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7fc9d69f JH |
1 | git-rev-parse(1) |
2 | ================ | |
3 | ||
4 | NAME | |
5 | ---- | |
5077fa9c | 6 | git-rev-parse - Pick out and massage parameters. |
7fc9d69f JH |
7 | |
8 | ||
9 | SYNOPSIS | |
10 | -------- | |
11 | 'git-rev-parse' [ --option ] <args>... | |
12 | ||
13 | DESCRIPTION | |
14 | ----------- | |
5077fa9c JH |
15 | |
16 | Many git Porcelainish commands take mixture of flags | |
17 | (i.e. parameters that begin with a dash '-') and parameters | |
18 | meant for underlying `git-rev-list` command they use internally | |
19 | and flags and parameters for other commands they use as the | |
20 | downstream of `git-rev-list`. This command is used to | |
21 | distinguish between them. | |
7fc9d69f JH |
22 | |
23 | ||
24 | OPTIONS | |
25 | ------- | |
5077fa9c JH |
26 | --revs-only:: |
27 | Do not output flags and parameters not meant for | |
28 | `git-rev-list` command. | |
29 | ||
30 | --no-revs:: | |
31 | Do not output flags and parameters meant for | |
32 | `git-rev-list` command. | |
33 | ||
34 | --flags:: | |
35 | Do not output non-flag parameters. | |
36 | ||
37 | --no-flags:: | |
38 | Do not output flag parameters. | |
39 | ||
40 | --default <arg>:: | |
41 | If there is no parameter given by the user, use `<arg>` | |
42 | instead. | |
43 | ||
44 | --verify:: | |
45 | The parameter given must be usable as a single, valid | |
46 | object name. Otherwise barf and abort. | |
47 | ||
48 | --sq:: | |
49 | Usually the output is made one line per flag and | |
50 | parameter. This option makes output a single line, | |
51 | properly quoted for consumption by shell. Useful when | |
52 | you expect your parameter to contain whitespaces and | |
53 | newlines (e.g. when using pickaxe `-S` with | |
54 | `git-diff-\*`). | |
55 | ||
56 | --not:: | |
babfaba2 JF |
57 | When showing object names, prefix them with '{caret}' and |
58 | strip '{caret}' prefix from the object names that already have | |
5077fa9c JH |
59 | one. |
60 | ||
61 | --symbolic:: | |
62 | Usually the object names are output in SHA1 form (with | |
babfaba2 | 63 | possible '{caret}' prefix); this option makes them output in a |
5077fa9c JH |
64 | form as close to the original input as possible. |
65 | ||
66 | ||
67 | --all:: | |
68 | Show all refs found in `$GIT_DIR/refs`. | |
69 | ||
70 | --show-prefix:: | |
71 | When the command is invoked from a directory show the | |
72 | path of the current directory relative to the top-level | |
73 | directory. | |
7fc9d69f | 74 | |
a3114b34 JH |
75 | --since=datestring, --after=datestring:: |
76 | Parses the date string, and outputs corresponding | |
77 | --max-age= parameter for git-rev-list command. | |
78 | ||
79 | --until=datestring, --before=datestring:: | |
80 | Parses the date string, and outputs corresponding | |
81 | --min-age= parameter for git-rev-list command. | |
82 | ||
7fc9d69f | 83 | <args>...:: |
5077fa9c | 84 | Flags and parameters to be parsed. |
7fc9d69f JH |
85 | |
86 | ||
3a45f625 JH |
87 | SPECIFYING REVISIONS |
88 | -------------------- | |
89 | ||
622ef9df JH |
90 | A revision parameter typically, but not necessarily, names a |
91 | commit object. They use what is called an 'extended SHA1' | |
92 | syntax. | |
3a45f625 JH |
93 | |
94 | * The full SHA1 object name (40-byte hexadecimal string), or | |
95 | a substring of such that is unique within the repository. | |
