if

if [ 1 -gt 2 ]

then

        echo '1 > 2'

else

        echo '1 <= 2'

fi

 

 

if [ 1 -gt 2 ]

then

        echo '1 > 2'

elif [ 1 = 2 ]

then

        echo '1 = 2'

else

        echo '1 < 2'

fi

 

case

case $1 in

y)

        echo 'yes'

        ;;

Y)

        echo 'yes'

        ;;

n)

        echo 'no'

        ;;

N)

        echo 'no'

        ;;

esac

 

 

for

for name in zhangsan lisi wangwu

do

        echo $name

done

 

 

while

i=0

while [ $i -lt 10 ]

do

        echo $i

        i=`expr $i + 1`

done