git commit -a -m "another"
'
-head=`git rev-parse --verify HEAD^0`
-prev=`git rev-parse --verify HEAD^1`
+head=$(git rev-parse --verify HEAD^0)
+prev=$(git rev-parse --verify HEAD^1)
# the internals of the commit-diff command are the same as the regular
# commit, so only a basic test of functionality is needed since we've