gitrevisions(7) - Linux manual page (original) (raw)
GITREVISIONS(7) Git Manual GITREVISIONS(7)
NAME top
gitrevisions - Specifying revisions and ranges for GitSYNOPSIS top
gitrevisionsDESCRIPTION top
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)](../man1/git-log.1.html)), 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)](../man1/git-show.1.html) and
[git-push(1)](../man1/git-push.1.html)) can also take revision parameters which denote other
objects than commits, e.g. blobs ("files") or trees ("directories
of files").SPECIFYING REVISIONS top
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 _$GITDIR/<refname>_ exists, that is what you mean (this
is usually useful only for **HEAD**, **FETCH_HEAD**, **ORIG_HEAD**,
**MERGE_HEAD**, **REBASE_HEAD**, **REVERT_HEAD**, **CHERRY_PICK_HEAD**,
**BISECT_HEAD** and **AUTO_MERGE**);
2. otherwise, _refs/<refname>_ if it exists;
3. otherwise, _refs/tags/<refname>_ if it exists;
4. otherwise, _refs/heads/<refname>_ if it exists;
5. otherwise, _refs/remotes/<refname>_ if it exists;
6. otherwise, _refs/remotes/<refname>/HEAD_ if it exists.
**HEAD**
names the commit on which you based the changes in the
working tree.
**FETCH_HEAD**
records the branch which you fetched from a remote
repository with your last **git fetch** invocation.
**ORIG_HEAD**
is created by commands that move your **HEAD** in a drastic
way (**git am**, **git merge**, **git rebase**, **git reset**), to record
the position of the **HEAD** before their operation, so that
you can easily change the tip of the branch back to the
state before you ran them.
**MERGE_HEAD**
records the commit(s) which you are merging into your
branch when you run **git merge**.
**REBASE_HEAD**
during a rebase, records the commit at which the operation
is currently stopped, either because of conflicts or an
**edit** command in an interactive rebase.
**REVERT_HEAD**
records the commit which you are reverting when you run
**git revert**.
**CHERRY_PICK_HEAD**
records the commit which you are cherry-picking when you
run **git cherry-pick**.
**BISECT_HEAD**
records the current commit to be tested when you run **git**
**bisect --no-checkout**.
**AUTO_MERGE**
records a tree object corresponding to the state the _ort_
merge strategy wrote to the working tree when a merge
operation resulted in conflicts.
Note that any of the _refs/*_ cases above may come either from
the **$GIT_DIR/refs** directory or from the **$GIT_DIR/packed-refs**
file. While the ref name encoding is unspecified, UTF-8 is
preferred as some output processing may assume ref names in
UTF-8.
_@_
_@_ alone is a shortcut for **HEAD**.
_[<refname>]@{<date>}_, e.g. _master@{yesterday}_, _HEAD@{5 minutes_
_ago}_
A ref followed by the suffix _@_ with a date specification
enclosed in a brace pair (e.g. _{yesterday}_, _{1 month 2 weeks_
_3 days 1 hour 1 second ago}_ or _{1979-02-26 18:30:00}_)
specifies the value of the ref at a prior point in time. This
suffix may only be used immediately following a ref name and
the ref must have an existing log (_$GITDIR/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 (_$GITDIR/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^^3^2SPECIFYING RANGES top
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 ^ (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 ^ 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 top
_<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 FSEE ALSO top
[git-rev-parse(1)](../man1/git-rev-parse.1.html)GIT top
Part of the [git(1)](../man1/git.1.html) suiteCOLOPHON top
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a better or more up-to-date source for the page, or you have
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(which is _not_ part of the original manual page), send a mail to
man-pages@man7.orgGit 2.48.1.166.g58b580 2025-01-31 GITREVISIONS(7)
Pages that refer to this page:git(1), git-cat-file(1), git-check-ref-format(1), git-cherry-pick(1), git-config(1), git-diff(1), git-fast-import(1), git-format-patch(1), gitk(1), git-log(1), git-push(1), git-range-diff(1), git-rebase(1), git-reflog(1), git-revert(1), git-shortlog(1), git-show(1), git-show-branch(1), stg(1), gitcore-tutorial(7), gitglossary(7)