shell 练习

 

shell 练习

iii=0
while [ $iii -lt 100 ] 
        do
                iii=$[$iii+1]
                echo -n "$iii "
        done

iii=0
until ! [ $iii -lt 100 ]
        do
                iii=$[$iii+1]

                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 123 4123 /etc/profile.d/*.sh 
do 
        echo f is $f
done




for i in `seq 1 3` 
do 
        echo -n "$i " && sleep 1 
done 




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

for i in $PIDS 
        do
                kill -9 $i
        done

echo 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 12


unset  Myfun


Myfun

echo 'the end !'$myf