pam_shells — PAM module to check for valid login shell ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ DESCRIPTION pam_shells is a PAM module that only allows access to the system if the user's shell is listed in /etc/shells. It also checks if /etc/shells is a plain file and not world writable. OPTIONS This module does not recognise any options. EXAMPLES auth required pam_shells.so AUTHOR pam_shells was written by Erik Troan .