linux shell for

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  

总结：

现在一般都使用for in结构，for in结构后面可以使用函数来构造范围，比如$()、``这些，里面写一些查找的语法，比如ls test*，那么遍历之后就是输出文件名了。

参考：

http://blog.youkuaiyun.com/babyfish13/article/details/52981110（以上内容转自此篇文章）

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