Documentation / git.txton commit Merge branch 'jc/diff-files-ita' (dcc883d)
   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:v2.3.0/git.html[documentation for release 2.3]
  47
  48* release notes for
  49  link:RelNotes/2.3.0.txt[2.3].
  50
  51* link:v2.2.2/git.html[documentation for release 2.2.2]
  52
  53* release notes for
  54  link:RelNotes/2.2.2.txt[2.2.2],
  55  link:RelNotes/2.2.1.txt[2.2.1],
  56  link:RelNotes/2.2.0.txt[2.2].
  57
  58* link:v2.1.4/git.html[documentation for release 2.1.4]
  59
  60* release notes for
  61  link:RelNotes/2.1.4.txt[2.1.4],
  62  link:RelNotes/2.1.3.txt[2.1.3],
  63  link:RelNotes/2.1.2.txt[2.1.2],
  64  link:RelNotes/2.1.1.txt[2.1.1],
  65  link:RelNotes/2.1.0.txt[2.1].
  66
  67* link:v2.0.5/git.html[documentation for release 2.0.5]
  68
  69* release notes for
  70  link:RelNotes/2.0.5.txt[2.0.5],
  71  link:RelNotes/2.0.4.txt[2.0.4],
  72  link:RelNotes/2.0.3.txt[2.0.3],
  73  link:RelNotes/2.0.2.txt[2.0.2],
  74  link:RelNotes/2.0.1.txt[2.0.1],
  75  link:RelNotes/2.0.0.txt[2.0.0].
  76
  77* link:v1.9.5/git.html[documentation for release 1.9.5]
  78
  79* release notes for
  80  link:RelNotes/1.9.5.txt[1.9.5],
  81  link:RelNotes/1.9.4.txt[1.9.4],
  82  link:RelNotes/1.9.3.txt[1.9.3],
  83  link:RelNotes/1.9.2.txt[1.9.2],
  84  link:RelNotes/1.9.1.txt[1.9.1],
  85  link:RelNotes/1.9.0.txt[1.9.0].
  86
  87* link:v1.8.5.6/git.html[documentation for release 1.8.5.6]
  88
  89* release notes for
  90  link:RelNotes/1.8.5.6.txt[1.8.5.6],
  91  link:RelNotes/1.8.5.5.txt[1.8.5.5],
  92  link:RelNotes/1.8.5.4.txt[1.8.5.4],
  93  link:RelNotes/1.8.5.3.txt[1.8.5.3],
  94  link:RelNotes/1.8.5.2.txt[1.8.5.2],
  95  link:RelNotes/1.8.5.1.txt[1.8.5.1],
  96  link:RelNotes/1.8.5.txt[1.8.5].
  97
  98* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
  99
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 105  link:RelNotes/1.8.4.1.txt[1.8.4.1],
 106  link:RelNotes/1.8.4.txt[1.8.4].
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 114  link:RelNotes/1.8.3.1.txt[1.8.3.1],
 115  link:RelNotes/1.8.3.txt[1.8.3].
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 123  link:RelNotes/1.8.2.txt[1.8.2].
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 125* link:v1.8.1.6/git.html[documentation for release 1.8.1.6]
 126
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 134  link:RelNotes/1.8.1.txt[1.8.1].
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 136* link:v1.8.0.3/git.html[documentation for release 1.8.0.3]
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 142  link:RelNotes/1.8.0.txt[1.8.0].
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 153* link:v1.7.11.7/git.html[documentation for release 1.7.11.7]
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 165* link:v1.7.10.5/git.html[documentation for release 1.7.10.5]
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 422  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 423  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 424  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 425  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 426  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 427  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 428  link:RelNotes/1.5.0.txt[1.5.0].
 429
 430* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 431  link:v1.3.3/git.html[1.3.3],
 432  link:v1.2.6/git.html[1.2.6],
 433  link:v1.0.13/git.html[1.0.13].
