1 #!/bin/sh 2 3 flag='' 4 if [ "x$1" = "x-a" ] 5 then 6 flag=-a 7 shift 8 fi 9 10 user=`whoami` 11 case $# in 12 0) 13 user=`whoami` 14 ;; 15 1) 16 user=$1 17 ;; 18 *) 19 echo 'usage: psu [-a] [user]' 1>&2 20 exit 1 21 esac 22 23 ps $flag | grep "^$user "