shell 练习

shell 练习

iii=
while [ $iii -lt  ]
        do
                iii=$[$iii+]
                echo -n "$iii "
        done

iii=
until ! [ $iii -lt  ]
        do
                iii=$[$iii+]

                echo -n "$iii "
        done

echo while until num is done 

while true
do
        echo 'plase input your operate !'
        read BBB

        if [ "$BBB" = "out" ]
                then break
        fi
done

echo while until is done 

for i in root mjorce jorcen normal
do
        echo i is $i
done

echo i si $i ;

for f in   /etc/profile.d/*.sh
do
        echo f is $f
done

for i in `seq  `
do
        echo -n "$i " && sleep
done 

PIDS="`pgrep httpd`"
[ -z "$PIDS" ] && echo 'httpd is not running !' && echo exi

for i in $PIDS
        do
                kill - $i
        done

echo httpd is killed 

Myfun (){
 echo patams1 is $
 echo -n "now i is $i "
 ! [ "$i" ] && exit ;
 echo jj
 return ''

}

myf=$(Myfun);
echo myf
Myfun 

unset  Myfun

Myfun

echo 'the end !'$myf