Linux下Shell的for循环语句

第一类：数字性循环
-----------------------------
for1-1.sh

#!/bin/bash  

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

-----------------------------
for1-2.sh

#!/bin/bash  

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

-----------------------------
for1-3.sh

#!/bin/bash  

for i in {..}
do
echo $(expr $i \*  + );
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.csdn.net/babyfish13/article/details/52981110（以上内容转自此篇文章）