1 git(1)
2 ======
4 NAME
5 ----
6 git - the stupid content tracker
9 SYNOPSIS
10 --------
11 [verse]
12 'git' [--version] [--exec-path[=<path>]] [--html-path]
13 [-p|--paginate|--no-pager] [--no-replace-objects]
14 [--bare] [--git-dir=<path>] [--work-tree=<path>]
15 [-c <name>=<value>]
16 [--help] <command> [<args>]
18 DESCRIPTION
19 -----------
20 Git is a fast, scalable, distributed revision control system with an
21 unusually rich command set that provides both high-level operations
22 and full access to internals.
24 See linkgit:gittutorial[7] to get started, then see
25 link:everyday.html[Everyday Git] for a useful minimum set of commands, and
26 "man git-commandname" for documentation of each command. CVS users may
27 also want to read linkgit:gitcvs-migration[7]. See
28 the link:user-manual.html[Git User's Manual] for a more in-depth
29 introduction.
31 The '<command>' is either a name of a Git command (see below) or an alias
32 as defined in the configuration file (see linkgit:git-config[1]).
34 Formatted and hyperlinked version of the latest git
35 documentation can be viewed at
36 `http://www.kernel.org/pub/software/scm/git/docs/`.
38 ifdef::stalenotes[]
39 [NOTE]
40 ============
42 You are reading the documentation for the latest (possibly
43 unreleased) version of git, that is available from 'master'
44 branch of the `git.git` repository.
45 Documentation for older releases are available here:
47 * link:v1.7.4.4/git.html[documentation for release 1.7.4.4]
49 * release notes for
50 link:RelNotes/1.7.4.4.txt[1.7.4.4],
51 link:RelNotes/1.7.4.3.txt[1.7.4.3],
52 link:RelNotes/1.7.4.2.txt[1.7.4.2],
53 link:RelNotes/1.7.4.1.txt[1.7.4.1],
54 link:RelNotes/1.7.4.txt[1.7.4].
56 * link:v1.7.3.5/git.html[documentation for release 1.7.3.5]
58 * release notes for
59 link:RelNotes/1.7.3.5.txt[1.7.3.5],
60 link:RelNotes/1.7.3.4.txt[1.7.3.4],
61 link:RelNotes/1.7.3.3.txt[1.7.3.3],
62 link:RelNotes/1.7.3.2.txt[1.7.3.2],
63 link:RelNotes/1.7.3.1.txt[1.7.3.1],
64 link:RelNotes/1.7.3.txt[1.7.3].
66 * link:v1.7.2.5/git.html[documentation for release 1.7.2.5]
68 * release notes for
69 link:RelNotes/1.7.2.5.txt[1.7.2.5],
70 link:RelNotes/1.7.2.4.txt[1.7.2.4],
71 link:RelNotes/1.7.2.3.txt[1.7.2.3],
72 link:RelNotes/1.7.2.2.txt[1.7.2.2],
73 link:RelNotes/1.7.2.1.txt[1.7.2.1],
74 link:RelNotes/1.7.2.txt[1.7.2].
76 * link:v1.7.1.4/git.html[documentation for release 1.7.1.4]
78 * release notes for
79 link:RelNotes/1.7.1.4.txt[1.7.1.4],
80 link:RelNotes/1.7.1.3.txt[1.7.1.3],
81 link:RelNotes/1.7.1.2.txt[1.7.1.2],
82 link:RelNotes/1.7.1.1.txt[1.7.1.1],
83 link:RelNotes/1.7.1.txt[1.7.1].
85 * link:v1.7.0.9/git.html[documentation for release 1.7.0.9]
87 * release notes for
88 link:RelNotes/1.7.0.9.txt[1.7.0.9],
89 link:RelNotes/1.7.0.8.txt[1.7.0.8],
90 link:RelNotes/1.7.0.7.txt[1.7.0.7],
91 link:RelNotes/1.7.0.6.txt[1.7.0.6],
92 link:RelNotes/1.7.0.5.txt[1.7.0.5],
93 link:RelNotes/1.7.0.4.txt[1.7.0.4],
94 link:RelNotes/1.7.0.3.txt[1.7.0.3],
95 link:RelNotes/1.7.0.2.txt[1.7.0.2],
96 link:RelNotes/1.7.0.1.txt[1.7.0.1],
97 link:RelNotes/1.7.0.txt[1.7.0].
