add-shell -V (return code: 1)
/usr/sbin/add-shell: 17: /usr/sbin/add-shell: cannot create /etc/shells.tmp: Permission denied
Either another instance of /usr/sbin/add-shell is running, or it was previously interrupted.
Please examine /etc/shells.tmp to see if it should be moved onto /etc/shells.
add-shell (return code: 1)
usage: /usr/sbin/add-shell shellname [shellname ...]