 434
 435============
 436
 437endif::stalenotes[]
 438
 439OPTIONS
 440-------
 441--version::
 442        Prints the Git suite version that the 'git' program came from.
 443
 444--help::
 445        Prints the synopsis and a list of the most commonly used
 446        commands. If the option '--all' or '-a' is given then all
 447        available commands are printed. If a Git command is named this
 448        option will bring up the manual page for that command.
 449+
 450Other options are available to control how the manual page is
 451displayed. See linkgit:git-help[1] for more information,
 452because `git --help ...` is converted internally into `git
 453help ...`.
 454
 455-C <path>::
 456        Run as if git was started in '<path>' instead of the current working
 457        directory.  When multiple `-C` options are given, each subsequent
 458        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 459        <path>`.
 460+
 461This option affects options that expect path name like `--git-dir` and
 462`--work-tree` in that their interpretations of the path names would be
 463made relative to the working directory caused by the `-C` option. For
 464example the following invocations are equivalent:
 465
 466    git --git-dir=a.git --work-tree=b -C c status
 467    git --git-dir=c/a.git --work-tree=c/b status
 468
 469-c <name>=<value>::
 470        Pass a configuration parameter to the command. The value
 471        given will override values from configuration files.
 472        The <name> is expected in the same format as listed by
 473        'git config' (subkeys separated by dots).
 474+
 475Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 476`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 477config file). Including the equals but with an empty value (like `git -c
 478foo.bar= ...`) sets `foo.bar` to the empty string.
 479
 480--exec-path[=<path>]::
 481        Path to wherever your core Git programs are installed.
 482        This can also be controlled by setting the GIT_EXEC_PATH
 483        environment variable. If no path is given, 'git' will print
 484        the current setting and then exit.
 485
 486--html-path::
 487        Print the path, without trailing slash, where Git's HTML
 488        documentation is installed and exit.
 489
 490--man-path::
 491        Print the manpath (see `man(1)`) for the man pages for
 492        this version of Git and exit.
 493
 494--info-path::
 495        Print the path where the Info files documenting this
 496        version of Git are installed and exit.
 497
 498-p::
 499--paginate::
 500        Pipe all output into 'less' (or if set, $PAGER) if standard
 501        output is a terminal.  This overrides the `pager.<cmd>`
 502        configuration options (see the "Configuration Mechanism" section
 503        below).
 504
 505--no-pager::
 506        Do not pipe Git output into a pager.
 507
 508--git-dir=<path>::
 509        Set the path to the repository. This can also be controlled by
 510        setting the GIT_DIR environment variable. It can be an absolute
 511        path or relative path to current working directory.
 512
 513--work-tree=<path>::
 514        Set the path to the working tree. It can be an absolute path
 515        or a path relative to the current working directory.
 516        This can also be controlled by setting the GIT_WORK_TREE
 517        environment variable and the core.worktree configuration
 518        variable (see core.worktree in linkgit:git-config[1] for a
 519        more detailed discussion).
 520
 521--namespace=<path>::
 522        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 523        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 524        variable.
 525
 526--bare::
 527        Treat the repository as a bare repository.  If GIT_DIR
 528        environment is not set, it is set to the current working
 529        directory.
 530
 531--no-replace-objects::
 532        Do not use replacement refs to replace Git objects. See
 533        linkgit:git-replace[1] for more information.
 534
 535--literal-pathspecs::
 536        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 537        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 538        variable to `1`.
 539
 540--glob-pathspecs::
 541        Add "glob" magic to all pathspec. This is equivalent to setting
 542        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 543        globbing on individual pathspecs can be done using pathspec
 544        magic ":(literal)"
 545
 546--noglob-pathspecs::
 547        Add "literal" magic to all pathspec. This is equivalent to setting
 548        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 549        globbing on individual pathspecs can be done using pathspec
 550        magic ":(glob)"
 551
 552--icase-pathspecs::
 553        Add "icase" magic to all pathspec. This is equivalent to setting
 554        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 555
 556GIT COMMANDS
 557------------
 558
 559We divide Git into high level ("porcelain") commands and low level
 560("plumbing") commands.