99 * link:v1.6.6.3/git.html[documentation for release 1.6.6.3]
101 * release notes for
102 link:RelNotes/1.6.6.3.txt[1.6.6.3],
103 link:RelNotes/1.6.6.2.txt[1.6.6.2],
104 link:RelNotes/1.6.6.1.txt[1.6.6.1],
105 link:RelNotes/1.6.6.txt[1.6.6].
107 * link:v1.6.5.9/git.html[documentation for release 1.6.5.9]
109 * release notes for
110 link:RelNotes/1.6.5.9.txt[1.6.5.9],
111 link:RelNotes/1.6.5.8.txt[1.6.5.8],
112 link:RelNotes/1.6.5.7.txt[1.6.5.7],
113 link:RelNotes/1.6.5.6.txt[1.6.5.6],
114 link:RelNotes/1.6.5.5.txt[1.6.5.5],
115 link:RelNotes/1.6.5.4.txt[1.6.5.4],
116 link:RelNotes/1.6.5.3.txt[1.6.5.3],
117 link:RelNotes/1.6.5.2.txt[1.6.5.2],
118 link:RelNotes/1.6.5.1.txt[1.6.5.1],
119 link:RelNotes/1.6.5.txt[1.6.5].
121 * link:v1.6.4.5/git.html[documentation for release 1.6.4.5]
123 * release notes for
124 link:RelNotes/1.6.4.5.txt[1.6.4.5],
125 link:RelNotes/1.6.4.4.txt[1.6.4.4],
126 link:RelNotes/1.6.4.3.txt[1.6.4.3],
127 link:RelNotes/1.6.4.2.txt[1.6.4.2],
128 link:RelNotes/1.6.4.1.txt[1.6.4.1],
129 link:RelNotes/1.6.4.txt[1.6.4].
131 * link:v1.6.3.4/git.html[documentation for release 1.6.3.4]
133 * release notes for
134 link:RelNotes/1.6.3.4.txt[1.6.3.4],
135 link:RelNotes/1.6.3.3.txt[1.6.3.3],
136 link:RelNotes/1.6.3.2.txt[1.6.3.2],
137 link:RelNotes/1.6.3.1.txt[1.6.3.1],
138 link:RelNotes/1.6.3.txt[1.6.3].
140 * release notes for
141 link:RelNotes/1.6.2.5.txt[1.6.2.5],
142 link:RelNotes/1.6.2.4.txt[1.6.2.4],
143 link:RelNotes/1.6.2.3.txt[1.6.2.3],
144 link:RelNotes/1.6.2.2.txt[1.6.2.2],
145 link:RelNotes/1.6.2.1.txt[1.6.2.1],
146 link:RelNotes/1.6.2.txt[1.6.2].
148 * link:v1.6.1.3/git.html[documentation for release 1.6.1.3]
150 * release notes for
151 link:RelNotes/1.6.1.3.txt[1.6.1.3],
152 link:RelNotes/1.6.1.2.txt[1.6.1.2],
153 link:RelNotes/1.6.1.1.txt[1.6.1.1],
154 link:RelNotes/1.6.1.txt[1.6.1].
156 * link:v1.6.0.6/git.html[documentation for release 1.6.0.6]
158 * release notes for
159 link:RelNotes/1.6.0.6.txt[1.6.0.6],
160 link:RelNotes/1.6.0.5.txt[1.6.0.5],
161 link:RelNotes/1.6.0.4.txt[1.6.0.4],
162 link:RelNotes/1.6.0.3.txt[1.6.0.3],
163 link:RelNotes/1.6.0.2.txt[1.6.0.2],
164 link:RelNotes/1.6.0.1.txt[1.6.0.1],
165 link:RelNotes/1.6.0.txt[1.6.0].
167 * link:v1.5.6.6/git.html[documentation for release 1.5.6.6]
169 * release notes for
170 link:RelNotes/1.5.6.6.txt[1.5.6.6],
171 link:RelNotes/1.5.6.5.txt[1.5.6.5],
172 link:RelNotes/1.5.6.4.txt[1.5.6.4],
173 link:RelNotes/1.5.6.3.txt[1.5.6.3],
174 link:RelNotes/1.5.6.2.txt[1.5.6.2],
175 link:RelNotes/1.5.6.1.txt[1.5.6.1],
176 link:RelNotes/1.5.6.txt[1.5.6].
