[1.0.13].
 437
 438============
 439
 440endif::stalenotes[]
 441
 442OPTIONS
 443-------
 444--version::
 445        Prints the Git suite version that the 'git' program came from.
 446
 447--help::
 448        Prints the synopsis and a list of the most commonly used
 449        commands. If the option '--all' or '-a' is given then all
 450        available commands are printed. If a Git command is named this
 451        option will bring up the manual page for that command.
 452+
 453Other options are available to control how the manual page is
 454displayed. See linkgit:git-help[1] for more information,
 455because `git --help ...` is converted internally into `git
 456help ...`.
 457
 458-C <path>::
 459        Run as if git was started in '<path>' instead of the current working
 460        directory.  When multiple `-C` options are given, each subsequent
 461        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 462        <path>`.
 463+
 464This option affects options that expect path name like `--git-dir` and
 465`--work-tree` in that their interpretations of the path names would be
 466made relative to the working directory caused by the `-C` option. For
 467example the following invocations are equivalent:
 468
 469    git --git-dir=a.git --work-tree=b -C c status
 470    git --git-dir=c/a.git --work-tree=c/b status
 471
 472-c <name>=<value>::
 473        Pass a configuration parameter to the command. The value
 474        given will override values from configuration files.
 475        The <name> is expected in the same format as listed by
 476        'git config' (subkeys separated by dots).
 477+
 478Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 479`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 480config file). Including the equals but with an empty value (like `git -c
 481foo.bar= ...`) sets `foo.bar` to the empty string.
 482
 483--exec-path[=<path>]::
 484        Path to wherever your core Git programs are installed.
 485        This can also be controlled by setting the GIT_EXEC_PATH
 486        environment variable. If no path is given, 'git' will print
 487        the current setting and then exit.
 488
 489--html-path::
 490        Print the path, without trailing slash, where Git's HTML
 491        documentation is installed and exit.
 492
 493--man-path::
 494        Print the manpath (see `man(1)`) for the man pages for
 495        this version of Git and exit.
 496
 497--info-path::
 498        Print the path where the Info files documenting this
 499        version of Git are installed and exit.
 500
 501-p::
 502--paginate::
 503        Pipe all output into 'less' (or if set, $PAGER) if standard
 504        output is a terminal.  This overrides the `pager.<cmd>`
 505        configuration options (see the "Configuration Mechanism" section
 506        below).
 507
 508--no-pager::
 509        Do not pipe Git output into a pager.
 510
 511--git-dir=<path>::
 512        Set the path to the repository. This can also be controlled by
 513        setting the GIT_DIR environment variable. It can be an absolute
 514        path or relative path to current working directory.
 515
 516--work-tree=<path>::
 517        Set the path to the working tree. It can be an absolute path
 518        or a path relative to the current working directory.
 519        This can also be controlled by setting the GIT_WORK_TREE
 520        environment variable and the core.worktree configuration
 521        variable (see core.worktree in linkgit:git-config[1] for a
 522        more detailed discussion).
 523
 524--namespace=<path>::
 525        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 526        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 527        variable.
 528
 529--bare::
 530        Treat the repository as a bare repository.  If GIT_DIR
 531        environment is not set, it is set to the current working
 532        directory.
 533
 534--no-replace-objects::
 535        Do not use replacement refs to replace Git objects. See
 536        linkgit:git-replace[1] for more information.
 537
 538--literal-pathspecs::
 539        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 540        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 541        variable to `1`.
 542
 543--glob-pathspecs::
 544        Add "glob" magic to all pathspec. This is equivalent to setting
 545        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 546        globbing on individual pathspecs can be done using pathspec
 547        magic ":(literal)"
 548
 549--noglob-pathspecs::
 550        Add "literal" magic to all pathspec. This is equivalent to setting
 551        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 552        globbing on individual pathspecs can be done using pathspec
 553        magic ":(glob)"
 554
 555--icase-pathspecs::
 556        Add "icase" magic to all pathspec. This is equivalent to setting
 557        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 558
 559GIT COMMANDS
 560------------
 561
 562We divide Git into high level ("porcelain") commands and low level
 563("plumbing") commands.