 561
 562High-level commands (porcelain)
 563-------------------------------
 564
 565We separate the porcelain commands into the main commands and some
 566ancillary user utilities.
 567
 568Main porcelain commands
 569~~~~~~~~~~~~~~~~~~~~~~~
 570
 571include::cmds-mainporcelain.txt[]
 572
 573Ancillary Commands
 574~~~~~~~~~~~~~~~~~~
 575Manipulators:
 576
 577include::cmds-ancillarymanipulators.txt[]
 578
 579Interrogators:
 580
 581include::cmds-ancillaryinterrogators.txt[]
 582
 583
 584Interacting with Others
 585~~~~~~~~~~~~~~~~~~~~~~~
 586
 587These commands are to interact with foreign SCM and with other
 588people via patch over e-mail.
 589
 590include::cmds-foreignscminterface.txt[]
 591
 592
 593Low-level commands (plumbing)
 594-----------------------------
 595
 596Although Git includes its
 597own porcelain layer, its low-level commands are sufficient to support
 598development of alternative porcelains.  Developers of such porcelains
 599might start by reading about linkgit:git-update-index[1] and
 600linkgit:git-read-tree[1].
 601
 602The interface (input, output, set of options and the semantics)
 603to these low-level commands are meant to be a lot more stable
 604than Porcelain level commands, because these commands are
 605primarily for scripted use.  The interface to Porcelain commands
 606on the other hand are subject to change in order to improve the
 607end user experience.
 608
 609The following description divides
 610the low-level commands into commands that manipulate objects (in
 611the repository, index, and working tree), commands that interrogate and
 612compare objects, and commands that move objects and references between
 613repositories.
 614
 615
 616Manipulation commands
 617~~~~~~~~~~~~~~~~~~~~~
 618
 619include::cmds-plumbingmanipulators.txt[]
 620
 621
 622Interrogation commands
 623~~~~~~~~~~~~~~~~~~~~~~
 624
 625include::cmds-plumbinginterrogators.txt[]
 626
 627In general, the interrogate commands do not touch the files in
 628the working tree.
 629
 630
 631Synching repositories
 632~~~~~~~~~~~~~~~~~~~~~
 633
 634include::cmds-synchingrepositories.txt[]
 635
 636The following are helper commands used by the above; end users
 637typically do not use them directly.
 638
 639include::cmds-synchelpers.txt[]
 640
 641
 642Internal helper commands
 643~~~~~~~~~~~~~~~~~~~~~~~~
 644
 645These are internal helper commands used by other commands; end
 646users typically do not use them directly.
 647
 648include::cmds-purehelpers.txt[]
 649
 650
 651Configuration Mechanism
 652-----------------------
 653
 654Git uses a simple text format to store customizations that are per
 655repository and are per user.  Such a configuration file may look
 656like this:
 657
 658------------
 659#
 660# A '#' or ';' character indicates a comment.
 661#
 662
 663; core variables
 664[core]
 665        ; Don't trust file modes
 666        filemode = false
 667
 668; user identity
 669[user]
 670        name = "Junio C Hamano"
 671        email = "gitster@pobox.com"
 672
 673------------
 674
 675Various commands read from the configuration file and adjust
 676their operation accordingly.  See linkgit:git-config[1] for a
 677list and more details about the configuration mechanism.
 678
 679
 680Identifier Terminology
 681----------------------
 682<object>::
 683        Indicates the object name for any type of object.
 684
 685<blob>::
 686        Indicates a blob object name.
 687
 688<tree>::
 689        Indicates a tree object name.
 690
 691<commit>::
 692        Indicates a commit object name.
 693
 694<tree-ish>::
 695        Indicates a tree, commit or tag object name.  A
 696        command that takes a <tree-ish> argument ultimately wants to
 697        operate on a <tree> object but automatically dereferences
 698        <commit> and <tag> objects that point at a <tree>.
 699
 700<commit-ish>::
 701        Indicates a commit or tag object name.  A
 702        command that takes a <commit-ish> argument ultimately wants to
 703        operate on a <commit> object but automatically dereferences
 704        <tag> objects that point at a <commit>.
