git-annex/doc/git-annex-metadata.mdwn

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# NAME
git-annex metadata - sets or gets metadata of a file
# SYNOPSIS
git annex metadata `[path ...]`
# DESCRIPTION
The content of an annexed file can have any number of metadata fields
attached to it to describe it. Each metadata field can in turn
have any number of values.
This command can be used to set metadata, or show the currently set
metadata.
When run without any -s or -t parameters, displays the current metadata.
# OPTIONS
* `-g field` / `--get field`
Get the value(s) of a single field.
The values will be output one per line, with no other output, so
this is suitable for use in a script.
* `-s field=value` / `--set field=value`
Set a field's value, removing any old values.
* `-s field+=value` / `--set field+=value`
Add an additional value, preserving any old values.
* `-s field?=value` / `--set field?=value`
Set a value, but only if the field does not already have a value set.
* `-s field-=value` / `--set field-=value`
Remove a value from a field, leaving any other values that the field has
set.
* `-r field` / `--remove field`
Remove all current values of the field.
* `-t tag` / `--tag tag`
Set a tag. Note that a tag is just a value of the "tag" field.
* `-u tag` / `--unset tag`
Unset a tag.
* `--force`
By default, `git annex metadata` refuses to recursively set metadata
throughout the files in a directory. This option enables such recursive
setting.
* file matching options
The [[git-annex-matching-options]](1)
can be used to specify files to act on.
* `--json`
Enable JSON output. This is intended to be parsed by programs that use
git-annex. Each line of output is a JSON object.
* `--all`
Specify instead of a file to get/set metadata on all known keys.
* `--unused`
Specify instead of a file to get/set metadata on
files found by last run of git-annex unused.
* `--key=keyname`
Specify instead of a file to get/set metadata of the specified key.
# EXAMPLES
To set some tags on a file and also its author:
git annex metadata annexscreencast.ogv -t video -t screencast -s author+=Alice
# SEE ALSO
[[git-annex]](1)
[[git-annex-view]](1)
# AUTHOR
Joey Hess <id@joeyh.name>
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