[转]linux下各种形式的shell加法操作总结

linux 下shell加法操作总结：

#!/bin/bash

 

n=1;echo -n "$n "

 

let "n = $n + 1"

echo -n "$n "

 

: $((n = $n + 1))

echo -n "$n "

 

(( n = n +1 ))

echo -n "$n "

 

: $[ n = $n +1 ]

echo -n "$n "

 

n=$[ $n + 1 ]

echo -n "$n "

 

let "n++"

echo -n "$n "

 

(( n++ ))

echo -n "$n "

 

: $[ n++ ]

echo -n "$n "

 

echo

 

运行结果：1 2 3 4 5 6 7 8 9

 

原文 http://blog.sina.com.cn/s/blog_6797a6700101em09.html