Documentation / git.txton commit blame: improve diagnosis for "--reverse NEW" (d993ce1)
   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
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 429* release notes for
 430  link:RelNotes/1.5.5.6.txt[1.5.5.6],
 431  link:RelNotes/1.5.5.5.txt[1.5.5.5],
 432  link:RelNotes/1.5.5.4.txt[1.5.5.4],
 433  link:RelNotes/1.5.5.3.txt[1.5.5.3],
 434  link:RelNotes/1.5.5.2.txt[1.5.5.2],
 435  link:RelNotes/1.5.5.1.txt[1.5.5.1],
 436  link:RelNotes/1.5.5.txt[1.5.5].
 437
 438* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
 439
 440* release notes for
 441  link:RelNotes/1.5.4.7.txt[1.5.4.7],
 442  link:RelNotes/1.5.4.6.txt[1.5.4.6],
 443  link:RelNotes/1.5.4.5.txt[1.5.4.5],
 444  link:RelNotes/1.5.4.4.txt[1.5.4.4],
 445  link:RelNotes/1.5.4.3.txt[1.5.4.3],
 446  link:RelNotes/1.5.4.2.txt[1.5.4.2],
 447  link:RelNotes/1.5.4.1.txt[1.5.4.1],
 448  link:RelNotes/1.5.4.txt[1.5.4].
 449
 450* link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
 451
 452* release notes for
 453  link:RelNotes/1.5.3.8.txt[1.5.3.8],
 454  link:RelNotes/1.5.3.7.txt[1.5.3.7],
 455  link:RelNotes/1.5.3.6.txt[1.5.3.6],
 456  link:RelNotes/1.5.3.5.txt[1.5.3.5],
 457  link:RelNotes/1.5.3.4.txt[1.5.3.4],
 458  link:RelNotes/1.5.3.3.txt[1.5.3.3],
 459  link:RelNotes/1.5.3.2.txt[1.5.3.2],
 460  link:RelNotes/1.5.3.1.txt[1.5.3.1],
 461  link:RelNotes/1.5.3.txt[1.5.3].
 462
 463* link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
 464
 465* release notes for
 466  link:RelNotes/1.5.2.5.txt[1.5.2.5],
 467  link:RelNotes/1.5.2.4.txt[1.5.2.4],
 468  link:RelNotes/1.5.2.3.txt[1.5.2.3],
 469  link:RelNotes/1.5.2.2.txt[1.5.2.2],
 470  link:RelNotes/1.5.2.1.txt[1.5.2.1],
 471  link:RelNotes/1.5.2.txt[1.5.2].
 472
 473* link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
 474
 475* release notes for
 476  link:RelNotes/1.5.1.6.txt[1.5.1.6],
 477  link:RelNotes/1.5.1.5.txt[1.5.1.5],
 478  link:RelNotes/1.5.1.4.txt[1.5.1.4],
 479  link:RelNotes/1.5.1.3.txt[1.5.1.3],
 480  link:RelNotes/1.5.1.2.txt[1.5.1.2],
 481  link:RelNotes/1.5.1.1.txt[1.5.1.1],
 482  link:RelNotes/1.5.1.txt[1.5.1].
 483
 484* link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
 485
 486* release notes for
 487  link:RelNotes/1.5.0.7.txt[1.5.0.7],
 488  link:RelNotes/1.5.0.6.txt[1.5.0.6],
 489  link:RelNotes/1.5.0.5.txt[1.5.0.5],
 490  link:RelNotes/1.5.0.3.txt[1.5.0.3],
 491  link:RelNotes/1.5.0.2.txt[1.5.0.2],
 492  link:RelNotes/1.5.0.1.txt[1.5.0.1],
 493  link:RelNotes/1.5.0.txt[1.5.0].
 494
 495* documentation for release link:v1.4.4.4/git.html[1.4.4.4],
 496  link:v1.3.3/git.html[1.3.3],
 497  link:v1.2.6/git.html[1.2.6],
 498  link:v1.0.13/git.html[1.0.13].
 499
 500============
 501
 502endif::stalenotes[]
 503
 504OPTIONS
 505-------
 506--version::
 507        Prints the Git suite version that the 'git' program came from.
 508
 509--help::
 510        Prints the synopsis and a list of the most commonly used
 511        commands. If the option '--all' or '-a' is given then all
 512        available commands are printed. If a Git command is named this
 513        option will bring up the manual page for that command.
