idcheck

UNIX+shell范例精解（第4版）代码

#!/bin/sh
# Scriptname: idcheck
# purpose:check user ID to see if user is root.
# Only root has a uid of 0.
# Format for id output:uid=9496(ellie) gid=40 groups=40
# root's uid=0 

id=`id | nawk -F'[=(]'  '{print $2}'`     # Get user ID
echo your user id is: $id
if [ $id -eq 0 ]
then 
	echo "you are superuser."
else
	echo "you are not superuser."
fi