 705
 706<type>::
 707        Indicates that an object type is required.
 708        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 709
 710<file>::
 711        Indicates a filename - almost always relative to the
 712        root of the tree structure `GIT_INDEX_FILE` describes.
 713
 714Symbolic Identifiers
 715--------------------
 716Any Git command accepting any <object> can also use the following
 717symbolic notation:
 718
 719HEAD::
 720        indicates the head of the current branch.
 721
 722<tag>::
 723        a valid tag 'name'
 724        (i.e. a `refs/tags/<tag>` reference).
 725
 726<head>::
 727        a valid head 'name'
 728        (i.e. a `refs/heads/<head>` reference).
 729
 730For a more complete list of ways to spell object names, see
 731"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 732
 733
 734File/Directory Structure
 735------------------------
 736
 737Please see the linkgit:gitrepository-layout[5] document.
 738
 739Read linkgit:githooks[5] for more details about each hook.
 740
 741Higher level SCMs may provide and manage additional information in the
 742`$GIT_DIR`.
 743
 744
 745Terminology
 746-----------
 747Please see linkgit:gitglossary[7].
 748
 749
 750Environment Variables
 751---------------------
 752Various Git commands use the following environment variables:
 753
 754The Git Repository
 755~~~~~~~~~~~~~~~~~~
 756These environment variables apply to 'all' core Git commands. Nb: it
 757is worth noting that they may be used/overridden by SCMS sitting above
 758Git so take care if using Cogito etc.
 759
 760'GIT_INDEX_FILE'::
 761        This environment allows the specification of an alternate
 762        index file. If not specified, the default of `$GIT_DIR/index`
 763        is used.
 764
 765'GIT_INDEX_VERSION'::
 766        This environment variable allows the specification of an index
 767        version for new repositories.  It won't affect existing index
 768        files.  By default index file version [23] is used.
 769
 770'GIT_OBJECT_DIRECTORY'::
 771        If the object storage directory is specified via this
 772        environment variable then the sha1 directories are created
 773        underneath - otherwise the default `$GIT_DIR/objects`
 774        directory is used.
 775
 776'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 777        Due to the immutable nature of Git objects, old objects can be
 778        archived into shared, read-only directories. This variable
 779        specifies a ":" separated (on Windows ";" separated) list
 780        of Git object directories which can be used to search for Git
 781        objects. New objects will not be written to these directories.
 782
 783'GIT_DIR'::
 784        If the 'GIT_DIR' environment variable is set then it
 785        specifies a path to use instead of the default `.git`
 786        for the base of the repository.
 787        The '--git-dir' command-line option also sets this value.
 788
 789'GIT_WORK_TREE'::
 790        Set the path to the root of the working tree.
 791        This can also be controlled by the '--work-tree' command-line
 792        option and the core.worktree configuration variable.
 793
 794'GIT_NAMESPACE'::
 795        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 796        The '--namespace' command-line option also sets this value.
 797
 798'GIT_CEILING_DIRECTORIES'::
 799        This should be a colon-separated list of absolute paths.  If
 800        set, it is a list of directories that Git should not chdir up
 801        into while looking for a repository directory (useful for
 802        excluding slow-loading network directories).  It will not
 803        exclude the current working directory or a GIT_DIR set on the
 804        command line or in the environment.  Normally, Git has to read
 805        the entries in this list and resolve any symlink that
 806        might be present in order to compare them with the current
 807        directory.  However, if even this access is slow, you
 808        can add an empty entry to the list to tell Git that the
 809        subsequent entries are not symlinks and needn't be resolved;
 810        e.g.,
 811        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 812
 813'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 814        When run in a directory that does not have ".git" repository
 815        directory, Git tries to find such a directory in the parent
 816        directories to find the top of the working tree, but by default it
 817        does not cross filesystem boundaries.  This environment variable
 818        can be set to true to tell Git not to stop at filesystem
 819        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 820        an explicit repository directory set via 'GIT_DIR' or on the
 821        command line.
