6 gitcli - Git command-line interface and conventions
16 This manual describes the convention used throughout Git CLI.
18 Many commands take revisions (most often "commits", but sometimes
19 "tree-ish", depending on the context and command) and paths as their
20 arguments. Here are the rules:
22 * Revisions come first and then paths.
23 E.g. in `git diff v1.0 v2.0 arch/x86 include/asm-x86`,
24 `v1.0` and `v2.0` are revisions and `arch/x86` and `include/asm-x86`
27 * When an argument can be misunderstood as either a revision or a path,
28 they can be disambiguated by placing `--` between them.
29 E.g. `git diff -- HEAD` is, "I have a file called HEAD in my work
30 tree. Please show changes between the version I staged in the index
31 and what I have in the work tree for that file", not "show difference
32 between the HEAD commit and the work tree as a whole". You can say
33 `git diff HEAD --` to ask for the latter.
35 * Without disambiguating `--`, Git makes a reasonable guess, but errors
36 out and asking you to disambiguate when ambiguous. E.g. if you have a
37 file called HEAD in your work tree, `git diff HEAD` is ambiguous, and
38 you have to say either `git diff HEAD --` or `git diff -- HEAD` to
41 * Because `--` disambiguates revisions and paths in some commands, it
42 cannot be used for those commands to separate options and revisions.
43 You can use `--end-of-options` for this (it also works for commands
44 that do not distinguish between revisions in paths, in which case it
45 is simply an alias for `--`).
47 When writing a script that is expected to handle random user-input, it is
48 a good practice to make it explicit which arguments are which by placing
49 disambiguating `--` at appropriate places.
51 * Many commands allow wildcards in paths, but you need to protect
52 them from getting globbed by the shell. These two mean different
55 --------------------------------
58 --------------------------------
60 The former lets your shell expand the fileglob, and you are asking
61 the dot-C files in your working tree to be overwritten with the version
62 in the index. The latter passes the `*.c` to Git, and you are asking
63 the paths in the index that match the pattern to be checked out to your
64 working tree. After running `git add hello.c; rm hello.c`, you will _not_
65 see `hello.c` in your working tree with the former, but with the latter
68 * Just as the filesystem '.' (period) refers to the current directory,
69 using a '.' as a repository name in Git (a dot-repository) is a relative
70 path and means your current repository.
72 Here are the rules regarding the "flags" that you should follow when you are
75 * it's preferred to use the non-dashed form of Git commands, which means that
76 you should prefer `git foo` to `git-foo`.
78 * splitting short options to separate words (prefer `git foo -a -b`
79 to `git foo -ab`, the latter may not even work).
81 * when a command-line option takes an argument, use the 'stuck' form. In
82 other words, write `git foo -oArg` instead of `git foo -o Arg` for short
83 options, and `git foo --long-opt=Arg` instead of `git foo --long-opt Arg`
84 for long options. An option that takes optional option-argument must be
85 written in the 'stuck' form.
87 * when you give a revision parameter to a command, make sure the parameter is
88 not ambiguous with a name of a file in the work tree. E.g. do not write
89 `git log -1 HEAD` but write `git log -1 HEAD --`; the former will not work
90 if you happen to have a file called `HEAD` in the work tree.
92 * many commands allow a long option `--option` to be abbreviated
93 only to their unique prefix (e.g. if there is no other option
94 whose name begins with `opt`, you may be able to spell `--opt` to
95 invoke the `--option` flag), but you should fully spell them out
96 when writing your scripts; later versions of Git may introduce a
97 new option whose name shares the same prefix, e.g. `--optimize`,
98 to make a short prefix that used to be unique no longer unique.
101 ENHANCED OPTION PARSER
102 ----------------------
103 From the Git 1.5.4 series and further, many Git commands (not all of them at the
104 time of the writing though) come with an enhanced option parser.