 514+
 515Other options are available to control how the manual page is
 516displayed. See linkgit:git-help[1] for more information,
 517because `git --help ...` is converted internally into `git
 518help ...`.
 519
 520-C <path>::
 521        Run as if git was started in '<path>' instead of the current working
 522        directory.  When multiple `-C` options are given, each subsequent
 523        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 524        <path>`.
 525+
 526This option affects options that expect path name like `--git-dir` and
 527`--work-tree` in that their interpretations of the path names would be
 528made relative to the working directory caused by the `-C` option. For
 529example the following invocations are equivalent:
 530
 531    git --git-dir=a.git --work-tree=b -C c status
 532    git --git-dir=c/a.git --work-tree=c/b status
 533
 534-c <name>=<value>::
 535        Pass a configuration parameter to the command. The value
 536        given will override values from configuration files.
 537        The <name> is expected in the same format as listed by
 538        'git config' (subkeys separated by dots).
 539+
 540Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 541`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 542config file). Including the equals but with an empty value (like `git -c
 543foo.bar= ...`) sets `foo.bar` to the empty string.
 544
 545--exec-path[=<path>]::
 546        Path to wherever your core Git programs are installed.
 547        This can also be controlled by setting the GIT_EXEC_PATH
 548        environment variable. If no path is given, 'git' will print
 549        the current setting and then exit.
 550
 551--html-path::
 552        Print the path, without trailing slash, where Git's HTML
 553        documentation is installed and exit.
 554
 555--man-path::
 556        Print the manpath (see `man(1)`) for the man pages for
 557        this version of Git and exit.
 558
 559--info-path::
 560        Print the path where the Info files documenting this
 561        version of Git are installed and exit.
 562
 563-p::
 564--paginate::
 565        Pipe all output into 'less' (or if set, $PAGER) if standard
 566        output is a terminal.  This overrides the `pager.<cmd>`
 567        configuration options (see the "Configuration Mechanism" section
 568        below).
 569
 570--no-pager::
 571        Do not pipe Git output into a pager.
 572
 573--git-dir=<path>::
 574        Set the path to the repository. This can also be controlled by
 575        setting the GIT_DIR environment variable. It can be an absolute
 576        path or relative path to current working directory.
 577
 578--work-tree=<path>::
 579        Set the path to the working tree. It can be an absolute path
 580        or a path relative to the current working directory.
 581        This can also be controlled by setting the GIT_WORK_TREE
 582        environment variable and the core.worktree configuration
 583        variable (see core.worktree in linkgit:git-config[1] for a
 584        more detailed discussion).
 585
 586--namespace=<path>::
 587        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 588        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 589        variable.
 590
 591--bare::
 592        Treat the repository as a bare repository.  If GIT_DIR
 593        environment is not set, it is set to the current working
 594        directory.
 595
 596--no-replace-objects::
 597        Do not use replacement refs to replace Git objects. See
 598        linkgit:git-replace[1] for more information.
 599
 600--literal-pathspecs::
 601        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 602        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 603        variable to `1`.
 604
 605--glob-pathspecs::
 606        Add "glob" magic to all pathspec. This is equivalent to setting
 607        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 608        globbing on individual pathspecs can be done using pathspec
 609        magic ":(literal)"
 610
 611--noglob-pathspecs::
 612        Add "literal" magic to all pathspec. This is equivalent to setting
 613        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 614        globbing on individual pathspecs can be done using pathspec
 615        magic ":(glob)"
 616
 617--icase-pathspecs::
 618        Add "icase" magic to all pathspec. This is equivalent to setting
 619        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 620
 621GIT COMMANDS
 622------------
 623
 624We divide Git into high level ("porcelain") commands and low level
 625("plumbing") commands.
 626
 627High-level commands (porcelain)
 628-------------------------------
 629
 630We separate the porcelain commands into the main commands and some
 631ancillary user utilities.
 632
 633Main porcelain commands
 634~~~~~~~~~~~~~~~~~~~~~~~
 635
 636include::cmds-mainporcelain.txt[]
 637
 638Ancillary Commands
 639~~~~~~~~~~~~~~~~~~
 640Manipulators:
 641
 642include::cmds-ancillarymanipulators.txt[]
 643
 644Interrogators:
 645
 646include::cmds-ancillaryinterrogators.txt[]
 647
 648
 649Interacting with Others
 650~~~~~~~~~~~~~~~~~~~~~~~
 651
 652These commands are to interact with foreign SCM and with other
 653people via patch over e-mail.
