请教$CONNECT "$@"里的"$@"是什么意思?

chinlone

$CONNECT "$@" > /dev/null 2>&1 &
CONNECT_PID=$! 这个"$@"和"$!"是什么意思呀?

deathcult

1. 
   
2. @      
   
3. Expands to the positional parameters, starting from one.  When
   
4. the expansion occurs within double-quotes, each positional param-
   
5. eter expands as a separate argument.  If there are no positional
   
6. parameters, the expansion of @ generates zero arguments, even
   
7. when @ is double-quoted.  What this basically means, for example,
   
8. is if $1 is ``abc'' and $2 is ``def ghi'', then "$@" expands to
   
9. the two arguments:
   
10. 
    
11.                    "abc"   "def ghi"
    
12. 
    
13. !      
    
14. Expands to the process ID of the most recent background command executed from the current shell.  For a pipeline, the process ID is that of the last command in the pipeline.
    
15. 
    

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masher

[ 特定s h e l l变量 ]
$# 传递到脚本的参数个数
$* 以一个单字符串显示所有向脚本传递的参数。与位置变量不同，此选项参数可超过9个
$$ 脚本运行的当前进程I D号
$! 后台运行的最后一个进程的进程I D号
$@ 与$ #相同，但是使用时加引号，并在引号中返回每个参数
$- 显示s h e l l使用的当前选项，与s e t命令功能相同
$? 显示最后命令的退出状态。0表示没有错误，其他任何值表明有错误。