Listing each branch and its last revision's date in Git

Question

I need to delete old and unmaintained branches from our remote repository. I\'m trying to find a way with which to list the remote branches by their last modified date, and

Answer 1

Here is what I use:

git for-each-ref --sort='-committerdate:iso8601' --format=' %(committerdate:iso8601)%09%(refname)' refs/heads

This is the output:

2014-01-22 11:43:18 +0100       refs/heads/master
2014-01-22 11:43:18 +0100       refs/heads/a
2014-01-17 12:34:01 +0100       refs/heads/b
2014-01-14 15:58:33 +0100       refs/heads/maint
2013-12-11 14:20:06 +0100       refs/heads/d/e
2013-12-09 12:48:04 +0100       refs/heads/f

For remote branches, just use "refs/remotes" instead of "refs/heads":

git for-each-ref --sort='-committerdate:iso8601' --format=' %(committerdate:iso8601)%09%(refname)' refs/remotes

Building on n8tr's answer, if you are also interested in the last author on the the branch, and if you have the "column" tool available, you can use:

git for-each-ref --sort='-committerdate:iso8601' --format='%(committerdate:relative)|%(refname:short)|%(committername)' refs/remotes/ | column -s '|' -t

Which will give you:

21 minutes ago  refs/remotes/a        John Doe
6 hours ago     refs/remotes/b        Jane Doe
6 days ago      refs/remotes/master   John Doe

You may want to call "git fetch --prune" before to have the latest information.