 654
 655include::cmds-foreignscminterface.txt[]
 656
 657
 658Low-level commands (plumbing)
 659-----------------------------
 660
 661Although Git includes its
 662own porcelain layer, its low-level commands are sufficient to support
 663development of alternative porcelains.  Developers of such porcelains
 664might start by reading about linkgit:git-update-index[1] and
 665linkgit:git-read-tree[1].
 666
 667The interface (input, output, set of options and the semantics)
 668to these low-level commands are meant to be a lot more stable
 669than Porcelain level commands, because these commands are
 670primarily for scripted use.  The interface to Porcelain commands
 671on the other hand are subject to change in order to improve the
 672end user experience.
 673
 674The following description divides
 675the low-level commands into commands that manipulate objects (in
 676the repository, index, and working tree), commands that interrogate and
 677compare objects, and commands that move objects and references between
 678repositories.
 679
 680
 681Manipulation commands
 682~~~~~~~~~~~~~~~~~~~~~
 683
 684include::cmds-plumbingmanipulators.txt[]
 685
 686
 687Interrogation commands
 688~~~~~~~~~~~~~~~~~~~~~~
 689
 690include::cmds-plumbinginterrogators.txt[]
 691
 692In general, the interrogate commands do not touch the files in
 693the working tree.
 694
 695
 696Synching repositories
 697~~~~~~~~~~~~~~~~~~~~~
 698
 699include::cmds-synchingrepositories.txt[]
 700
 701The following are helper commands used by the above; end users
 702typically do not use them directly.
 703
 704include::cmds-synchelpers.txt[]
 705
 706
 707Internal helper commands
 708~~~~~~~~~~~~~~~~~~~~~~~~
 709
 710These are internal helper commands used by other commands; end
 711users typically do not use them directly.
 712
 713include::cmds-purehelpers.txt[]
 714
 715
 716Configuration Mechanism
 717-----------------------
 718
 719Git uses a simple text format to store customizations that are per
 720repository and are per user.  Such a configuration file may look
 721like this:
 722
 723------------
 724#
 725# A '#' or ';' character indicates a comment.
 726#
 727
 728; core variables
 729[core]
 730        ; Don't trust file modes
 731        filemode = false
 732
 733; user identity
 734[user]
 735        name = "Junio C Hamano"
 736        email = "gitster@pobox.com"
 737
 738------------
 739
 740Various commands read from the configuration file and adjust
 741their operation accordingly.  See linkgit:git-config[1] for a
 742list and more details about the configuration mechanism.
 743
 744
 745Identifier Terminology
 746----------------------
 747<object>::
 748        Indicates the object name for any type of object.
 749
 750<blob>::
 751        Indicates a blob object name.
 752
 753<tree>::
 754        Indicates a tree object name.
 755
 756<commit>::
 757        Indicates a commit object name.
 758
 759<tree-ish>::
 760        Indicates a tree, commit or tag object name.  A
 761        command that takes a <tree-ish> argument ultimately wants to
 762        operate on a <tree> object but automatically dereferences
 763        <commit> and <tag> objects that point at a <tree>.
 764
 765<commit-ish>::
 766        Indicates a commit or tag object name.  A
 767        command that takes a <commit-ish> argument ultimately wants to
 768        operate on a <commit> object but automatically dereferences
 769        <tag> objects that point at a <commit>.
 770
 771<type>::
 772        Indicates that an object type is required.
 773        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 774
 775<file>::
 776        Indicates a filename - almost always relative to the
 777        root of the tree structure `GIT_INDEX_FILE` describes.
 778
 779Symbolic Identifiers
 780--------------------
 781Any Git command accepting any <object> can also use the following
 782symbolic notation:
 783
 784HEAD::
 785        indicates the head of the current branch.
 786
 787<tag>::
 788        a valid tag 'name'
 789        (i.e. a `refs/tags/<tag>` reference).
 790
 791<head>::
 792        a valid head 'name'
 793        (i.e. a `refs/heads/<head>` reference).
 794
 795For a more complete list of ways to spell object names, see
 796"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 797
 798
 799File/Directory Structure
 800------------------------
 801
 802Please see the linkgit:gitrepository-layout[5] document.
 803
 804Read linkgit:githooks[5] for more details about each hook.
 805
 806Higher level SCMs may provide and manage additional information in the
 807`$GIT_DIR`.
