POSTIN
/bin/sh
if ! grep -q /bin/ksh /etc/shells; then echo "/bin/ksh" >> /etc/shells fi
POSTUN
/bin/sh
if [ ! -f /bin/ksh ]; then perl -ni -e 'm|/bin/ksh| or print' /etc/shells fi
/bin/sh
if ! grep -q /bin/ksh /etc/shells; then echo "/bin/ksh" >> /etc/shells fi
/bin/sh
if [ ! -f /bin/ksh ]; then perl -ni -e 'm|/bin/ksh| or print' /etc/shells fi