Shell编程 之 for 循环

1. 语法结构

　　   

　　   

2. 案例

　　2.1 批量解压缩

#!/bin/bashcd /root/test/
ls *.tar.gz > ls.log
ls *.tgz >> ls.logfor i in $( cat ls.log )dotar -zxf $i &> /dev/nulldone
rm -rf ls.log
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"for2.sh" 11L, 145C

　　2.2 批量添加指定数量的用户

#!/bin/bashread -p "input username: " -t 30 name
read -p "input total No. of users: " -t 30 num
read -p "input password for users: " -t 30 pswif [ ! -z "$name" -a ! -z "$num" -a ! -z "$psw" ]theny=$( echo $num | sed 's/[0-9]//g' )if [ -z "$y" ]thenfor (( i=1;i<=$num;i=i+1 ))do/usr/sbin/useradd $name$i &> /dev/nullecho $pass | /usr/bin/passwd --stdin $name$i &> /dev/nulldonefi
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"for4.sh" 19L, 422C

　　2.3 批量删除所有的普通用户 

#!/bin/bashusr=$(cat /etc/passwd | grep /bin/bash | grep -v root | cut -d ":" -f1)for i in $usrdouserdel -r $idone~                                                                                  
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"for5.sh" 9L, 127C