 808
 809
 810Terminology
 811-----------
 812Please see linkgit:gitglossary[7].
 813
 814
 815Environment Variables
 816---------------------
 817Various Git commands use the following environment variables:
 818
 819The Git Repository
 820~~~~~~~~~~~~~~~~~~
 821These environment variables apply to 'all' core Git commands. Nb: it
 822is worth noting that they may be used/overridden by SCMS sitting above
 823Git so take care if using a foreign front-end.
 824
 825'GIT_INDEX_FILE'::
 826        This environment allows the specification of an alternate
 827        index file. If not specified, the default of `$GIT_DIR/index`
 828        is used.
 829
 830'GIT_INDEX_VERSION'::
 831        This environment variable allows the specification of an index
 832        version for new repositories.  It won't affect existing index
 833        files.  By default index file version 2 or 3 is used. See
 834        linkgit:git-update-index[1] for more information.
 835
 836'GIT_OBJECT_DIRECTORY'::
 837        If the object storage directory is specified via this
 838        environment variable then the sha1 directories are created
 839        underneath - otherwise the default `$GIT_DIR/objects`
 840        directory is used.
 841
 842'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 843        Due to the immutable nature of Git objects, old objects can be
 844        archived into shared, read-only directories. This variable
 845        specifies a ":" separated (on Windows ";" separated) list
 846        of Git object directories which can be used to search for Git
 847        objects. New objects will not be written to these directories.
 848
 849'GIT_DIR'::
 850        If the 'GIT_DIR' environment variable is set then it
 851        specifies a path to use instead of the default `.git`
 852        for the base of the repository.
 853        The '--git-dir' command-line option also sets this value.
 854
 855'GIT_WORK_TREE'::
 856        Set the path to the root of the working tree.
 857        This can also be controlled by the '--work-tree' command-line
 858        option and the core.worktree configuration variable.
 859
 860'GIT_NAMESPACE'::
 861        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 862        The '--namespace' command-line option also sets this value.
 863
 864'GIT_CEILING_DIRECTORIES'::
 865        This should be a colon-separated list of absolute paths.  If
 866        set, it is a list of directories that Git should not chdir up
 867        into while looking for a repository directory (useful for
 868        excluding slow-loading network directories).  It will not
 869        exclude the current working directory or a GIT_DIR set on the
 870        command line or in the environment.  Normally, Git has to read
 871        the entries in this list and resolve any symlink that
 872        might be present in order to compare them with the current
 873        directory.  However, if even this access is slow, you
 874        can add an empty entry to the list to tell Git that the
 875        subsequent entries are not symlinks and needn't be resolved;
 876        e.g.,
 877        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 878
 879'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 880        When run in a directory that does not have ".git" repository
 881        directory, Git tries to find such a directory in the parent
 882        directories to find the top of the working tree, but by default it
 883        does not cross filesystem boundaries.  This environment variable
 884        can be set to true to tell Git not to stop at filesystem
 885        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 886        an explicit repository directory set via 'GIT_DIR' or on the
 887        command line.
 888
 889'GIT_COMMON_DIR'::
 890        If this variable is set to a path, non-worktree files that are
 891        normally in $GIT_DIR will be taken from this path
 892        instead. Worktree-specific files such as HEAD or index are
 893        taken from $GIT_DIR. See linkgit:gitrepository-layout[5] and
 894        linkgit:git-worktree[1] for
 895        details. This variable has lower precedence than other path
 896        variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 897
 898Git Commits
 899~~~~~~~~~~~
 900'GIT_AUTHOR_NAME'::
 901'GIT_AUTHOR_EMAIL'::
 902'GIT_AUTHOR_DATE'::
 903'GIT_COMMITTER_NAME'::
 904'GIT_COMMITTER_EMAIL'::
 905'GIT_COMMITTER_DATE'::
 906'EMAIL'::
 907        see linkgit:git-commit-tree[1]
 908
 909Git Diffs
 910~~~~~~~~~
 911'GIT_DIFF_OPTS'::
 912        Only valid setting is "--unified=??" or "-u??" to set the
 913        number of context lines shown when a unified diff is created.
 914        This takes precedence over any "-U" or "--unified" option
 915        value passed on the Git diff command line.
