基于Shell中for循环的几个常用写法分享

技术  /  管理员 发布于 7年前   224

第一类：数字性循环

for1-1.sh

#!/bin/bash  for((i=1;i<=10;i++)); do  echo $(expr $i \* 3 + 1); done 

for1-2.sh

#!/bin/bash  for i in $(seq 1 10) do  echo $(expr $i \* 3 + 1); done

for1-3.sh

#!/bin/bash  for i in {1..10} do echo $(expr $i \* 3 + 1); done 

for1-4.sh

#!/bin/bash  awk 'BEGIN{for(i=1; i<=10; i++) print i}' 

第二类：字符性循环

for2-1.sh

#!/bin/bash  for i in `ls`; do  echo $i is file name\! ; done 

for2-2.sh

#!/bin/bash  for i in $* ; do echo $i is input chart\! ; done 

for2-3.sh

#!/bin/bash  for i in f1 f2 f3 ; do echo $i is appoint ; done 

for2-4.sh

#!/bin/bash  list="rootfs usr data data2" for i in $list; do echo $i is appoint ; done 

第三类：路径查找

for3-1.sh

#!/bin/bash  for file in /proc/*; do echo $file is file path \! ; done 

for3-2.sh

#!/bin/bash  for file in $(ls *.sh) do echo $file is file path \! ; done 

以上这篇基于Shell中for循环的几个常用写法分享就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。