manpages: italicize command names
[git/git.git] / Documentation / git-describe.txt
CommitLineData
c06818e2
JH
1git-describe(1)
2===============
3
4NAME
5----
7bd7f280 6git-describe - Show the most recent tag that is reachable from a commit
c06818e2
JH
7
8
9SYNOPSIS
10--------
b1889c36 11'git describe' [--all] [--tags] [--contains] [--abbrev=<n>] <committish>...
c06818e2
JH
12
13DESCRIPTION
14-----------
15The command finds the most recent tag that is reachable from a
b7893cde
IH
16commit. If the tag points to the commit, then only the tag is
17shown. Otherwise, it suffixes the tag name with the number of
18additional commits on top of the tagged object and the
19abbreviated object name of the most recent commit.
c06818e2
JH
20
21
22OPTIONS
23-------
24<committish>::
37425065 25 The object name of the committish.
c06818e2
JH
26
27--all::
28 Instead of using only the annotated tags, use any ref
29 found in `.git/refs/`.
30
31--tags::
32 Instead of using only the annotated tags, use any tag
33 found in `.git/refs/tags`.
34
23615708
SP
35--contains::
36 Instead of finding the tag that predates the commit, find
37 the tag that comes after the commit, and thus contains it.
38 Automatically implies --tags.
39
c06818e2
JH
40--abbrev=<n>::
41 Instead of using the default 8 hexadecimal digits as the
42 abbreviated object name, use <n> digits.
43
8713ab30
SP
44--candidates=<n>::
45 Instead of considering only the 10 most recent tags as
46 candidates to describe the input committish consider
47 up to <n> candidates. Increasing <n> above 10 will take
48 slightly longer but may produce a more accurate result.
2c33f757
SP
49 An <n> of 0 will cause only exact matches to be output.
50
51--exact-match::
52 Only output exact matches (a tag directly references the
53 supplied commit). This is a synonym for --candidates=0.
8713ab30
SP
54
55--debug::
56 Verbosely display information about the searching strategy
57 being employed to standard error. The tag name will still
58 be printed to standard out.
c06818e2 59
518120e3
SB
60--long::
61 Always output the long format (the tag, the number of commits
62 and the abbreviated commit name) even when it matches a tag.
63 This is useful when you want to see parts of the commit object name
64 in "describe" output, even when the commit in question happens to be
65 a tagged version. Instead of just emitting the tag name, it will
66 describe such a commit as v1.2-0-deadbeef (0th commit since tag v1.2
67 that points at object deadbeef....).
68
30ffa603
PH
69--match <pattern>::
70 Only consider tags matching the given pattern (can be used to avoid
71 leaking private tags made from the repository).
72
a3800f66
SB
73--always::
74 Show uniquely abbreviated commit object as fallback.
75
c06818e2
JH
76EXAMPLES
77--------
78
79With something like git.git current tree, I get:
80
b1889c36 81 [torvalds@g5 git]$ git describe parent
1891261e 82 v1.0.4-14-g2414721
c06818e2
JH
83
84i.e. the current head of my "parent" branch is based on v1.0.4,
1891261e
JH
85but since it has a handful commits on top of that,
86describe has added the number of additional commits ("14") and
87an abbreviated object name for the commit itself ("2414721")
88at the end.
89
90The number of additional commits is the number
91of commits which would be displayed by "git log v1.0.4..parent".
92The hash suffix is "-g" + 7-char abbreviation for the tip commit
93of parent (which was `2414721b194453f058079d897d13c4e377f92dc6`).
c06818e2 94
483bc4f0 95Doing a `git-describe` on a tag-name will just show the tag name:
c06818e2 96
b1889c36 97 [torvalds@g5 git]$ git describe v1.0.4
c06818e2
JH
98 v1.0.4
99
100With --all, the command can use branch heads as references, so
101the output shows the reference path as well:
102
103 [torvalds@g5 git]$ git describe --all --abbrev=4 v1.0.5^2
1891261e 104 tags/v1.0.0-21-g975b
c06818e2
JH
105
106 [torvalds@g5 git]$ git describe --all HEAD^
1891261e
JH
107 heads/lt/describe-7-g975b
108
109With --abbrev set to 0, the command can be used to find the
110closest tagname without any suffix:
111
112 [torvalds@g5 git]$ git describe --abbrev=0 v1.0.5^2
113 tags/v1.0.0
c06818e2 114
8713ab30
SP
115SEARCH STRATEGY
116---------------
117
483bc4f0 118For each committish supplied, `git-describe` will first look for
8713ab30
SP
119a tag which tags exactly that commit. Annotated tags will always
120be preferred over lightweight tags, and tags with newer dates will
121always be preferred over tags with older dates. If an exact match
122is found, its name will be output and searching will stop.
123
483bc4f0 124If an exact match was not found, `git-describe` will walk back
8713ab30
SP
125through the commit history to locate an ancestor commit which
126has been tagged. The ancestor's tag will be output along with an
127abbreviation of the input committish's SHA1.
128
129If multiple tags were found during the walk then the tag which
130has the fewest commits different from the input committish will be
131selected and output. Here fewest commits different is defined as
483bc4f0 132the number of commits which would be shown by `git log tag..input`
8713ab30
SP
133will be the smallest number of commits possible.
134
c06818e2
JH
135
136Author
137------
138Written by Linus Torvalds <torvalds@osdl.org>, but somewhat
1891261e
JH
139butchered by Junio C Hamano <junkio@cox.net>. Later significantly
140updated by Shawn Pearce <spearce@spearce.org>.
c06818e2
JH
141
142Documentation
143--------------
144Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
145
146GIT
147---
9e1f0a85 148Part of the linkgit:git[1] suite