 916
 917'GIT_EXTERNAL_DIFF'::
 918        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 919        program named by it is called, instead of the diff invocation
 920        described above.  For a path that is added, removed, or modified,
 921        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 922
 923        path old-file old-hex old-mode new-file new-hex new-mode
 924+
 925where:
 926
 927        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 928                         contents of <old|new>,
 929        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 930        <old|new>-mode:: are the octal representation of the file modes.
 931+
 932The file parameters can point at the user's working file
 933(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 934when a new file is added), or a temporary file (e.g. `old-file` in the
 935index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 936temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 937+
 938For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 939parameter, <path>.
 940+
 941For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 942'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 943
 944'GIT_DIFF_PATH_COUNTER'::
 945        A 1-based counter incremented by one for every path.
 946
 947'GIT_DIFF_PATH_TOTAL'::
 948        The total number of paths.
 949
 950other
 951~~~~~
 952'GIT_MERGE_VERBOSITY'::
 953        A number controlling the amount of output shown by
 954        the recursive merge strategy.  Overrides merge.verbosity.
 955        See linkgit:git-merge[1]
 956
 957'GIT_PAGER'::
 958        This environment variable overrides `$PAGER`. If it is set
 959        to an empty string or to the value "cat", Git will not launch
 960        a pager.  See also the `core.pager` option in
 961        linkgit:git-config[1].
 962
 963'GIT_EDITOR'::
 964        This environment variable overrides `$EDITOR` and `$VISUAL`.
 965        It is used by several Git commands when, on interactive mode,
 966        an editor is to be launched. See also linkgit:git-var[1]
 967        and the `core.editor` option in linkgit:git-config[1].
 968
 969'GIT_SSH'::
 970'GIT_SSH_COMMAND'::
 971        If either of these environment variables is set then 'git fetch'
 972        and 'git push' will use the specified command instead of 'ssh'
 973        when they need to connect to a remote system.
 974        The command will be given exactly two or four arguments: the
 975        'username@host' (or just 'host') from the URL and the shell
 976        command to execute on that remote system, optionally preceded by
 977        '-p' (literally) and the 'port' from the URL when it specifies
 978        something other than the default SSH port.
 979+
 980`$GIT_SSH_COMMAND` takes precedence over `$GIT_SSH`, and is interpreted
 981by the shell, which allows additional arguments to be included.
 982`$GIT_SSH` on the other hand must be just the path to a program
 983(which can be a wrapper shell script, if additional arguments are
 984needed).
 985+
 986Usually it is easier to configure any desired options through your
 987personal `.ssh/config` file.  Please consult your ssh documentation
 988for further details.
 989
 990'GIT_ASKPASS'::
 991        If this environment variable is set, then Git commands which need to
 992        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 993        will call this program with a suitable prompt as command-line argument
 994        and read the password from its STDOUT. See also the 'core.askPass'
 995        option in linkgit:git-config[1].
 996
 997'GIT_TERMINAL_PROMPT'::
 998        If this environment variable is set to `0`, git will not prompt
 999        on the terminal (e.g., when asking for HTTP authentication).
1000
1001'GIT_CONFIG_NOSYSTEM'::
1002        Whether to skip reading settings from the system-wide
1003        `$(prefix)/etc/gitconfig` file.  This environment variable can
1004        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
1005        predictable environment for a picky script, or you can set it
1006        temporarily to avoid using a buggy `/etc/gitconfig` file while
1007        waiting for someone with sufficient permissions to fix it.
1008
1009'GIT_FLUSH'::
1010        If this environment variable is set to "1", then commands such
1011        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
1012        'git check-attr' and 'git check-ignore' will
1013        force a flush of the output stream after each record have been
1014        flushed. If this
1015        variable is set to "0", the output of these commands will be done
1016        using completely buffered I/O.   If this environment variable is
1017        not set, Git will choose buffered or record-oriented flushing
1018        based on whether stdout appears to be redirected to a file or not.
1019
1020'GIT_TRACE'::
1021        Enables general trace messages, e.g. alias expansion, built-in
1022        command execution and external command execution.
1023+
1024If this variable is set to "1", "2" or "true" (comparison
1025is case insensitive), trace messages will be printed to
1026stderr.
1027+
1028If the variable is set to an integer value greater than 2
1029and lower than 10 (strictly) then Git will interpret this
1030value as an open file descriptor and will try to write the
1031trace messages into this file descriptor.
1032+
1033Alternatively, if the variable is set to an absolute path
1034(starting with a '/' character), Git will interpret this
1035as a file path and will try to write the trace messages
1036into it.
