Linux下Shell的for循環語句

第一類：數字性循環
-----------------------------
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}'  

第二類：字符性循環
-----------------------------
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  

第三類：路徑查找
-----------------------------
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  

總結：

如今通常都使用for in結構，for in結構後面能夠使用函數來構造範圍，好比$()、``這些，裏面寫一些查找的語法，好比ls test*，那麼遍歷以後就是輸出文件名了。

 

參考：

http://blog.csdn.net/babyfish13/article/details/52981110（以上內容轉自此篇文章）