 822
 823Git Commits
 824~~~~~~~~~~~
 825'GIT_AUTHOR_NAME'::
 826'GIT_AUTHOR_EMAIL'::
 827'GIT_AUTHOR_DATE'::
 828'GIT_COMMITTER_NAME'::
 829'GIT_COMMITTER_EMAIL'::
 830'GIT_COMMITTER_DATE'::
 831'EMAIL'::
 832        see linkgit:git-commit-tree[1]
 833
 834Git Diffs
 835~~~~~~~~~
 836'GIT_DIFF_OPTS'::
 837        Only valid setting is "--unified=??" or "-u??" to set the
 838        number of context lines shown when a unified diff is created.
 839        This takes precedence over any "-U" or "--unified" option
 840        value passed on the Git diff command line.
 841
 842'GIT_EXTERNAL_DIFF'::
 843        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 844        program named by it is called, instead of the diff invocation
 845        described above.  For a path that is added, removed, or modified,
 846        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 847
 848        path old-file old-hex old-mode new-file new-hex new-mode
 849+
 850where:
 851
 852        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 853                         contents of <old|new>,
 854        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 855        <old|new>-mode:: are the octal representation of the file modes.
 856+
 857The file parameters can point at the user's working file
 858(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 859when a new file is added), or a temporary file (e.g. `old-file` in the
 860index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 861temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 862+
 863For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 864parameter, <path>.
 865+
 866For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 867'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 868
 869'GIT_DIFF_PATH_COUNTER'::
 870        A 1-based counter incremented by one for every path.
 871
 872'GIT_DIFF_PATH_TOTAL'::
 873        The total number of paths.
 874
 875other
 876~~~~~
 877'GIT_MERGE_VERBOSITY'::
 878        A number controlling the amount of output shown by
 879        the recursive merge strategy.  Overrides merge.verbosity.
 880        See linkgit:git-merge[1]
 881
 882'GIT_PAGER'::
 883        This environment variable overrides `$PAGER`. If it is set
 884        to an empty string or to the value "cat", Git will not launch
 885        a pager.  See also the `core.pager` option in
 886        linkgit:git-config[1].
 887
 888'GIT_EDITOR'::
 889        This environment variable overrides `$EDITOR` and `$VISUAL`.
 890        It is used by several Git commands when, on interactive mode,
 891        an editor is to be launched. See also linkgit:git-var[1]
 892        and the `core.editor` option in linkgit:git-config[1].
 893
 894'GIT_SSH'::
 895'GIT_SSH_COMMAND'::
 896        If either of these environment variables is set then 'git fetch'
 897        and 'git push' will use the specified command instead of 'ssh'
 898        when they need to connect to a remote system.
 899        The command will be given exactly two or four arguments: the
 900        'username@host' (or just 'host') from the URL and the shell
 901        command to execute on that remote system, optionally preceded by
 902        '-p' (literally) and the 'port' from the URL when it specifies
 903        something other than the default SSH port.
 904+
 905`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 906by the shell, which allows additional arguments to be included.
 907`$GIT_SSH` on the other hand must be just the path to a program
 908(which can be a wrapper shell script, if additional arguments are
 909needed).
 910+
 911Usually it is easier to configure any desired options through your
 912personal `.ssh/config` file.  Please consult your ssh documentation
 913for further details.
 914
 915'GIT_ASKPASS'::
 916        If this environment variable is set, then Git commands which need to
 917        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 918        will call this program with a suitable prompt as command-line argument
 919        and read the password from its STDOUT. See also the 'core.askpass'
 920        option in linkgit:git-config[1].
 921
 922'GIT_TERMINAL_PROMPT'::
 923        If this environment variable is set to `0`, git will not prompt
 924        on the terminal (e.g., when asking for HTTP authentication).
