The variable is set within the subshell but unset outside.

yjh777

注意：管道后的命令是在subshell中执行的

1. 
   
2. #!/bin/sh
   
3. # readpipe.sh
   
4. # This example contributed by BjonEriksson.
   
5. OIFS=$IFS; IFS=
   
6. 
   
7. last="(null)"
   
8. cat $0 |
   
9. while read -r line
   
10. do
    
11.          echo "{$line}"
    
12.          last=$line
    
13. done
    
14. printf "\nAll done, last:$last\n\n"
    
15. 
    
16. exit 0  # End of code.
    
17.          # (Partial) output of script follows.
    
18.          # The 'echo' supplies extra brackets.
    
19. IFS=$OFS
    
20. #############################################
    

复制代码

[root@142 work]# sh kkk1.sh
{#!/bin/sh}
{#readpipe.sh}
{#This example contributed by BjonEriksson.}
{OIFS=$IFS; IFS=}
{}
{last="(null)"}
{cat $0 |}
{while read -r line}
{do}
{       echo "{$line}"}
{       last=$line}
{done}
{printf "\nAll done, lastlast\n\n"}
{}
{exit 0 # End of code.}
{       # (Partial) output of script follows.}
{       # The 'echo' supplies extra brackets.}
{IFS=$OFS}
{#############################################}

All done, lastnull)

[root@142 work]#

The variable (last) is set within the subshell but unset outside.

[ 本帖最后由 yjh777 于 2006-6-7 17:21 编辑 ]

waker

?

yjh777

原帖由 waker 于 2006-6-7 17:00 发表
?

不好意思，，刚才翻资料看到这个例子，觉得不错，就贴出来给大家看看。。