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NAME
gitrevisions - Specifying revisions and ranges for Git
SYNOPSIS
gitrevisions
DESCRIPTION
Many Git commands take revision parameters as arguments. Depending on the command, they
denote a specific commit or, for commands which walk the revision graph (such as git-
log(1)), all commits which are reachable from that commit. For commands that walk the
revision graph one can also specify a range of revisions explicitly.
In addition, some Git commands (such as git-show(1) and git-push(1)) can also take
revision parameters which denote other objects than commits, e.g. blobs ("files") or trees
("directories of files").
SPECIFYING REVISIONS
A revision parameter <rev> typically, but not necessarily, names a commit object. It uses
what is called an extended SHA-1 syntax. Here are various ways to spell object names. The
ones listed near the end of this list name trees and blobs contained in a commit.
Note
This document shows the "raw" syntax as seen by git. The shell and other UIs might
require additional quoting to protect special characters and to avoid word splitting.
<sha1>, e.g. dae86e1950b1277e545cee180551750029cfe735, dae86e
The full SHA-1 object name (40-byte hexadecimal string), or a leading substring that
is unique within the repository. E.g. dae86e1950b1277e545cee180551750029cfe735 and
dae86e both name the same commit object if there is no other object in your repository
whose object name starts with dae86e.
<describeOutput>, e.g. v1.7.4.2-679-g3bee7fb
Output from git describe; i.e. a closest tag, optionally followed by a dash and a
number of commits, followed by a dash, a g, and an abbreviated object name.
<refname>, e.g. master, heads/master, refs/heads/master
A symbolic ref name. E.g. master typically means the commit object referenced by
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. When ambiguous, a
<refname> is disambiguated by taking the first match in the following rules:
1. If $GIT_DIR/<refname> exists, that is what you mean (this is usually useful only
for HEAD, FETCH_HEAD, ORIG_HEAD, MERGE_HEAD, REBASE_HEAD, REVERT_HEAD,
CHERRY_PICK_HEAD, BISECT_HEAD and AUTO_MERGE);
2. otherwise, refs/<refname> if it exists;
3. otherwise, refs/tags/<refname> if it exists;
4. otherwise, refs/heads/<refname> if it exists;
5. otherwise, refs/remotes/<refname> if it exists;
6. otherwise, refs/remotes/<refname>/HEAD if it exists.
HEAD
names the commit on which you based the changes in the working tree.
FETCH_HEAD
records the branch which you fetched from a remote repository with your last git
fetch invocation.
ORIG_HEAD
is created by commands that move your HEAD in a drastic way (git am, git merge,
git rebase, git reset), to record the position of the HEAD before their operation,
so that you can easily change the tip of the branch back to the state before you
ran them.
MERGE_HEAD
records the commit(s) which you are merging into your branch when you run git
merge.
REBASE_HEAD
during a rebase, records the commit at which the operation is currently stopped,
either because of conflicts or an edit command in an interactive rebase.
REVERT_HEAD
records the commit which you are reverting when you run git revert.
CHERRY_PICK_HEAD
records the commit which you are cherry-picking when you run git cherry-pick.
BISECT_HEAD
records the current commit to be tested when you run git bisect --no-checkout.
AUTO_MERGE
records a tree object corresponding to the state the ort merge strategy wrote to
the working tree when a merge operation resulted in conflicts.
Note that any of the refs/* cases above may come either from the $GIT_DIR/refs
directory or from the $GIT_DIR/packed-refs file. While the ref name encoding is
unspecified, UTF-8 is preferred as some output processing may assume ref names in
UTF-8.
@
@ alone is a shortcut for HEAD.
[<refname>]@{<date>}, e.g. master@{yesterday}, HEAD@{5 minutes ago}
A ref followed by the suffix @ with a date specification enclosed in a brace pair
(e.g. {yesterday}, {1 month 2 weeks 3 days 1 hour 1 second ago} or {1979-02-26
18:30:00}) specifies the value of the ref at a prior point in time. This suffix may
only be used immediately following a ref name and the ref must have an existing log
($GIT_DIR/logs/<ref>). Note that this looks up the state of your local ref at a given
time; e.g., what was in your local master branch last week. If you want to look at
commits made during certain times, see --since and --until.
<refname>@{<n>}, e.g. master@{1}
A ref followed by the suffix @ with an ordinal specification enclosed in a brace pair
(e.g. {1}, {15}) specifies the n-th prior value of that ref. For example master@{1}
is the immediate prior value of master while master@{5} is the 5th prior value of
master. This suffix may only be used immediately following a ref name and the ref must
have an existing log ($GIT_DIR/logs/<refname>).
@{<n>}, e.g. @{1}
You can use the @ construct with an empty ref part to get at a reflog entry of the
current branch. For example, if you are on branch blabla then @{1} means the same as
blabla@{1}.
@{-<n>}, e.g. @{-1}
The construct @{-<n>} means the <n>th branch/commit checked out before the current
one.
