POSTIN

/bin/sh

if [ ! -f /etc/shells ]; then
	echo "/bin/tcsh" > /etc/shells
	echo "/bin/csh" > /etc/shells
else
	grep '^/bin/tcsh$' /etc/shells > /dev/null || echo "/bin/tcsh" >> /etc/shells
	grep '^/bin/csh$' /etc/shells > /dev/null || echo "/bin/csh" >> /etc/shells
fi

POSTUN

/bin/sh

if [ ! -x /bin/tcsh ]; then
	grep -v '^/bin/tcsh$' /etc/shells | grep -v '^/bin/csh$'> /etc/shells.rpm
	mv /etc/shells.rpm /etc/shells
fi