git-peek-remote(1): Lists references in remote ...

NAME

--exec=<git-upload-pack>: Use this to specify the path to git-upload-pack on the remote side, if it is not found on your $PATH. Some installations of sshd ignores the user's environment setup scripts for login shells (e.g. .bash_profile) and your privately installed git may not be found on the system default $PATH. Another workaround suggested is to set up your $PATH in ".bashrc", but this flag is for people who do not want to pay the overhead for non-interactive shells, but prefer having a lean .bashrc file (they set most of the things up in .bash_profile).
<host>: A remote host that houses the repository. When this part is specified, git-upload-pack is invoked via ssh.
<directory>: The repository to sync from.