178 * link:v1.5.5.6/git.html[documentation for release 1.5.5.6]
180 * release notes for
181 link:RelNotes/1.5.5.6.txt[1.5.5.6],
182 link:RelNotes/1.5.5.5.txt[1.5.5.5],
183 link:RelNotes/1.5.5.4.txt[1.5.5.4],
184 link:RelNotes/1.5.5.3.txt[1.5.5.3],
185 link:RelNotes/1.5.5.2.txt[1.5.5.2],
186 link:RelNotes/1.5.5.1.txt[1.5.5.1],
187 link:RelNotes/1.5.5.txt[1.5.5].
189 * link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
191 * release notes for
192 link:RelNotes/1.5.4.7.txt[1.5.4.7],
193 link:RelNotes/1.5.4.6.txt[1.5.4.6],
194 link:RelNotes/1.5.4.5.txt[1.5.4.5],
195 link:RelNotes/1.5.4.4.txt[1.5.4.4],
196 link:RelNotes/1.5.4.3.txt[1.5.4.3],
197 link:RelNotes/1.5.4.2.txt[1.5.4.2],
198 link:RelNotes/1.5.4.1.txt[1.5.4.1],
199 link:RelNotes/1.5.4.txt[1.5.4].
201 * link:v1.5.3.8/git.html[documentation for release 1.5.3.8]
203 * release notes for
204 link:RelNotes/1.5.3.8.txt[1.5.3.8],
205 link:RelNotes/1.5.3.7.txt[1.5.3.7],
206 link:RelNotes/1.5.3.6.txt[1.5.3.6],
207 link:RelNotes/1.5.3.5.txt[1.5.3.5],
208 link:RelNotes/1.5.3.4.txt[1.5.3.4],
209 link:RelNotes/1.5.3.3.txt[1.5.3.3],
210 link:RelNotes/1.5.3.2.txt[1.5.3.2],
211 link:RelNotes/1.5.3.1.txt[1.5.3.1],
212 link:RelNotes/1.5.3.txt[1.5.3].
214 * link:v1.5.2.5/git.html[documentation for release 1.5.2.5]
216 * release notes for
217 link:RelNotes/1.5.2.5.txt[1.5.2.5],
218 link:RelNotes/1.5.2.4.txt[1.5.2.4],
219 link:RelNotes/1.5.2.3.txt[1.5.2.3],
220 link:RelNotes/1.5.2.2.txt[1.5.2.2],
221 link:RelNotes/1.5.2.1.txt[1.5.2.1],
222 link:RelNotes/1.5.2.txt[1.5.2].
224 * link:v1.5.1.6/git.html[documentation for release 1.5.1.6]
226 * release notes for
227 link:RelNotes/1.5.1.6.txt[1.5.1.6],
228 link:RelNotes/1.5.1.5.txt[1.5.1.5],
229 link:RelNotes/1.5.1.4.txt[1.5.1.4],
230 link:RelNotes/1.5.1.3.txt[1.5.1.3],
231 link:RelNotes/1.5.1.2.txt[1.5.1.2],
232 link:RelNotes/1.5.1.1.txt[1.5.1.1],
233 link:RelNotes/1.5.1.txt[1.5.1].
235 * link:v1.5.0.7/git.html[documentation for release 1.5.0.7]
237 * release notes for
238 link:RelNotes/1.5.0.7.txt[1.5.0.7],
239 link:RelNotes/1.5.0.6.txt[1.5.0.6],
240 link:RelNotes/1.5.0.5.txt[1.5.0.5],
241 link:RelNotes/1.5.0.3.txt[1.5.0.3],
242 link:RelNotes/1.5.0.2.txt[1.5.0.2],
243 link:RelNotes/1.5.0.1.txt[1.5.0.1],
244 link:RelNotes/1.5.0.txt[1.5.0].
246 * documentation for release link:v1.4.4.4/git.html[1.4.4.4],
247 link:v1.3.3/git.html[1.3.3],
248 link:v1.2.6/git.html[1.2.6],
249 link:v1.0.13/git.html[1.0.13].