 564
 565High-level commands (porcelain)
 566-------------------------------
 567
 568We separate the porcelain commands into the main commands and some
 569ancillary user utilities.
 570
 571Main porcelain commands
 572~~~~~~~~~~~~~~~~~~~~~~~
 573
 574include::cmds-mainporcelain.txt[]
 575
 576Ancillary Commands
 577~~~~~~~~~~~~~~~~~~
 578Manipulators:
 579
 580include::cmds-ancillarymanipulators.txt[]
 581
 582Interrogators:
 583
 584include::cmds-ancillaryinterrogators.txt[]
 585
 586
 587Interacting with Others
 588~~~~~~~~~~~~~~~~~~~~~~~
 589
 590These commands are to interact with foreign SCM and with other
 591people via patch over e-mail.
 592
 593include::cmds-foreignscminterface.txt[]
 594
 595
 596Low-level commands (plumbing)
 597-----------------------------
 598
 599Although Git includes its
 600own porcelain layer, its low-level commands are sufficient to support
 601development of alternative porcelains.  Developers of such porcelains
 602might start by reading about linkgit:git-update-index[1] and
 603linkgit:git-read-tree[1].
 604
 605The interface (input, output, set of options and the semantics)
 606to these low-level commands are meant to be a lot more stable
 607than Porcelain level commands, because these commands are
 608primarily for scripted use.  The interface to Porcelain commands
 609on the other hand are subject to change in order to improve the
 610end user experience.
 611
 612The following description divides
 613the low-level commands into commands that manipulate objects (in
 614the repository, index, and working tree), commands that interrogate and
 615compare objects, and commands that move objects and references between
 616repositories.
 617
 618
 619Manipulation commands
 620~~~~~~~~~~~~~~~~~~~~~
 621
 622include::cmds-plumbingmanipulators.txt[]
 623
 624
 625Interrogation commands
 626~~~~~~~~~~~~~~~~~~~~~~
 627
 628include::cmds-plumbinginterrogators.txt[]
 629
 630In general, the interrogate commands do not touch the files in
 631the working tree.
 632
 633
 634Synching repositories
 635~~~~~~~~~~~~~~~~~~~~~
 636
 637include::cmds-synchingrepositories.txt[]
 638
 639The following are helper commands used by the above; end users
 640typically do not use them directly.
 641
 642include::cmds-synchelpers.txt[]
 643
 644
 645Internal helper commands
 646~~~~~~~~~~~~~~~~~~~~~~~~
 647
 648These are internal helper commands used by other commands; end
 649users typically do not use them directly.
 650
 651include::cmds-purehelpers.txt[]
 652
 653
 654Configuration Mechanism
 655-----------------------
 656
 657Git uses a simple text format to store customizations that are per
 658repository and are per user.  Such a configuration file may look
 659like this:
 660
 661------------
 662#
 663# A '#' or ';' character indicates a comment.
 664#
 665
 666; core variables
 667[core]
 668        ; Don't trust file modes
 669        filemode = false
 670
 671; user identity
 672[user]
 673        name = "Junio C Hamano"
 674        email = "gitster@pobox.com"
 675
 676------------
 677
 678Various commands read from the configuration file and adjust
 679their operation accordingly.  See linkgit:git-config[1] for a
 680list and more details about the configuration mechanism.
 681
 682
 683Identifier Terminology
 684----------------------
 685<object>::
 686        Indicates the object name for any type of object.
 687
 688<blob>::
 689        Indicates a blob object name.
 690
 691<tree>::
 692        Indicates a tree object name.
 693
 694<commit>::
 695        Indicates a commit object name.
 696
 697<tree-ish>::
 698        Indicates a tree, commit or tag object name.  A
 699        command that takes a <tree-ish> argument ultimately wants to
 700        operate on a <tree> object but automatically dereferences
 701        <commit> and <tag> objects that point at a <tree>.
