: 학교 레포트인데요...주석은 안넣었습니다...
: 틀린곳이 3부분이 있다고 합니다...그리고 각줄에대한 설명을좀
: 부탁드립니다....
: #!/bin/sh
: pause=20
: loopCount=10000
: error=0
: for arg in $*
: do
: 	case $arg in
: 		-t*)
: 			pause=`expr substr $arg 3 10`
: 			;;
: 		-n*)
: 			loopCount=`expr substr $atg 3 10`
: 			;;
: 		*)
: 			user=$arg
: 			;;
: 	esac
: done
: if [ ! "$user" ]
: then
: 	error
: fi
: if [ $error -eq 1 ]
: then
: 	cat << ENDOFERROR
: usage: track [-n#] [-t#] userId
: ENDOFERROR
: 	exit 1
: fi
: trap 'track.cleanip $$; exit $exitCode' 0
: trap 'exitCode=1; exit' 2 3
: echo -n > .track.old.$$
: count=0
: while [ $count -lt $loopCount ]
: do
: 	who | grep $user | sort > .track.new.$$
: 	diff .track.new.$$ .track.old.$$ | sed -f track.sed > .track.report.$$
: 	if [ -s .track.report.$$ ]
: 	then
: 		echo track report for ${user}:
: 		cat .track.report.$$
: 	fi
: 	mv .track.new.$$.track.old.$$
: 	sleep $pause
: 	count=`expr $count + 1`
: done
: exitCode=0