iii=0while [ $iii -lt 100 ]         do                iii=$[$iii+1]                echo -n "$iii "        doneiii=0until ! [ $iii -lt 100 ]        do                iii=$[$iii+1]                echo -n "$iii "        doneecho while until num is done while truedo        echo ‘plase input your operate !‘        read BBB        if [ "$BBB" = "out" ]                then break        fidoneecho while until is done for i in root mjorce jorcen normal do         echo i is $i doneecho i si $i ;for f in 123 4123 /etc/profile.d/*.sh do         echo f is $fdonefor i in `seq 1 3` do         echo -n "$i " && sleep 1 done PIDS="`pgrep httpd`"[ -z "$PIDS" ] && echo ‘httpd is not running !‘ && echo exifor i in $PIDS         do                kill -9 $i        doneecho httpd is killed Myfun (){ echo patams1 is $1  echo -n "now i is $i " ! [ "$i" ] && exit ; echo jj  return ‘1‘}myf=$(Myfun);echo myf Myfun 12unset  MyfunMyfunecho ‘the end !‘$myf