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  • linux中shell变量$#,$@,$0,$1,$2的含义解释

    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 %s " "$$"
     4 printf "The complete list is %s " "$!"
     5 printf "The complete list is %s " "$?"
     6 printf "The complete list is %s " "$*"
     7 printf "The complete list is %s " "$@"
     8 printf "The complete list is %s " "$#"
     9 printf "The complete list is %s " "$0"
    10 printf "The complete list is %s " "$1"
    11 printf "The complete list is %s " "$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
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  • 原文地址:https://www.cnblogs.com/horizonli/p/5256194.html
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