96 | E.g. dae86e1950b1277e545cee180551750029cfe735 and dae86e both | |
97 | name the same commit object if there are no other object in | |
98 | your repository whose object name starts with dae86e. | |
99 | ||
100 | * A symbolic ref name. E.g. 'master' typically means the commit | |
101 | object referenced by $GIT_DIR/refs/heads/master. If you | |
102 | happen to have both heads/master and tags/master, you can | |
72e9340c | 103 | explicitly say 'heads/master' to tell git which one you mean. |
3a45f625 | 104 | |
babfaba2 JF |
105 | * A suffix '{caret}' to a revision parameter means the first parent of |
106 | that commit object. '{caret}<n>' means the <n>th parent (i.e. | |
107 | 'rev{caret}' | |
108 | is equivalent to 'rev{caret}1'). As a special rule, | |
109 | 'rev{caret}0' means the commit itself and is used when 'rev' is the | |
3a45f625 JH |
110 | object name of a tag object that refers to a commit object. |
111 | ||
112 | * A suffix '~<n>' to a revision parameter means the commit | |
113 | object that is the <n>th generation grand-parent of the named | |
114 | commit object, following only the first parent. I.e. rev~3 is | |
babfaba2 JF |
115 | equivalent to rev{caret}{caret}{caret} which is equivalent to\ |
116 | rev{caret}1{caret}1{caret}1. | |
3a45f625 | 117 | |
622ef9df JH |
118 | * A suffix '{caret}' followed by an object type name enclosed in |
119 | brace pair (e.g. `v0.99.8{caret}\{commit\}`) means the object | |
120 | could be a tag, and dereference the tag recursively until an | |
121 | object of that type is found or the object cannot be | |
122 | dereferenced anymore (in which case, barf). `rev{caret}0` | |
123 | introduced earlier is a short-hand for `rev{caret}\{commit\}`. | |
124 | ||
125 | * A suffix '{caret}' followed by an empty brace pair | |
126 | (e.g. `v0.99.8{caret}\{\}`) means the object could be a tag, | |
127 | and dereference the tag recursively until a non-tag object is | |
128 | found. | |
129 | ||
babfaba2 | 130 | 'git-rev-parse' also accepts a prefix '{caret}' to revision parameter, |
3a45f625 JH |
131 | which is passed to 'git-rev-list'. Two revision parameters |
132 | concatenated with '..' is a short-hand for writing a range | |
babfaba2 | 133 | between them. I.e. 'r1..r2' is equivalent to saying '{caret}r1 r2' |
3a45f625 | 134 | |
2be8fd08 JH |
135 | Here is an illustration, by Jon Loeliger. Both node B and C are |
136 | a commit parents of commit node A. Parent commits are ordered | |
137 | left-to-right. | |
138 | ||
139 | G H I J | |
140 | \ / \ / | |
141 | D E F | |
142 | \ | / | |
143 | \ | / | |
144 | \|/ | |
145 | B C | |
146 | \ / | |
147 | \ / | |
148 | A | |
149 | ||
150 | A = = A^0 | |
151 | B = A^ = A^1 = A~1 | |
152 | C = A^2 = A^2 | |
153 | D = A^^ = A^1^1 = A~2 | |
154 | E = B^2 = A^^2 | |
155 | F = B^3 = A^^3 | |
156 | G = A^^^ = A^1^1^1 = A~3 | |
157 | H = D^2 = B^^2 = A^^^2 = A~2^2 | |
158 | I = F^ = B^3^ = A^^3^ | |
159 | J = F^2 = B^3^2 = A^^3^2 | |
160 | ||
3a45f625 | 161 | |
7fc9d69f JH |
162 | Author |
163 | ------ | |
5077fa9c JH |
164 | Written by Linus Torvalds <torvalds@osdl.org> and |
165 | Junio C Hamano <junkio@cox.net> | |
7fc9d69f JH |
166 | |
167 | Documentation | |
168 | -------------- | |
169 | Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>. | |
170 | ||
171 | GIT | |
172 | --- | |
a7154e91 | 173 | Part of the gitlink:git[7] suite |
7fc9d69f | 174 |