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git-rev-parse - Pick out and massage parameters.
'git-rev-parse' [ --option ] <args>...
Many git Porcelainish commands take mixture of flags
(i.e. parameters that begin with a dash '-') and parameters
meant for underlying `git-rev-list` command they use internally
and flags and parameters for other commands they use as the
downstream of `git-rev-list`. This command is used to
distinguish between them.
Do not output flags and parameters not meant for
`git-rev-list` command.
Do not output flags and parameters meant for
`git-rev-list` command.
Do not output non-flag parameters.
Do not output flag parameters.
--default <arg>::
If there is no parameter given by the user, use `<arg>`
The parameter given must be usable as a single, valid
object name. Otherwise barf and abort.
Usually the output is made one line per flag and
parameter. This option makes output a single line,
properly quoted for consumption by shell. Useful when
you expect your parameter to contain whitespaces and
newlines (e.g. when using pickaxe `-S` with
When showing object names, prefix them with '^' and
strip '^' prefix from the object names that already have
Usually the object names are output in SHA1 form (with
possible '^' prefix); this option makes them output in a
form as close to the original input as possible.
Show all refs found in `$GIT_DIR/refs`.
When the command is invoked from a directory show the
path of the current directory relative to the top-level
Flags and parameters to be parsed.
A revision parameter typically names a commit object. They use
what is called an 'extended SHA1' syntax.
* The full SHA1 object name (40-byte hexadecimal string), or
a substring of such that is unique within the repository.
E.g. dae86e1950b1277e545cee180551750029cfe735 and dae86e both
name the same commit object if there are no other object in
your repository whose object name starts with dae86e.
* A symbolic ref name. E.g. 'master' typically means the commit
object referenced by $GIT_DIR/refs/heads/master. If you
happen to have both heads/master and tags/master, you can
explicitly say 'heads/master' to tell GIT which one you mean.
* A suffix '^' to a revision parameter means the first parent of
that commit object. '^<n>' means the <n>th parent (i.e.
is equivalent to 'rev^1'). As a special rule,
'rev^0' means the commit itself and is used when 'rev' is the
object name of a tag object that refers to a commit object.
* A suffix '~<n>' to a revision parameter means the commit
object that is the <n>th generation grand-parent of the named
commit object, following only the first parent. I.e. rev~3 is
equivalent to rev^^^ which is equivalent to rev^1^1^1.
'git-rev-parse' also accepts a prefix '^' to revision parameter,
which is passed to 'git-rev-list'. Two revision parameters
concatenated with '..' is a short-hand for writing a range
between them. I.e. 'r1..r2' is equivalent to saying '^r1 r2'
Written by Linus Torvalds <> and
Junio C Hamano <>
Documentation by Junio C Hamano and the git-list <>.
Part of the link:git.html[git] suite