Shell中for循环的几个常用写法

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原文链接：https://blog.csdn.net/babyfish13/article/details/52981110

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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

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