[<branchname>]@{upstream}, e.g. master@{upstream}, @{u}
A branch B may be set up to build on top of a branch X (configured with
branch.<name>.merge) at a remote R (configured with the branch X taken from remote R,
typically found at refs/remotes/R/X.
[<branchname>]@{push}, e.g. master@{push}, @{push}
The suffix @{push} reports the branch "where we would push to" if git push were run
while branchname was checked out (or the current HEAD if no branchname is specified).
Like for @{upstream}, we report the remote-tracking branch that corresponds to that
branch at the remote.
Here’s an example to make it more clear:
$ git config push.default current
$ git config remote.pushdefault myfork
$ git switch -c mybranch origin/master
$ git rev-parse --symbolic-full-name @{upstream}
refs/remotes/origin/master
$ git rev-parse --symbolic-full-name @{push}
refs/remotes/myfork/mybranch
Note in the example that we set up a triangular workflow, where we pull from one
location and push to another. In a non-triangular workflow, @{push} is the same as
@{upstream}, and there is no need for it.
This suffix is also accepted when spelled in uppercase, and means the same thing no
matter the case.
<rev>^[<n>], e.g. HEAD^, v1.5.1^0
A suffix ^ to a revision parameter means the first parent of that commit object. ^<n>
means the <n>th parent (i.e. <rev>^ 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.
<rev>~[<n>], e.g. HEAD~, master~3
A suffix ~ to a revision parameter means the first parent of that commit object. A
suffix ~<n> to a revision parameter means the commit object that is the <n>th
generation ancestor of the named commit object, following only the first parents. I.e.
<rev>~3 is equivalent to <rev>^^^ which is equivalent to <rev>^1^1^1. See below for an
illustration of the usage of this form.
<rev>^{<type>}, e.g. v0.99.8^{commit}
A suffix ^ followed by an object type name enclosed in brace pair means dereference
the object at <rev> recursively until an object of type <type> is found or the object
cannot be dereferenced anymore (in which case, barf). For example, if <rev> is a
commit-ish, <rev>^{commit} describes the corresponding commit object. Similarly, if
<rev> is a tree-ish, <rev>^{tree} describes the corresponding tree object. <rev>^0 is
a short-hand for <rev>^{commit}.
<rev>^{object} can be used to make sure <rev> names an object that exists, without
requiring <rev> to be a tag, and without dereferencing <rev>; because a tag is already
an object, it does not have to be dereferenced even once to get to an object.
<rev>^{tag} can be used to ensure that <rev> identifies an existing tag object.
<rev>^{}, e.g. v0.99.8^{}
A suffix ^ followed by an empty brace pair means the object could be a tag, and
dereference the tag recursively until a non-tag object is found.
<rev>^{/<text>}, e.g. HEAD^{/fix nasty bug}
A suffix ^ to a revision parameter, followed by a brace pair that contains a text led
by a slash, is the same as the :/fix nasty bug syntax below except that it returns the
youngest matching commit which is reachable from the <rev> before ^.
:/<text>, e.g. :/fix nasty bug
A colon, followed by a slash, followed by a text, names a commit whose commit message
matches the specified regular expression. This name returns the youngest matching
commit which is reachable from any ref, including HEAD. The regular expression can
match any part of the commit message. To match messages starting with a string, one
can use e.g. :/^foo. The special sequence :/! is reserved for modifiers to what is
matched. :/!-foo performs a negative match, while :/!!foo matches a literal !
character, followed by foo. Any other sequence beginning with :/! is reserved for
now. Depending on the given text, the shell’s word splitting rules might require
additional quoting.
<rev>:<path>, e.g. HEAD:README, master:./README
A suffix : followed by a path names the blob or tree at the given path in the tree-ish
object named by the part before the colon. A path starting with ./ or ../ is relative
to the current working directory. The given path will be converted to be relative to
the working tree’s root directory. This is most useful to address a blob or tree from
a commit or tree that has the same tree structure as the working tree.
:[<n>:]<path>, e.g. :0:README, :README
A colon, optionally followed by a stage number (0 to 3) and a colon, followed by a
path, names a blob object in the index at the given path. A missing stage number (and
the colon that follows it) names a stage 0 entry. During a merge, stage 1 is the
common ancestor, stage 2 is the target branch’s version (typically the current
branch), and stage 3 is the version from the branch which is being merged.
Here is an illustration, by Jon Loeliger. Both commit nodes B and C are parents of commit
node A. Parent commits are ordered left-to-right.
G H I J
\ / \ /
D E F
\ | / \
\ | / |
\|/ |
B C
\ /
\ /
A
A = = A^0
B = A^ = A^1 = A~1
C = = A^2
D = A^^ = A^1^1 = A~2
E = B^2 = A^^2
F = B^3 = A^^3
G = A^^^ = A^1^1^1 = A~3
H = D^2 = B^^2 = A^^^2 = A~2^2
I = F^ = B^3^ = A^^3^
J = F^2 = B^3^2 = A^^3^2
SPECIFYING RANGES
History traversing commands such as git log operate on a set of commits, not just a single
commit.
