linux之while循环

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[root@localhost rootCodeFiles]# cat while_test.sh #!/bin/shnum=1while [ $num -le 10  ]do        SUM=`expr $num \* $num`        echo $SUM        num=`expr $num + 1`done[root@localhost rootCodeFiles]#

[root@localhost rootCodeFiles]# cat user_add.sh #!/bin/sh#批量添加用户echo "please input username"read usernameecho "please input num"read num# /etc/passwd  添加用户名i=1while [ $i -le $num ]do        /usr/sbin/useradd $username$i        i=`expr $i + 1`done# /etc/shadow 给用户设置密码echo "please input password"read passwdj=1while [ $j -le $num ]do        echo $passwd | /usr/bin/passwd --stdin $name$j > /dev/null        j=`expr $j + 1`done [root@localhost rootCodeFiles]#

[root@localhost rootCodeFiles]# cat user_delete.sh #!/bin/shecho "please input username"read usernameecho "please input number of user you wanna delete"read numsum=1while [ $sum -le $num ]do        /usr/sbin/userdel -r $username$sum        sum=`expr $sum + 1`done[root@localhost rootCodeFiles]#

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