shells - list of allowed login shells
/etc/shells is an ASCII file containing a list of legal shells on the
system. Each shell is listed in the file by its absolute path name.
Lines or portions of lines beginning with # are assumed to be comments
and are ignored. Blank lines are also ignored.
shells was developed by HP and the University of California, Berkeley.
chsh(1), ftpd(1M), getusershell(3C).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000