1037+
1038Unsetting the variable, or setting it to empty, "0" or
1039"false" (case insensitive) disables trace messages.
1040
1041'GIT_TRACE_PACK_ACCESS'::
1042        Enables trace messages for all accesses to any packs. For each
1043        access, the pack file name and an offset in the pack is
1044        recorded. This may be helpful for troubleshooting some
1045        pack-related performance problems.
1046        See 'GIT_TRACE' for available trace output options.
1047
1048'GIT_TRACE_PACKET'::
1049        Enables trace messages for all packets coming in or out of a
1050        given program. This can help with debugging object negotiation
1051        or other protocol issues. Tracing is turned off at a packet
1052        starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
1053        See 'GIT_TRACE' for available trace output options.
1054
1055'GIT_TRACE_PACKFILE'::
1056        Enables tracing of packfiles sent or received by a
1057        given program. Unlike other trace output, this trace is
1058        verbatim: no headers, and no quoting of binary data. You almost
1059        certainly want to direct into a file (e.g.,
1060        `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
1061        the terminal or mixing it with other trace output.
1062+
1063Note that this is currently only implemented for the client side
1064of clones and fetches.
1065
1066'GIT_TRACE_PERFORMANCE'::
1067        Enables performance related trace messages, e.g. total execution
1068        time of each Git command.
1069        See 'GIT_TRACE' for available trace output options.
1070
1071'GIT_TRACE_SETUP'::
1072        Enables trace messages printing the .git, working tree and current
1073        working directory after Git has completed its setup phase.
1074        See 'GIT_TRACE' for available trace output options.
1075
1076'GIT_TRACE_SHALLOW'::
1077        Enables trace messages that can help debugging fetching /
1078        cloning of shallow repositories.
1079        See 'GIT_TRACE' for available trace output options.
1080
1081'GIT_LITERAL_PATHSPECS'::
1082        Setting this variable to `1` will cause Git to treat all
1083        pathspecs literally, rather than as glob patterns. For example,
1084        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
1085        for commits that touch the path `*.c`, not any paths that the
1086        glob `*.c` matches. You might want this if you are feeding
1087        literal paths to Git (e.g., paths previously given to you by
1088        `git ls-tree`, `--raw` diff output, etc).
1089
1090'GIT_GLOB_PATHSPECS'::
1091        Setting this variable to `1` will cause Git to treat all
1092        pathspecs as glob patterns (aka "glob" magic).
1093
1094'GIT_NOGLOB_PATHSPECS'::
1095        Setting this variable to `1` will cause Git to treat all
1096        pathspecs as literal (aka "literal" magic).
1097
1098'GIT_ICASE_PATHSPECS'::
1099        Setting this variable to `1` will cause Git to treat all
1100        pathspecs as case-insensitive.
1101
1102'GIT_REFLOG_ACTION'::
1103        When a ref is updated, reflog entries are created to keep
1104        track of the reason why the ref was updated (which is
1105        typically the name of the high-level command that updated
1106        the ref), in addition to the old and new values of the ref.
1107        A scripted Porcelain command can use set_reflog_action
1108        helper function in `git-sh-setup` to set its name to this
1109        variable when it is invoked as the top level command by the
1110        end user, to be recorded in the body of the reflog.
1111
1112'GIT_REF_PARANOIA'::
1113        If set to `1`, include broken or badly named refs when iterating
1114        over lists of refs. In a normal, non-corrupted repository, this
1115        does nothing. However, enabling it may help git to detect and
1116        abort some operations in the presence of broken refs. Git sets
1117        this variable automatically when performing destructive
1118        operations like linkgit:git-prune[1]. You should not need to set
1119        it yourself unless you want to be paranoid about making sure
1120        an operation has touched every ref (e.g., because you are
1121        cloning a repository to make a backup).
1122
1123'GIT_ALLOW_PROTOCOL'::
1124        If set, provide a colon-separated list of protocols which are
1125        allowed to be used with fetch/push/clone. This is useful to
1126        restrict recursive submodule initialization from an untrusted
1127        repository. Any protocol not mentioned will be disallowed (i.e.,
1128        this is a whitelist, not a blacklist). If the variable is not
1129        set at all, all protocols are enabled.  The protocol names
1130        currently used by git are:
1131
1132          - `file`: any local file-based path (including `file://` URLs,
1133            or local paths)
1134
1135          - `git`: the anonymous git protocol over a direct TCP
1136            connection (or proxy, if configured)
1137
1138          - `ssh`: git over ssh (including `host:path` syntax,
1139            `ssh://`, etc).