 702
 703<commit-ish>::
 704        Indicates a commit or tag object name.  A
 705        command that takes a <commit-ish> argument ultimately wants to
 706        operate on a <commit> object but automatically dereferences
 707        <tag> objects that point at a <commit>.
 708
 709<type>::
 710        Indicates that an object type is required.
 711        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 712
 713<file>::
 714        Indicates a filename - almost always relative to the
 715        root of the tree structure `GIT_INDEX_FILE` describes.
 716
 717Symbolic Identifiers
 718--------------------
 719Any Git command accepting any <object> can also use the following
 720symbolic notation:
 721
 722HEAD::
 723        indicates the head of the current branch.
 724
 725<tag>::
 726        a valid tag 'name'
 727        (i.e. a `refs/tags/<tag>` reference).
 728
 729<head>::
 730        a valid head 'name'
 731        (i.e. a `refs/heads/<head>` reference).
 732
 733For a more complete list of ways to spell object names, see
 734"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 735
 736
 737File/Directory Structure
 738------------------------
 739
 740Please see the linkgit:gitrepository-layout[5] document.
 741
 742Read linkgit:githooks[5] for more details about each hook.
 743
 744Higher level SCMs may provide and manage additional information in the
 745`$GIT_DIR`.
 746
 747
 748Terminology
 749-----------
 750Please see linkgit:gitglossary[7].
 751
 752
 753Environment Variables
 754---------------------
 755Various Git commands use the following environment variables:
 756
 757The Git Repository
 758~~~~~~~~~~~~~~~~~~
 759These environment variables apply to 'all' core Git commands. Nb: it
 760is worth noting that they may be used/overridden by SCMS sitting above
 761Git so take care if using Cogito etc.
 762
 763'GIT_INDEX_FILE'::
 764        This environment allows the specification of an alternate
 765        index file. If not specified, the default of `$GIT_DIR/index`
 766        is used.
 767
 768'GIT_INDEX_VERSION'::
 769        This environment variable allows the specification of an index
 770        version for new repositories.  It won't affect existing index
 771        files.  By default index file version [23] is used.
 772
 773'GIT_OBJECT_DIRECTORY'::
 774        If the object storage directory is specified via this
 775        environment variable then the sha1 directories are created
 776        underneath - otherwise the default `$GIT_DIR/objects`
 777        directory is used.
 778
 779'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 780        Due to the immutable nature of Git objects, old objects can be
 781        archived into shared, read-only directories. This variable
 782        specifies a ":" separated (on Windows ";" separated) list
 783        of Git object directories which can be used to search for Git
 784        objects. New objects will not be written to these directories.
 785
 786'GIT_DIR'::
 787        If the 'GIT_DIR' environment variable is set then it
 788        specifies a path to use instead of the default `.git`
 789        for the base of the repository.
 790        The '--git-dir' command-line option also sets this value.
 791
 792'GIT_WORK_TREE'::
 793        Set the path to the root of the working tree.
 794        This can also be controlled by the '--work-tree' command-line
 795        option and the core.worktree configuration variable.
 796
 797'GIT_NAMESPACE'::
 798        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 799        The '--namespace' command-line option also sets this value.
 800
 801'GIT_CEILING_DIRECTORIES'::
 802        This should be a colon-separated list of absolute paths.  If
 803        set, it is a list of directories that Git should not chdir up
 804        into while looking for a repository directory (useful for
 805        excluding slow-loading network directories).  It will not
 806        exclude the current working directory or a GIT_DIR set on the
 807        command line or in the environment.  Normally, Git has to read
 808        the entries in this list and resolve any symlink that
 809        might be present in order to compare them with the current
 810        directory.  However, if even this access is slow, you
 811        can add an empty entry to the list to tell Git that the
 812        subsequent entries are not symlinks and needn't be resolved;
 813        e.g.,
 814        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 815
 816'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 817        When run in a directory that does not have ".git" repository
 818        directory, Git tries to find such a directory in the parent
 819        directories to find the top of the working tree, but by default it
 820        does not cross filesystem boundaries.  This environment variable
 821        can be set to true to tell Git not to stop at filesystem
 822        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 823        an explicit repository directory set via 'GIT_DIR' or on the
 824        command line.
