In its first form, the command provides the content or the type of an object in the repository. The type is required unless -t or -p is used to find the object type, or -s is used to find the object size, or --textconv is used (which implies type "blob").
In the second form, a list of objects (separated by linefeeds) is provided on stdin, and the SHA-1, type, and size of each object is printed on stdout.
The name of the object to show. For a more complete list of ways to spell object names, see the "SPECIFYING REVISIONS" section in
Instead of the content, show the object type identified by <object>.
Instead of the content, show the object size identified by <object>.
Suppress all output; instead exit with zero status if <object> exists and is a valid object.
Pretty-print the contents of <object> based on its type.
Typically this matches the real type of <object> but asking for a type that can trivially be dereferenced from the given <object> is also permitted. An example is to ask for a "tree" with <object> being a commit object that contains it, or to ask for a "blob" with <object> being a tag object that points at it.
Show the content as transformed by a textconv filter. In this case, <object> has be of the form <tree-ish>:<path>, or :<path> in order to apply the filter to the content recorded in the index at <path>.
Print object information and contents for each object provided on stdin. May not be combined with any other options or arguments. See the section
below for details.
Print object information for each object provided on stdin. May not be combined with any other options or arguments. See the section
below for details.
Instead of reading a list of objects on stdin, perform the requested batch operation on all objects in the repository and any alternate object stores (not just reachable objects). Requires
be specified. Note that the objects are visited in order sorted by their hashes.
Normally batch output is flushed after each object is output, so that a process can interactively read and write from
cat-file. With this option, the output uses normal stdio buffering; this is much more efficient when invoking
on a large number of objects.
Allow -s or -t to query broken/corrupt objects of unknown type.
With --batch or --batch-check, follow symlinks inside the repository when requesting objects with extended SHA-1 expressions of the form tree-ish:path-in-tree. Instead of providing output about the link itself, provide output about the linked-to object. If a symlink points outside the tree-ish (e.g. a link to /foo or a root-level link to ../foo), the portion of the link which is outside the tree will be printed.
This option does not (currently) work correctly when an object in the index is specified (e.g.
HEAD:link) rather than one in the tree.
This option cannot (currently) be used unless
For example, consider a git repository containing:
f: a file containing "hello\n"
link: a symlink to f
dir/link: a symlink to ../f
plink: a symlink to ../f
alink: a symlink to /etc/passwd
For a regular file
echo HEAD:f | git cat-file --batch
ce013625030ba8dba906f756967f9e9ca394464a blob 6
echo HEAD:link | git cat-file --batch --follow-symlinks
would print the same thing, as would
HEAD:dir/link, as they both point at
--follow-symlinks, these would print data about the symlink itself. In the case of
HEAD:link, you would see
4d1ae35ba2c8ec712fa2a379db44ad639ca277bd blob 1
point outside the tree, so they would respectively print:
If -t is specified, one of the <type>.
If -s is specified, the size of the <object> in bytes.
If -e is specified, no output.
If -p is specified, the contents of <object> are pretty-printed.
If <type> is specified, the raw (though uncompressed) contents of the <object> will be returned.
If --batch or --batch-check is given, cat-file will read objects from stdin, one per line, and print information about them. By default, the whole line is considered as an object, as if it were fed to git-rev-parse(1).
You can specify the information shown for each object by using a custom <format>. The <format> is copied literally to stdout for each object, with placeholders of the form %(atom) expanded, followed by a newline. The available atoms are:
The 40-hex object name of the object.
The type of of the object (the same as
The size, in bytes, of the object (the same as
The size, in bytes, that the object takes up on disk. See the note about on-disk sizes in the
If the object is stored as a delta on-disk, this expands to the 40-hex sha1 of the delta base object. Otherwise, expands to the null sha1 (40 zeroes). See
If this atom is used in the output string, input lines are split at the first whitespace boundary. All characters before that whitespace are considered to be the object name; characters after that first run of whitespace (i.e., the "rest" of the line) are output in place of the
If no format is specified, the default format is %(objectname) %(objecttype) %(objectsize).
If --batch is specified, the object information is followed by the object contents (consisting of %(objectsize) bytes), followed by a newline.
For example, --batch without a custom format would produce:
<sha1> SP <type> SP <size> LF
Whereas --batch-check=%(objectname) %(objecttype) would produce:
<sha1> SP <type> LF
If a name is specified on stdin that cannot be resolved to an object in the repository, then cat-file will ignore any custom format and print:
<object> SP missing LF
If --follow-symlinks is used, and a symlink in the repository points outside the repository, then cat-file will ignore any custom format and print:
symlink SP <size> LF
The symlink will either be absolute (beginning with a /), or relative to the tree root. For instance, if dir/link points to ../../foo, then <symlink> will be ../foo. <size> is the size of the symlink in bytes.
If --follow-symlinks is used, the following error messages will be displayed:
<object> SP missing LF
is printed when the initial symlink requested does not exist.
dangling SP <size> LF
is printed when the initial symlink exists, but something that it (transitive-of) points to does not.
loop SP <size> LF
is printed for symlink loops (or any symlinks that require more than 40 link resolutions to resolve).
notdir SP <size> LF
is printed when, during symlink resolution, a file is used as a directory name.