Unit Shell Script

#! /usr/bin/ksh #####if loop work###### USAGE="$0 userid" if [[ $# -ne 1 ]] then echo "Proper Usage: $USAGE" exit 1 fi if who | grep $1 > /dev/null then echo "$1 is active" else echo "$1 is not active" fi exit ################################################### #! /usr/bin/ksh #####if loop work###### USAGE="$0 username" if [[ $# -ne 1 ]] then echo "Proper usage: $USAGE" exit 2 fi grep $1 /etc/passwd > /dev/null if [[ $? -eq 0 ]] then echo "$1 is a valid user" exit 0 else echo "$1 is not a valid user" exit 1 fi ################################################### #! /bin/ksh #####if loop work###### if [ $# = 0 ] then echo "Please write your name." elif [ $1 = 'Jin' ] then echo "Jin,please contract me now." else echo "Hello,$1. get out!!!" fi ################################################### #! /bin/ksh #####if loop work###### if test 'whoami'=root then echo Yes, you are root else echo No, you are 'whoami' fi ################################################### #! /bin/ksh #####read command work###### echo "Please enter the file name:" read name if [[ -f $name ]] then rm $name else echo "Error: $name is not an ordinary file"

fi ################################################### #! /bin/ksh #####f loop work###### for var in f1 f2 f3 do wc -l $var done ################################################### #! /bin/ksh #####while loop work###### x=1 while [[ $x -lt 9 ]] do echo "It is now $(date)" echo "There are $(ps -e | wc -l) processes running" echo "There are $(who | wc -l) users logged in" x=$(expr $x + 1) sleep 600 done ################################################### #! /bin/ksh #####while loop work###### count=1 while [ -n "$*" ] do echo "This is parameter no $count $1" shift count=`expr $count+1` done ################################################### #! /bin/ksh echo first parameter entered was $1 echo second parameter entered was $2 echo third parameter entered was $3 echo $# echo $* echo $? echo $0 echo $$ ###################################################