When advertising tips of available history from an alternate, use the shell to
execute the specified command instead of linkgit:git-for-each-ref[1]. The
first argument is the absolute path of the alternate. Output must contain one
- hex object id per line (i.e., the same as produce by `git for-each-ref
+ hex object id per line (i.e., the same as produced by `git for-each-ref
--format='%(objectname)'`).
+
Note that you cannot generally put `git for-each-ref` directly into the config