1140
1141          - `http`: git over http, both "smart http" and "dumb http".
1142            Note that this does _not_ include `https`; if you want both,
1143            you should specify both as `http:https`.
1144
1145          - any external helpers are named by their protocol (e.g., use
1146            `hg` to allow the `git-remote-hg` helper)
1147
1148
1149Discussion[[Discussion]]
1150------------------------
1151
1152More detail on the following is available from the
1153link:user-manual.html#git-concepts[Git concepts chapter of the
1154user-manual] and linkgit:gitcore-tutorial[7].
1155
1156A Git project normally consists of a working directory with a ".git"
1157subdirectory at the top level.  The .git directory contains, among other
1158things, a compressed object database representing the complete history
1159of the project, an "index" file which links that history to the current
1160contents of the working tree, and named pointers into that history such
1161as tags and branch heads.
1162
1163The object database contains objects of three main types: blobs, which
1164hold file data; trees, which point to blobs and other trees to build up
1165directory hierarchies; and commits, which each reference a single tree
1166and some number of parent commits.
1167
1168The commit, equivalent to what other systems call a "changeset" or
1169"version", represents a step in the project's history, and each parent
1170represents an immediately preceding step.  Commits with more than one
1171parent represent merges of independent lines of development.
1172
1173All objects are named by the SHA-1 hash of their contents, normally
1174written as a string of 40 hex digits.  Such names are globally unique.
1175The entire history leading up to a commit can be vouched for by signing
1176just that commit.  A fourth object type, the tag, is provided for this
1177purpose.
1178
1179When first created, objects are stored in individual files, but for
1180efficiency may later be compressed together into "pack files".
1181
1182Named pointers called refs mark interesting points in history.  A ref
1183may contain the SHA-1 name of an object or the name of another ref.  Refs
1184with names beginning `ref/head/` contain the SHA-1 name of the most
1185recent commit (or "head") of a branch under development.  SHA-1 names of
1186tags of interest are stored under `ref/tags/`.  A special ref named
1187`HEAD` contains the name of the currently checked-out branch.
1188
1189The index file is initialized with a list of all paths and, for each
1190path, a blob object and a set of attributes.  The blob object represents
1191the contents of the file as of the head of the current branch.  The
1192attributes (last modified time, size, etc.) are taken from the
1193corresponding file in the working tree.  Subsequent changes to the
1194working tree can be found by comparing these attributes.  The index may
1195be updated with new content, and new commits may be created from the
1196content stored in the index.
1197
1198The index is also capable of storing multiple entries (called "stages")
1199for a given pathname.  These stages are used to hold the various
1200unmerged version of a file when a merge is in progress.
1201
1202FURTHER DOCUMENTATION
1203---------------------
1204
1205See the references in the "description" section to get started
1206using Git.  The following is probably more detail than necessary
1207for a first-time user.
1208
1209The link:user-manual.html#git-concepts[Git concepts chapter of the
1210user-manual] and linkgit:gitcore-tutorial[7] both provide
1211introductions to the underlying Git architecture.
1212
1213See linkgit:gitworkflows[7] for an overview of recommended workflows.
1214
1215See also the link:howto-index.html[howto] documents for some useful
1216examples.
1217
1218The internals are documented in the
1219link:technical/api-index.html[Git API documentation].
1220
1221Users migrating from CVS may also want to
1222read linkgit:gitcvs-migration[7].
1223
1224
1225Authors
1226-------
1227Git was started by Linus Torvalds, and is currently maintained by Junio
1228C Hamano. Numerous contributions have come from the Git mailing list
1229<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1230gives you a more complete list of contributors.
1231
1232If you have a clone of git.git itself, the
1233output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1234the authors for specific parts of the project.
1235
1236Reporting Bugs
1237--------------
1238
1239Report bugs to the Git mailing list <git@vger.kernel.org> where the
1240development and maintenance is primarily done.  You do not have to be
1241subscribed to the list to send a message there.
1242
1243SEE ALSO
1244--------
1245linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1246linkgit:giteveryday[7], linkgit:gitcvs-migration[7],
1247linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1248linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1249linkgit:gitworkflows[7]
1250
1251GIT
1252---
1253Part of the linkgit:git[1] suite