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浅谈linux中shell变量$#,$@,$0,$1,$2的含义解释

时间:2022-06-30 16:05:04 编辑:袖梨 来源:一聚教程网

摘抄自:ABS_GUIDE

下载地址:http://www.tldp.org/LDP/abs/abs-guide.pdf

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…。

示例:

1 #!/bin/bash
 2 #
 3 printf "The complete list is %sn" "$$"
 4 printf "The complete list is %sn" "$!"
 5 printf "The complete list is %sn" "$?"
 6 printf "The complete list is %sn" "$*"
 7 printf "The complete list is %sn" "$@"
 8 printf "The complete list is %sn" "$#"
 9 printf "The complete list is %sn" "$0"
10 printf "The complete list is %sn" "$1"
11 printf "The complete list is %sn" "$2

结果:

[Aric@localhost ~]$ bash params.sh 123456 QQ
The complete list is 24249
The complete list is
The complete list is 0
The complete list is 123456 QQ
The complete list is 123456
The complete list is QQ
The complete list is 2
The complete list is params.sh
The complete list is 123456
The complete list is QQ
Have a nice day!!!

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