0x00 for循环常规

1. 数字的依次打印

#!/bin/bash

for ((i=1;i<=10;i++));
do 
echo $(expr $i \* 3 + 1);
done

2. 数字用seq生成

#!/bin/bash

for i in $(seq 1 10)
do 
echo $(expr $i \* 3 + 1);
done

3. {1..11} 中括号生成序列

#!/bin/bash

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

4. awk 生成序列

#!/bin/bash

awk 'BEGIN{for(i=1; i<=10; i++) print i}'

0x01 字符循环相关

1. 文件名

#!/bin/bash

for i in `ls`;
do 
echo $i is file name\! ;
done

2. 输入字符，这里用了位置函数

#!/bin/bash

for i in $* ;
do
echo $i is input chart\! ;
done

3. 手动列表

#!/bin/bash

for i in f1 f2 f3 ;
do
echo $i is appoint ;
done

4. for in 变量

#!/bin/bash

list="rootfs usr data data2"
for i in $list;
do
echo $i is appoint ;
done

0x02 路径相关

1. 打印路径

#!/bin/bash

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

2. in变量中引用通配符

#!/bin/bash

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

文章中的例子引用自

https://blog.csdn.net/babyfish13/article/details/52981110