 825
 826Git Commits
 827~~~~~~~~~~~
 828'GIT_AUTHOR_NAME'::
 829'GIT_AUTHOR_EMAIL'::
 830'GIT_AUTHOR_DATE'::
 831'GIT_COMMITTER_NAME'::
 832'GIT_COMMITTER_EMAIL'::
 833'GIT_COMMITTER_DATE'::
 834'EMAIL'::
 835        see linkgit:git-commit-tree[1]
 836
 837Git Diffs
 838~~~~~~~~~
 839'GIT_DIFF_OPTS'::
 840        Only valid setting is "--unified=??" or "-u??" to set the
 841        number of context lines shown when a unified diff is created.
 842        This takes precedence over any "-U" or "--unified" option
 843        value passed on the Git diff command line.
 844
 845'GIT_EXTERNAL_DIFF'::
 846        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 847        program named by it is called, instead of the diff invocation
 848        described above.  For a path that is added, removed, or modified,
 849        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 850
 851        path old-file old-hex old-mode new-file new-hex new-mode
 852+
 853where:
 854
 855        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 856                         contents of <old|new>,
 857        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 858        <old|new>-mode:: are the octal representation of the file modes.
 859+
 860The file parameters can point at the user's working file
 861(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 862when a new file is added), or a temporary file (e.g. `old-file` in the
 863index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 864temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 865+
 866For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 867parameter, <path>.
 868+
 869For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 870'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 871
 872'GIT_DIFF_PATH_COUNTER'::
 873        A 1-based counter incremented by one for every path.
 874
 875'GIT_DIFF_PATH_TOTAL'::
 876        The total number of paths.
 877
 878other
 879~~~~~
 880'GIT_MERGE_VERBOSITY'::
 881        A number controlling the amount of output shown by
 882        the recursive merge strategy.  Overrides merge.verbosity.
 883        See linkgit:git-merge[1]
 884
 885'GIT_PAGER'::
 886        This environment variable overrides `$PAGER`. If it is set
 887        to an empty string or to the value "cat", Git will not launch
 888        a pager.  See also the `core.pager` option in
 889        linkgit:git-config[1].
 890
 891'GIT_EDITOR'::
 892        This environment variable overrides `$EDITOR` and `$VISUAL`.
 893        It is used by several Git commands when, on interactive mode,
 894        an editor is to be launched. See also linkgit:git-var[1]
 895        and the `core.editor` option in linkgit:git-config[1].
 896
 897'GIT_SSH'::
 898'GIT_SSH_COMMAND'::
 899        If either of these environment variables is set then 'git fetch'
 900        and 'git push' will use the specified command instead of 'ssh'
 901        when they need to connect to a remote system.
 902        The command will be given exactly two or four arguments: the
 903        'username@host' (or just 'host') from the URL and the shell
 904        command to execute on that remote system, optionally preceded by
 905        '-p' (literally) and the 'port' from the URL when it specifies
 906        something other than the default SSH port.
 907+
 908`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 909by the shell, which allows additional arguments to be included.
 910`$GIT_SSH` on the other hand must be just the path to a program
 911(which can be a wrapper shell script, if additional arguments are
 912needed).
 913+
 914Usually it is easier to configure any desired options through your
 915personal `.ssh/config` file.  Please consult your ssh documentation
 916for further details.
 917
 918'GIT_ASKPASS'::
 919        If this environment variable is set, then Git commands which need to
 920        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 921        will call this program with a suitable prompt as command-line argument
 922        and read the password from its STDOUT. See also the 'core.askpass'
 923        option in linkgit:git-config[1].
 924
 925'GIT_TERMINAL_PROMPT'::
 926        If this environment variable is set to `0`, git will not prompt
 927        on the terminal (e.g., when asking for HTTP authentication).