 925
 926'GIT_CONFIG_NOSYSTEM'::
 927        Whether to skip reading settings from the system-wide
 928        `$(prefix)/etc/gitconfig` file.  This environment variable can
 929        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 930        predictable environment for a picky script, or you can set it
 931        temporarily to avoid using a buggy `/etc/gitconfig` file while
 932        waiting for someone with sufficient permissions to fix it.
 933
 934'GIT_FLUSH'::
 935        If this environment variable is set to "1", then commands such
 936        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 937        'git check-attr' and 'git check-ignore' will
 938        force a flush of the output stream after each record have been
 939        flushed. If this
 940        variable is set to "0", the output of these commands will be done
 941        using completely buffered I/O.   If this environment variable is
 942        not set, Git will choose buffered or record-oriented flushing
 943        based on whether stdout appears to be redirected to a file or not.
 944
 945'GIT_TRACE'::
 946        Enables general trace messages, e.g. alias expansion, built-in
 947        command execution and external command execution.
 948+
 949If this variable is set to "1", "2" or "true" (comparison
 950is case insensitive), trace messages will be printed to
 951stderr.
 952+
 953If the variable is set to an integer value greater than 2
 954and lower than 10 (strictly) then Git will interpret this
 955value as an open file descriptor and will try to write the
 956trace messages into this file descriptor.
 957+
 958Alternatively, if the variable is set to an absolute path
 959(starting with a '/' character), Git will interpret this
 960as a file path and will try to write the trace messages
 961into it.
 962+
 963Unsetting the variable, or setting it to empty, "0" or
 964"false" (case insensitive) disables trace messages.
 965
 966'GIT_TRACE_PACK_ACCESS'::
 967        Enables trace messages for all accesses to any packs. For each
 968        access, the pack file name and an offset in the pack is
 969        recorded. This may be helpful for troubleshooting some
 970        pack-related performance problems.
 971        See 'GIT_TRACE' for available trace output options.
 972
 973'GIT_TRACE_PACKET'::
 974        Enables trace messages for all packets coming in or out of a
 975        given program. This can help with debugging object negotiation
 976        or other protocol issues. Tracing is turned off at a packet
 977        starting with "PACK".
 978        See 'GIT_TRACE' for available trace output options.
 979
 980'GIT_TRACE_PERFORMANCE'::
 981        Enables performance related trace messages, e.g. total execution
 982        time of each Git command.
 983        See 'GIT_TRACE' for available trace output options.
 984
 985'GIT_TRACE_SETUP'::
 986        Enables trace messages printing the .git, working tree and current
 987        working directory after Git has completed its setup phase.
 988        See 'GIT_TRACE' for available trace output options.
 989
 990'GIT_TRACE_SHALLOW'::
 991        Enables trace messages that can help debugging fetching /
 992        cloning of shallow repositories.
 993        See 'GIT_TRACE' for available trace output options.
 994
 995GIT_LITERAL_PATHSPECS::
 996        Setting this variable to `1` will cause Git to treat all
 997        pathspecs literally, rather than as glob patterns. For example,
 998        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
 999        for commits that touch the path `*.c`, not any paths that the
1000        glob `*.c` matches. You might want this if you are feeding
1001        literal paths to Git (e.g., paths previously given to you by
1002        `git ls-tree`, `--raw` diff output, etc).
1003
1004GIT_GLOB_PATHSPECS::
1005        Setting this variable to `1` will cause Git to treat all
1006        pathspecs as glob patterns (aka "glob" magic).
1007
1008GIT_NOGLOB_PATHSPECS::
1009        Setting this variable to `1` will cause Git to treat all
1010        pathspecs as literal (aka "literal" magic).
1011
1012GIT_ICASE_PATHSPECS::
1013        Setting this variable to `1` will cause Git to treat all
1014        pathspecs as case-insensitive.
1015
1016'GIT_REFLOG_ACTION'::
1017        When a ref is updated, reflog entries are created to keep
1018        track of the reason why the ref was updated (which is
1019        typically the name of the high-level command that updated
1020        the ref), in addition to the old and new values of the ref.
