基于Shell中for循环的几个常用写法分享

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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