251 ============
253 endif::stalenotes[]
255 OPTIONS
256 -------
257 --version::
258 Prints the git suite version that the 'git' program came from.
260 --help::
261 Prints the synopsis and a list of the most commonly used
262 commands. If the option '--all' or '-a' is given then all
263 available commands are printed. If a git command is named this
264 option will bring up the manual page for that command.
265 +
266 Other options are available to control how the manual page is
267 displayed. See linkgit:git-help[1] for more information,
268 because `git --help ...` is converted internally into `git
269 help ...`.
271 -c <name>=<value>::
272 Pass a configuration parameter to the command. The value
273 given will override values from configuration files.
274 The <name> is expected in the same format as listed by
275 'git config' (subkeys separated by dots).
277 --exec-path[=<path>]::
278 Path to wherever your core git programs are installed.
279 This can also be controlled by setting the GIT_EXEC_PATH
280 environment variable. If no path is given, 'git' will print
281 the current setting and then exit.
283 --html-path::
284 Print the path to wherever your git HTML documentation is installed
285 and exit.
287 -p::
288 --paginate::
289 Pipe all output into 'less' (or if set, $PAGER) if standard
290 output is a terminal. This overrides the `pager.<cmd>`
291 configuration options (see the "Configuration Mechanism" section
292 below).
294 --no-pager::
295 Do not pipe git output into a pager.
297 --git-dir=<path>::
298 Set the path to the repository. This can also be controlled by
299 setting the GIT_DIR environment variable. It can be an absolute
300 path or relative path to current working directory.
302 --work-tree=<path>::
303 Set the path to the working tree. It can be an absolute path
304 or a path relative to the current working directory.
305 This can also be controlled by setting the GIT_WORK_TREE
306 environment variable and the core.worktree configuration
307 variable (see core.worktree in linkgit:git-config[1] for a
308 more detailed discussion).
310 --bare::
311 Treat the repository as a bare repository. If GIT_DIR
312 environment is not set, it is set to the current working
313 directory.
315 --no-replace-objects::
316 Do not use replacement refs to replace git objects. See
317 linkgit:git-replace[1] for more information.
320 FURTHER DOCUMENTATION
321 ---------------------
323 See the references above to get started using git. The following is
324 probably more detail than necessary for a first-time user.
326 The link:user-manual.html#git-concepts[git concepts chapter of the
327 user-manual] and linkgit:gitcore-tutorial[7] both provide
328 introductions to the underlying git architecture.
330 See linkgit:gitworkflows[7] for an overview of recommended workflows.
332 See also the link:howto-index.html[howto] documents for some useful
333 examples.
335 The internals are documented in the
336 link:technical/api-index.html[GIT API documentation].
338 GIT COMMANDS
339 ------------
341 We divide git into high level ("porcelain") commands and low level
342 ("plumbing") commands.
344 High-level commands (porcelain)
345 -------------------------------
347 We separate the porcelain commands into the main commands and some
348 ancillary user utilities.
350 Main porcelain commands
351 ~~~~~~~~~~~~~~~~~~~~~~~
353 include::cmds-mainporcelain.txt[]
355 Ancillary Commands
356 ~~~~~~~~~~~~~~~~~~
357 Manipulators:
359 include::cmds-ancillarymanipulators.txt[]
361 Interrogators:
363 include::cmds-ancillaryinterrogators.txt[]
366 Interacting with Others
367 ~~~~~~~~~~~~~~~~~~~~~~~
369 These commands are to interact with foreign SCM and with other
370 people via patch over e-mail.
372 include::cmds-foreignscminterface.txt[]
375 Low-level commands (plumbing)
376 -----------------------------
378 Although git includes its
379 own porcelain layer, its low-level commands are sufficient to support
380 development of alternative porcelains. Developers of such porcelains
381 might start by reading about linkgit:git-update-index[1] and
382 linkgit:git-read-tree[1].
384 The interface (input, output, set of options and the semantics)
385 to these low-level commands are meant to be a lot more stable
386 than Porcelain level commands, because these commands are
387 primarily for scripted use. The interface to Porcelain commands
388 on the other hand are subject to change in order to improve the
389 end user experience.
391 The following description divides
392 the low-level commands into commands that manipulate objects (in
393 the repository, index, and working tree), commands that interrogate and
394 compare objects, and commands that move objects and references between
395 repositories.