106 Here is a list of the facilities provided by this option parser.
111 Commands which have the enhanced option parser activated all understand a
112 couple of magic command-line options:
115 gives a pretty printed usage of the command.
117 ---------------------------------------------
119 usage: git describe [<options>] <commit-ish>*
120 or: git describe [<options>] --dirty
122 --contains find the tag that comes after the commit
123 --debug debug search strategy on stderr
125 --tags use any tag, even unannotated
126 --long always use long format
127 --abbrev[=<n>] use <n> digits to display SHA-1s
128 ---------------------------------------------
131 Some Git commands take options that are only used for plumbing or that
132 are deprecated, and such options are hidden from the default usage. This
133 option gives the full list of options.
138 Options with long option names can be negated by prefixing `--no-`. For
139 example, `git branch` has the option `--track` which is 'on' by default. You
140 can use `--no-track` to override that behaviour. The same goes for `--color`
144 Aggregating short options
145 ~~~~~~~~~~~~~~~~~~~~~~~~~
146 Commands that support the enhanced option parser allow you to aggregate short
147 options. This means that you can for example use `git rm -rf` or
151 Abbreviating long options
152 ~~~~~~~~~~~~~~~~~~~~~~~~~
153 Commands that support the enhanced option parser accepts unique
154 prefix of a long option as if it is fully spelled out, but use this
155 with a caution. For example, `git commit --amen` behaves as if you
156 typed `git commit --amend`, but that is true only until a later version
157 of Git introduces another option that shares the same prefix,
158 e.g. `git commit --amenity` option.
161 Separating argument from the option
162 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
163 You can write the mandatory option parameter to an option as a separate
164 word on the command line. That means that all the following uses work:
166 ----------------------------
167 $ git foo --long-opt=Arg
168 $ git foo --long-opt Arg
171 ----------------------------
173 However, this is *NOT* allowed for switches with an optional value, where the
174 'stuck' form must be used:
175 ----------------------------
176 $ git describe --abbrev HEAD # correct
177 $ git describe --abbrev=10 HEAD # correct
178 $ git describe --abbrev 10 HEAD # NOT WHAT YOU MEANT
179 ----------------------------
182 NOTES ON FREQUENTLY CONFUSED OPTIONS
183 ------------------------------------
185 Many commands that can work on files in the working tree
186 and/or in the index can take `--cached` and/or `--index`
187 options. Sometimes people incorrectly think that, because
188 the index was originally called cache, these two are
189 synonyms. They are *not* -- these two options mean very
192 * The `--cached` option is used to ask a command that
193 usually works on files in the working tree to *only* work
194 with the index. For example, `git grep`, when used
195 without a commit to specify from which commit to look for
196 strings in, usually works on files in the working tree,
197 but with the `--cached` option, it looks for strings in
200 * The `--index` option is used to ask a command that
201 usually works on files in the working tree to *also*
202 affect the index. For example, `git stash apply` usually
203 merges changes recorded in a stash entry to the working tree,
204 but with the `--index` option, it also merges changes to
207 `git apply` command can be used with `--cached` and
208 `--index` (but not at the same time). Usually the command
209 only affects the files in the working tree, but with
210 `--index`, it patches both the files and their index
211 entries, and with `--cached`, it modifies only the index
214 See also https://lore.kernel.org/git/7v64clg5u9.fsf@assigned-by-dhcp.cox.net/ and
215 https://lore.kernel.org/git/7vy7ej9g38.fsf@gitster.siamese.dyndns.org/ for further
218 Some other commands that also work on files in the working tree and/or
219 in the index can take `--staged` and/or `--worktree`.
221 * `--staged` is exactly like `--cached`, which is used to ask a
222 command to only work on the index, not the working tree.
224 * `--worktree` is the opposite, to ask a command to work on the
225 working tree only, not the index.
227 * The two options can be specified together to ask a command to work
228 on both the index and the working tree.
232 Part of the linkgit:git[1] suite