linux中shell变量$#,$@,$0,$1,$2的含义
#!/bin/bash
#Created by ley on 2014-11-14
#Testing the Paramters
echo "The compleate list is %s\n" "$$"
echo "The compleate list is %s\n" "$!"
echo "The compleate list is %s\n" "$?"
echo "The compleate list is %s\n" "$*"
echo "The compleate list is %s\n" "$@"
echo "The compleate list is %s\n" "$#"
echo "The compleate list is %s\n" "$0"
echo "The compleate list is %s\n" "$1"
echo "The compleate list is %s\n" "$2"
linux中shell变量$#,$@,$0,$1,$2的含义解释:
变量说明:
$$
Shell本身的PID(ProcessID)
$!
Shell最后运行的后台Process的PID
$?
最后运行的命令的结束代码(返回值)
$-
使用Set命令设定的Flag一览
$*
所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。
$@
所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。
$#
添加到Shell的参数个数
$0
Shell本身的文件名
$1~$n
添加到Shell的各参数值。$1是第1参数、$2是第2参数…。
[root@localhost ~]# ./params.sh 123456 QQ
The compleate list is %s\n 3406
The compleate list is %s\n
The compleate list is %s\n 0
The compleate list is %s\n 123456 QQ
The compleate list is %s\n 123456 QQ
The compleate list is %s\n 2
The compleate list is %s\n ./params.sh
The compleate list is %s\n 123456
The compleate list is %s\n QQ
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