for循环

输出a到z

for i in {a..z}

do

    echo $i

done

 

把ls /root的文件一个一个地输出：

[root@u ~]# cat 11.sh

for i in `ls /root`

do

    echo $i

done

[root@u ~]#

 

&> /dev/dull中&>意思是把左边输出的结果，都放到/dev/dull文件中

[root@u ~]# cat 12.sh

for i in {1..253}

do

    ping -c1 192.168.88.$i &> /dev/dull

    if [ $? -ne 0  ]

    then

        echo "192.168.88.$i is available."

    fi

done

[root@u ~]#

 

echo "192.168.88.$i is available." >> /root/ip.txt意思是把可用的IP放到文件ip.txt中

[root@u ~]# cat 12.sh

for i in {1..253}

do

    ping -c1 192.168.88.$i &> /dev/dull

    if [ $? -ne 0  ]

    then

        echo "192.168.88.$i is available." >> /root/ip.txt

#    else

#        echo "192.168.88.$i is unavailable."

    fi

done

[root@u ~]#

 

 

case 语法python没有,其他有

 

[root@u ~]# cat 13.sh

read -p 'input you name:' name

case $name in

root)

echo "welcome $name"

;;

seker)

echo "welcome $name"

;;

default)

echo "welcome $name"

;;

*)

echo "no $name "

esac

[root@u ~]#