变量说明:
| 变量 | 说明 |
|---|---|
| $$ | Shell本身的PID（ProcessID） |
| $! | Shell最后运行的后台Process的PID |
| $? | 最后运行的命令的结束代码（返回值） |
| $- | 使用Set命令设定的Flag一览 |
| $* | 所有参数列表。如”$*“用「”」括起来的情况、以”$1 $2 … $n”的形式输出所有参数 |
| $@ | 所有参数列表。如”$@”用「”」括起来的情况、以”$1” “$2” … “$n” 的形式输出所有参数 |
| $# | 添加到Shell的参数个数 |
| $0 | Shell本身的文件名 |
| $1 ~ $n | 添加到Shell的各参数值。$1是第1参数、$2是第2参数… |
演示
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#!/bin/bash
printf "The complete list is %s\n" "$$"
printf "The complete list is %s\n" "$!"
printf "The complete list is %s\n" "$?"
printf "The complete list is %s\n" "$*"
printf "The complete list is %s\n" "$@"
printf "The complete list is %s\n" "$#"
printf "The complete list is %s\n" "$0"
printf "The complete list is %s\n" "$1"
printf "The complete list is %s\n" "$2"
输出
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[Wert@localhost ~]$ 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
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