398 Manipulation commands
399 ~~~~~~~~~~~~~~~~~~~~~
401 include::cmds-plumbingmanipulators.txt[]
404 Interrogation commands
405 ~~~~~~~~~~~~~~~~~~~~~~
407 include::cmds-plumbinginterrogators.txt[]
409 In general, the interrogate commands do not touch the files in
410 the working tree.
413 Synching repositories
414 ~~~~~~~~~~~~~~~~~~~~~
416 include::cmds-synchingrepositories.txt[]
418 The following are helper commands used by the above; end users
419 typically do not use them directly.
421 include::cmds-synchelpers.txt[]
424 Internal helper commands
425 ~~~~~~~~~~~~~~~~~~~~~~~~
427 These are internal helper commands used by other commands; end
428 users typically do not use them directly.
430 include::cmds-purehelpers.txt[]
433 Configuration Mechanism
434 -----------------------
436 Starting from 0.99.9 (actually mid 0.99.8.GIT), `.git/config` file
437 is used to hold per-repository configuration options. It is a
438 simple text file modeled after `.ini` format familiar to some
439 people. Here is an example:
441 ------------
442 #
443 # A '#' or ';' character indicates a comment.
444 #
446 ; core variables
447 [core]
448 ; Don't trust file modes
449 filemode = false
451 ; user identity
452 [user]
453 name = "Junio C Hamano"
454 email = "junkio@twinsun.com"
456 ------------
458 Various commands read from the configuration file and adjust
459 their operation accordingly. See linkgit:git-config[1] for a
460 list.
463 Identifier Terminology
464 ----------------------
465 <object>::
466 Indicates the object name for any type of object.
468 <blob>::
469 Indicates a blob object name.
471 <tree>::
472 Indicates a tree object name.
474 <commit>::
475 Indicates a commit object name.
477 <tree-ish>::
478 Indicates a tree, commit or tag object name. A
479 command that takes a <tree-ish> argument ultimately wants to
480 operate on a <tree> object but automatically dereferences
481 <commit> and <tag> objects that point at a <tree>.
483 <commit-ish>::
484 Indicates a commit or tag object name. A
485 command that takes a <commit-ish> argument ultimately wants to
486 operate on a <commit> object but automatically dereferences
487 <tag> objects that point at a <commit>.
489 <type>::
490 Indicates that an object type is required.
491 Currently one of: `blob`, `tree`, `commit`, or `tag`.
493 <file>::
494 Indicates a filename - almost always relative to the
495 root of the tree structure `GIT_INDEX_FILE` describes.
497 Symbolic Identifiers
498 --------------------
499 Any git command accepting any <object> can also use the following
500 symbolic notation:
502 HEAD::
503 indicates the head of the current branch (i.e. the
504 contents of `$GIT_DIR/HEAD`).
506 <tag>::
507 a valid tag 'name'
508 (i.e. the contents of `$GIT_DIR/refs/tags/<tag>`).
510 <head>::
511 a valid head 'name'
512 (i.e. the contents of `$GIT_DIR/refs/heads/<head>`).
514 For a more complete list of ways to spell object names, see
515 "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
518 File/Directory Structure
519 ------------------------
521 Please see the linkgit:gitrepository-layout[5] document.
523 Read linkgit:githooks[5] for more details about each hook.
525 Higher level SCMs may provide and manage additional information in the
526 `$GIT_DIR`.
529 Terminology
530 -----------
531 Please see linkgit:gitglossary[7].
534 Environment Variables
535 ---------------------
536 Various git commands use the following environment variables:
538 The git Repository
539 ~~~~~~~~~~~~~~~~~~
540 These environment variables apply to 'all' core git commands. Nb: it
541 is worth noting that they may be used/overridden by SCMS sitting above
542 git so take care if using Cogito etc.
544 'GIT_INDEX_FILE'::
545 This environment allows the specification of an alternate
546 index file. If not specified, the default of `$GIT_DIR/index`
547 is used.
549 'GIT_OBJECT_DIRECTORY'::
550 If the object storage directory is specified via this
551 environment variable then the sha1 directories are created
552 underneath - otherwise the default `$GIT_DIR/objects`
553 directory is used.