 928
 929'GIT_CONFIG_NOSYSTEM'::
 930        Whether to skip reading settings from the system-wide
 931        `$(prefix)/etc/gitconfig` file.  This environment variable can
 932        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 933        predictable environment for a picky script, or you can set it
 934        temporarily to avoid using a buggy `/etc/gitconfig` file while
 935        waiting for someone with sufficient permissions to fix it.
 936
 937'GIT_FLUSH'::
 938        If this environment variable is set to "1", then commands such
 939        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 940        'git check-attr' and 'git check-ignore' will
 941        force a flush of the output stream after each record have been
 942        flushed. If this
 943        variable is set to "0", the output of these commands will be done
 944        using completely buffered I/O.   If this environment variable is
 945        not set, Git will choose buffered or record-oriented flushing
 946        based on whether stdout appears to be redirected to a file or not.
 947
 948'GIT_TRACE'::
 949        Enables general trace messages, e.g. alias expansion, built-in
 950        command execution and external command execution.
 951+
 952If this variable is set to "1", "2" or "true" (comparison
 953is case insensitive), trace messages will be printed to
 954stderr.
 955+
 956If the variable is set to an integer value greater than 2
 957and lower than 10 (strictly) then Git will interpret this
 958value as an open file descriptor and will try to write the
 959trace messages into this file descriptor.
 960+
 961Alternatively, if the variable is set to an absolute path
 962(starting with a '/' character), Git will interpret this
 963as a file path and will try to write the trace messages
 964into it.
 965+
 966Unsetting the variable, or setting it to empty, "0" or
 967"false" (case insensitive) disables trace messages.
 968
 969'GIT_TRACE_PACK_ACCESS'::
 970        Enables trace messages for all accesses to any packs. For each
 971        access, the pack file name and an offset in the pack is
 972        recorded. This may be helpful for troubleshooting some
 973        pack-related performance problems.
 974        See 'GIT_TRACE' for available trace output options.
 975
 976'GIT_TRACE_PACKET'::
 977        Enables trace messages for all packets coming in or out of a
 978        given program. This can help with debugging object negotiation
 979        or other protocol issues. Tracing is turned off at a packet
 980        starting with "PACK".
 981        See 'GIT_TRACE' for available trace output options.
 982
 983'GIT_TRACE_PERFORMANCE'::
 984        Enables performance related trace messages, e.g. total execution
 985        time of each Git command.
 986        See 'GIT_TRACE' for available trace output options.
 987
 988'GIT_TRACE_SETUP'::
 989        Enables trace messages printing the .git, working tree and current
 990        working directory after Git has completed its setup phase.
 991        See 'GIT_TRACE' for available trace output options.
 992
 993'GIT_TRACE_SHALLOW'::
 994        Enables trace messages that can help debugging fetching /
 995        cloning of shallow repositories.
 996        See 'GIT_TRACE' for available trace output options.
 997
 998GIT_LITERAL_PATHSPECS::
 999        Setting this variable to `1` will cause Git to treat all
1000        pathspecs literally, rather than as glob patterns. For example,
1001        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1002        for commits that touch the path `*.c`, not any paths that the
1003        glob `*.c` matches. You might want this if you are feeding
1004        literal paths to Git (e.g., paths previously given to you by
1005        `git ls-tree`, `--raw` diff output, etc).
1006
1007GIT_GLOB_PATHSPECS::
1008        Setting this variable to `1` will cause Git to treat all
1009        pathspecs as glob patterns (aka "glob" magic).
1010
1011GIT_NOGLOB_PATHSPECS::
1012        Setting this variable to `1` will cause Git to treat all
1013        pathspecs as literal (aka "literal" magic).
1014
1015GIT_ICASE_PATHSPECS::
1016        Setting this variable to `1` will cause Git to treat all
1017        pathspecs as case-insensitive.
1018
1019'GIT_REFLOG_ACTION'::
1020        When a ref is updated, reflog entries are created to keep
1021        track of the reason why the ref was updated (which is
1022        typically the name of the high-level command that updated
1023        the ref), in addition to the old and new values of the ref.
