NAMEadd-shell - add shells to the list of valid login shells
SYNOPSISadd-shell shellname [shellname...]
DESCRIPTIONadd-shell copies /etc/shells to /etc/shells.tmp, adds the given shells to this file if they are not already present, and copies this temporary file back to /etc/shells. The shells must be provided by their full pathnames.
SEE ALSOshells(5) 12 May 2011 ADD-SHELL(8)