─$ git summary --lines

 project  : xxxxx
 repo age : xx years
fatal: unrecognized argument: --lines
 active   :  days
fatal: unrecognized argument: --lines
 commits  : 0
 authors  :
error: unknown option `--lines'
usage: git shortlog [<options>] [<revision-range>] [[--] <path>...]
   or: git log --pretty=short | git shortlog [<options>]

    -c, --committer       Group by committer rather than author
    -n, --numbered        sort output according to the number of commits per author
    -s, --summary         Suppress commit descriptions, only provides commit count
    -e, --email           Show the email address of each author
    -w[<w>[,<i1>[,<i2>]]]
                          Linewrap output