For these commands, specifying a single revision, using the notation described in the
previous section, means the set of commits reachable from the given commit.
Specifying several revisions means the set of commits reachable from any of the given
commits.
A commit’s reachable set is the commit itself and the commits in its ancestry chain.
There are several notations to specify a set of connected commits (called a "revision
range"), illustrated below.
Commit Exclusions
^<rev> (caret) Notation
To exclude commits reachable from a commit, a prefix ^ notation is used. E.g. ^r1 r2
means commits reachable from r2 but exclude the ones reachable from r1 (i.e. r1 and
its ancestors).
Dotted Range Notations
The .. (two-dot) Range Notation
The ^r1 r2 set operation appears so often that there is a shorthand for it. When you
have two commits r1 and r2 (named according to the syntax explained in SPECIFYING
REVISIONS above), you can ask for commits that are reachable from r2 excluding those
that are reachable from r1 by ^r1 r2 and it can be written as r1..r2.
The ... (three-dot) Symmetric Difference Notation
A similar notation r1...r2 is called symmetric difference of r1 and r2 and is defined
as r1 r2 --not $(git merge-base --all r1 r2). It is the set of commits that are
reachable from either one of r1 (left side) or r2 (right side) but not from both.
In these two shorthand notations, you can omit one end and let it default to HEAD. For
example, origin.. is a shorthand for origin..HEAD and asks "What did I do since I forked
from the origin branch?" Similarly, ..origin is a shorthand for HEAD..origin and asks
"What did the origin do since I forked from them?" Note that .. would mean HEAD..HEAD
which is an empty range that is both reachable and unreachable from HEAD.
Commands that are specifically designed to take two distinct ranges (e.g. "git range-diff
R1 R2" to compare two ranges) do exist, but they are exceptions. Unless otherwise noted,
all "git" commands that operate on a set of commits work on a single revision range. In
other words, writing two "two-dot range notation" next to each other, e.g.
$ git log A..B C..D
does not specify two revision ranges for most commands. Instead it will name a single
connected set of commits, i.e. those that are reachable from either B or D but are
reachable from neither A or C. In a linear history like this:
---A---B---o---o---C---D
because A and B are reachable from C, the revision range specified by these two dotted
ranges is a single commit D.
Other <rev>^ Parent Shorthand Notations
Three other shorthands exist, particularly useful for merge commits, for naming a set that
is formed by a commit and its parent commits.
The r1^@ notation means all parents of r1.
The r1^! notation includes commit r1 but excludes all of its parents. By itself, this
notation denotes the single commit r1.
The <rev>^-[<n>] notation includes <rev> but excludes the <n>th parent (i.e. a shorthand
for <rev>^<n>..<rev>), with <n> = 1 if not given. This is typically useful for merge
commits where you can just pass <commit>^- to get all the commits in the branch that was
merged in merge commit <commit> (including <commit> itself).
While <rev>^<n> was about specifying a single commit parent, these three notations also
consider its parents. For example you can say HEAD^2^@, however you cannot say HEAD^@^2.
REVISION RANGE SUMMARY
<rev>
Include commits that are reachable from <rev> (i.e. <rev> and its ancestors).
^<rev>
Exclude commits that are reachable from <rev> (i.e. <rev> and its ancestors).
<rev1>..<rev2>
Include commits that are reachable from <rev2> but exclude those that are reachable
from <rev1>. When either <rev1> or <rev2> is omitted, it defaults to HEAD.
<rev1>...<rev2>
Include commits that are reachable from either <rev1> or <rev2> but exclude those that
are reachable from both. When either <rev1> or <rev2> is omitted, it defaults to HEAD.
<rev>^@, e.g. HEAD^@
A suffix ^ followed by an at sign is the same as listing all parents of <rev>
(meaning, include anything reachable from its parents, but not the commit itself).
<rev>^!, e.g. HEAD^!
A suffix ^ followed by an exclamation mark is the same as giving commit <rev> and all
its parents prefixed with ^ to exclude them (and their ancestors).
<rev>^-<n>, e.g. HEAD^-, HEAD^-2
Equivalent to <rev>^<n>..<rev>, with <n> = 1 if not given.
Here are a handful of examples using the Loeliger illustration above, with each step in
the notation’s expansion and selection carefully spelt out:
Args Expanded arguments Selected commits
D G H D
D F G H I J D F
^G D H D
^D B E I J F B
^D B C E I J F B C
C I J F C
B..C = ^B C C
B...C = B ^F C G H D E B C
B^- = B^..B
= ^B^1 B E I J F B
C^@ = C^1
= F I J F
B^@ = B^1 B^2 B^3
= D E F D G H E F I J
C^! = C ^C^@
= C ^C^1
= C ^F C
B^! = B ^B^@
= B ^B^1 ^B^2 ^B^3
= B ^D ^E ^F B
F^! D = F ^I ^J D G H D F
SEE ALSO
git-rev-parse(1)
GIT
Part of the git(1) suite