555 'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
556 Due to the immutable nature of git objects, old objects can be
557 archived into shared, read-only directories. This variable
558 specifies a ":" separated (on Windows ";" separated) list
559 of git object directories which can be used to search for git
560 objects. New objects will not be written to these directories.
562 'GIT_DIR'::
563 If the 'GIT_DIR' environment variable is set then it
564 specifies a path to use instead of the default `.git`
565 for the base of the repository.
567 'GIT_WORK_TREE'::
568 Set the path to the working tree. The value will not be
569 used in combination with repositories found automatically in
570 a .git directory (i.e. $GIT_DIR is not set).
571 This can also be controlled by the '--work-tree' command line
572 option and the core.worktree configuration variable.
574 'GIT_CEILING_DIRECTORIES'::
575 This should be a colon-separated list of absolute paths.
576 If set, it is a list of directories that git should not chdir
577 up into while looking for a repository directory.
578 It will not exclude the current working directory or
579 a GIT_DIR set on the command line or in the environment.
580 (Useful for excluding slow-loading network directories.)
582 'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
583 When run in a directory that does not have ".git" repository
584 directory, git tries to find such a directory in the parent
585 directories to find the top of the working tree, but by default it
586 does not cross filesystem boundaries. This environment variable
587 can be set to true to tell git not to stop at filesystem
588 boundaries. Like 'GIT_CEILING_DIRECTORIES', this will not affect
589 an explicit repository directory set via 'GIT_DIR' or on the
590 command line.
592 git Commits
593 ~~~~~~~~~~~
594 'GIT_AUTHOR_NAME'::
595 'GIT_AUTHOR_EMAIL'::
596 'GIT_AUTHOR_DATE'::
597 'GIT_COMMITTER_NAME'::
598 'GIT_COMMITTER_EMAIL'::
599 'GIT_COMMITTER_DATE'::
600 'EMAIL'::
601 see linkgit:git-commit-tree[1]
603 git Diffs
604 ~~~~~~~~~
605 'GIT_DIFF_OPTS'::
606 Only valid setting is "--unified=??" or "-u??" to set the
607 number of context lines shown when a unified diff is created.
608 This takes precedence over any "-U" or "--unified" option
609 value passed on the git diff command line.
611 'GIT_EXTERNAL_DIFF'::
612 When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
613 program named by it is called, instead of the diff invocation
614 described above. For a path that is added, removed, or modified,
615 'GIT_EXTERNAL_DIFF' is called with 7 parameters:
617 path old-file old-hex old-mode new-file new-hex new-mode
618 +
619 where:
621 <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
622 contents of <old|new>,
623 <old|new>-hex:: are the 40-hexdigit SHA1 hashes,
624 <old|new>-mode:: are the octal representation of the file modes.
625 +
626 The file parameters can point at the user's working file
627 (e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
628 when a new file is added), or a temporary file (e.g. `old-file` in the
629 index). 'GIT_EXTERNAL_DIFF' should not worry about unlinking the
630 temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
631 +
632 For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
633 parameter, <path>.
635 other
636 ~~~~~
637 'GIT_MERGE_VERBOSITY'::
638 A number controlling the amount of output shown by
639 the recursive merge strategy. Overrides merge.verbosity.
640 See linkgit:git-merge[1]
642 'GIT_PAGER'::
643 This environment variable overrides `$PAGER`. If it is set
644 to an empty string or to the value "cat", git will not launch
645 a pager. See also the `core.pager` option in
646 linkgit:git-config[1].
648 'GIT_SSH'::
649 If this environment variable is set then 'git fetch'
650 and 'git push' will use this command instead
651 of 'ssh' when they need to connect to a remote system.
652 The '$GIT_SSH' command will be given exactly two arguments:
653 the 'username@host' (or just 'host') from the URL and the
654 shell command to execute on that remote system.
655 +
656 To pass options to the program that you want to list in GIT_SSH
657 you will need to wrap the program and options into a shell script,
658 then set GIT_SSH to refer to the shell script.
659 +
660 Usually it is easier to configure any desired options through your
661 personal `.ssh/config` file. Please consult your ssh documentation
662 for further details.
664 'GIT_ASKPASS'::
665 If this environment variable is set, then git commands which need to
666 acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
667 will call this program with a suitable prompt as command line argument
668 and read the password from its STDOUT. See also the 'core.askpass'
669 option in linkgit:git-config[1].
