shell循环

#!/bin/bash 
# c style
for((i=1;i<=10;i++));  
do   
echo $(expr $i \* 3 + 1);  
done 

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

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

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

# string loop
for i in `ls`;  
do   
echo $i is file name;  
done

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

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

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

# path loop
for file in /proc/*;  
do  
echo $file is file path;  
done 

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