printer_check

UNIX+shell范例精解（第4版）代码

#!/bin/sh
# Scriptname: printer_check
# Script to clear a hung up printer for SVR4
if [ $LOGNAME != root ]
then
	echo "Must have root privileges to run this program"
	exit 1
fi
cat << EOF
Warning: All jobs in the printer queue will be removed.
Please turn off the printer now. Press Enter when you
are ready to continue. Otherwise press Control-C.
EOF
read ANYTHING      # Wait until the user turns off the printer
echo
/etc/init.d/lp stop       # Stop the printer
rm -f /var/spool/lp/SCHEDLOCK /var/spool/lp/temp*
echo