671 'GIT_FLUSH'::
672 If this environment variable is set to "1", then commands such
673 as 'git blame' (in incremental mode), 'git rev-list', 'git log',
674 and 'git whatchanged' will force a flush of the output stream
675 after each commit-oriented record have been flushed. If this
676 variable is set to "0", the output of these commands will be done
677 using completely buffered I/O. If this environment variable is
678 not set, git will choose buffered or record-oriented flushing
679 based on whether stdout appears to be redirected to a file or not.
681 'GIT_TRACE'::
682 If this variable is set to "1", "2" or "true" (comparison
683 is case insensitive), git will print `trace:` messages on
684 stderr telling about alias expansion, built-in command
685 execution and external command execution.
686 If this variable is set to an integer value greater than 1
687 and lower than 10 (strictly) then git will interpret this
688 value as an open file descriptor and will try to write the
689 trace messages into this file descriptor.
690 Alternatively, if this variable is set to an absolute path
691 (starting with a '/' character), git will interpret this
692 as a file path and will try to write the trace messages
693 into it.
695 Discussion[[Discussion]]
696 ------------------------
698 More detail on the following is available from the
699 link:user-manual.html#git-concepts[git concepts chapter of the
700 user-manual] and linkgit:gitcore-tutorial[7].
702 A git project normally consists of a working directory with a ".git"
703 subdirectory at the top level. The .git directory contains, among other
704 things, a compressed object database representing the complete history
705 of the project, an "index" file which links that history to the current
706 contents of the working tree, and named pointers into that history such
707 as tags and branch heads.
709 The object database contains objects of three main types: blobs, which
710 hold file data; trees, which point to blobs and other trees to build up
711 directory hierarchies; and commits, which each reference a single tree
712 and some number of parent commits.
714 The commit, equivalent to what other systems call a "changeset" or
715 "version", represents a step in the project's history, and each parent
716 represents an immediately preceding step. Commits with more than one
717 parent represent merges of independent lines of development.
719 All objects are named by the SHA1 hash of their contents, normally
720 written as a string of 40 hex digits. Such names are globally unique.
721 The entire history leading up to a commit can be vouched for by signing
722 just that commit. A fourth object type, the tag, is provided for this
723 purpose.
725 When first created, objects are stored in individual files, but for
726 efficiency may later be compressed together into "pack files".
728 Named pointers called refs mark interesting points in history. A ref
729 may contain the SHA1 name of an object or the name of another ref. Refs
730 with names beginning `ref/head/` contain the SHA1 name of the most
731 recent commit (or "head") of a branch under development. SHA1 names of
732 tags of interest are stored under `ref/tags/`. A special ref named
733 `HEAD` contains the name of the currently checked-out branch.
735 The index file is initialized with a list of all paths and, for each
736 path, a blob object and a set of attributes. The blob object represents
737 the contents of the file as of the head of the current branch. The
738 attributes (last modified time, size, etc.) are taken from the
739 corresponding file in the working tree. Subsequent changes to the
740 working tree can be found by comparing these attributes. The index may
741 be updated with new content, and new commits may be created from the
742 content stored in the index.
744 The index is also capable of storing multiple entries (called "stages")
745 for a given pathname. These stages are used to hold the various
746 unmerged version of a file when a merge is in progress.
748 Authors
749 -------
750 Git was started by Linus Torvalds, and is currently maintained by Junio
751 C Hamano. Numerous contributions have come from the git mailing list
752 <git@vger.kernel.org>. For a more complete list of contributors, see
753 http://git-scm.com/about. If you have a clone of git.git itself, the
754 output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
755 the authors for specific parts of the project.
757 Reporting Bugs
758 --------------
760 Report bugs to the Git mailing list <git@vger.kernel.org> where the
761 development and maintenance is primarily done. You do not have to be
762 subscribed to the list to send a message there.
764 SEE ALSO
765 --------
766 linkgit:gittutorial[7], linkgit:gittutorial-2[7],
767 link:everyday.html[Everyday Git], linkgit:gitcvs-migration[7],
768 linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
769 linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
770 linkgit:gitworkflows[7]
772 GIT
773 ---
774 Part of the linkgit:git[1] suite