git-annex-lookupkey - Man Page
looks up key used for file
Synopsis
git annex lookupkey [file ...]
Description
This plumbing-level command looks up the key used for a file in the index. The key is output to stdout. If there is no key (because the file is not present in the index, or is not a git-annex managed file), nothing is output, and it exits nonzero.
Options
- --ref
- Rather than looking for the specified files in the index, interpet them as git refs. For example to find the key used for somefile in tag v1.0: - git-annex lookupkey v1.0:somefile 
- --batch
- Enable batch mode, in which a line containing the filename is read from stdin, the key is output to stdout (with a trailing newline), and repeat. - Note that if there is no key corresponding to the file, an empty line is output to stdout instead. 
- -z
- Makes the --batch input be delimited by nulls instead of the usual newlines. 
Also the git-annex-common-options(1) can be used.
See Also
Author
Joey Hess <id@joeyh.name>