1024        A scripted Porcelain command can use set_reflog_action
1025        helper function in `git-sh-setup` to set its name to this
1026        variable when it is invoked as the top level command by the
1027        end user, to be recorded in the body of the reflog.
1028
1029
1030Discussion[[Discussion]]
1031------------------------
1032
1033More detail on the following is available from the
1034link:user-manual.html#git-concepts[Git concepts chapter of the
1035user-manual] and linkgit:gitcore-tutorial[7].
1036
1037A Git project normally consists of a working directory with a ".git"
1038subdirectory at the top level.  The .git directory contains, among other
1039things, a compressed object database representing the complete history
1040of the project, an "index" file which links that history to the current
1041contents of the working tree, and named pointers into that history such
1042as tags and branch heads.
1043
1044The object database contains objects of three main types: blobs, which
1045hold file data; trees, which point to blobs and other trees to build up
1046directory hierarchies; and commits, which each reference a single tree
1047and some number of parent commits.
1048
1049The commit, equivalent to what other systems call a "changeset" or
1050"version", represents a step in the project's history, and each parent
1051represents an immediately preceding step.  Commits with more than one
1052parent represent merges of independent lines of development.
1053
1054All objects are named by the SHA-1 hash of their contents, normally
1055written as a string of 40 hex digits.  Such names are globally unique.
1056The entire history leading up to a commit can be vouched for by signing
1057just that commit.  A fourth object type, the tag, is provided for this
1058purpose.
1059
1060When first created, objects are stored in individual files, but for
1061efficiency may later be compressed together into "pack files".
1062
1063Named pointers called refs mark interesting points in history.  A ref
1064may contain the SHA-1 name of an object or the name of another ref.  Refs
1065with names beginning `ref/head/` contain the SHA-1 name of the most
1066recent commit (or "head") of a branch under development.  SHA-1 names of
1067tags of interest are stored under `ref/tags/`.  A special ref named
1068`HEAD` contains the name of the currently checked-out branch.
1069
1070The index file is initialized with a list of all paths and, for each
1071path, a blob object and a set of attributes.  The blob object represents
1072the contents of the file as of the head of the current branch.  The
1073attributes (last modified time, size, etc.) are taken from the
1074corresponding file in the working tree.  Subsequent changes to the
1075working tree can be found by comparing these attributes.  The index may
1076be updated with new content, and new commits may be created from the
1077content stored in the index.
1078
1079The index is also capable of storing multiple entries (called "stages")
1080for a given pathname.  These stages are used to hold the various
1081unmerged version of a file when a merge is in progress.
1082
1083FURTHER DOCUMENTATION
1084---------------------
1085
1086See the references in the "description" section to get started
1087using Git.  The following is probably more detail than necessary
1088for a first-time user.
1089
1090The link:user-manual.html#git-concepts[Git concepts chapter of the
1091user-manual] and linkgit:gitcore-tutorial[7] both provide
1092introductions to the underlying Git architecture.
1093
1094See linkgit:gitworkflows[7] for an overview of recommended workflows.
1095
1096See also the link:howto-index.html[howto] documents for some useful
1097examples.
1098
1099The internals are documented in the
1100link:technical/api-index.html[Git API documentation].
1101
1102Users migrating from CVS may also want to
1103read linkgit:gitcvs-migration[7].
1104
1105
1106Authors
1107-------
1108Git was started by Linus Torvalds, and is currently maintained by Junio
1109C Hamano. Numerous contributions have come from the Git mailing list
1110<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1111gives you a more complete list of contributors.
1112
1113If you have a clone of git.git itself, the
1114output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1115the authors for specific parts of the project.
1116
1117Reporting Bugs
1118--------------
1119
1120Report bugs to the Git mailing list <git@vger.kernel.org> where the
1121development and maintenance is primarily done.  You do not have to be
1122subscribed to the list to send a message there.
1123
1124SEE ALSO
1125--------
1126linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1127linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1128linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1129linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1130linkgit:gitworkflows[7]
1131
1132GIT
1133---
1134Part of the linkgit:git[1] suite