1021        A scripted Porcelain command can use set_reflog_action
1022        helper function in `git-sh-setup` to set its name to this
1023        variable when it is invoked as the top level command by the
1024        end user, to be recorded in the body of the reflog.
1025
1026
1027Discussion[[Discussion]]
1028------------------------
1029
1030More detail on the following is available from the
1031link:user-manual.html#git-concepts[Git concepts chapter of the
1032user-manual] and linkgit:gitcore-tutorial[7].
1033
1034A Git project normally consists of a working directory with a ".git"
1035subdirectory at the top level.  The .git directory contains, among other
1036things, a compressed object database representing the complete history
1037of the project, an "index" file which links that history to the current
1038contents of the working tree, and named pointers into that history such
1039as tags and branch heads.
1040
1041The object database contains objects of three main types: blobs, which
1042hold file data; trees, which point to blobs and other trees to build up
1043directory hierarchies; and commits, which each reference a single tree
1044and some number of parent commits.
1045
1046The commit, equivalent to what other systems call a "changeset" or
1047"version", represents a step in the project's history, and each parent
1048represents an immediately preceding step.  Commits with more than one
1049parent represent merges of independent lines of development.
1050
1051All objects are named by the SHA-1 hash of their contents, normally
1052written as a string of 40 hex digits.  Such names are globally unique.
1053The entire history leading up to a commit can be vouched for by signing
1054just that commit.  A fourth object type, the tag, is provided for this
1055purpose.
1056
1057When first created, objects are stored in individual files, but for
1058efficiency may later be compressed together into "pack files".
1059
1060Named pointers called refs mark interesting points in history.  A ref
1061may contain the SHA-1 name of an object or the name of another ref.  Refs
1062with names beginning `ref/head/` contain the SHA-1 name of the most
1063recent commit (or "head") of a branch under development.  SHA-1 names of
1064tags of interest are stored under `ref/tags/`.  A special ref named
1065`HEAD` contains the name of the currently checked-out branch.
1066
1067The index file is initialized with a list of all paths and, for each
1068path, a blob object and a set of attributes.  The blob object represents
1069the contents of the file as of the head of the current branch.  The
1070attributes (last modified time, size, etc.) are taken from the
1071corresponding file in the working tree.  Subsequent changes to the
1072working tree can be found by comparing these attributes.  The index may
1073be updated with new content, and new commits may be created from the
1074content stored in the index.
1075
1076The index is also capable of storing multiple entries (called "stages")
1077for a given pathname.  These stages are used to hold the various
1078unmerged version of a file when a merge is in progress.
1079
1080FURTHER DOCUMENTATION
1081---------------------
1082
1083See the references in the "description" section to get started
1084using Git.  The following is probably more detail than necessary
1085for a first-time user.
1086
1087The link:user-manual.html#git-concepts[Git concepts chapter of the
1088user-manual] and linkgit:gitcore-tutorial[7] both provide
1089introductions to the underlying Git architecture.
1090
1091See linkgit:gitworkflows[7] for an overview of recommended workflows.
1092
1093See also the link:howto-index.html[howto] documents for some useful
1094examples.
1095
1096The internals are documented in the
1097link:technical/api-index.html[Git API documentation].
1098
1099Users migrating from CVS may also want to
1100read linkgit:gitcvs-migration[7].
1101
1102
1103Authors
1104-------
1105Git was started by Linus Torvalds, and is currently maintained by Junio
1106C Hamano. Numerous contributions have come from the Git mailing list
1107<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1108gives you a more complete list of contributors.
1109
1110If you have a clone of git.git itself, the
1111output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1112the authors for specific parts of the project.
1113
1114Reporting Bugs
1115--------------
1116
1117Report bugs to the Git mailing list <git@vger.kernel.org> where the
1118development and maintenance is primarily done.  You do not have to be
1119subscribed to the list to send a message there.
1120
1121SEE ALSO
1122--------
1123linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1124linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1125linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1126linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1127linkgit:gitworkflows[7]
1128
1129GIT
1130---
1131Part of the linkgit:git[1] suite