Linux shell 变量$#,$@,$0....的含义
1 $#：传入的参数数量
2 $@：传入的参数列表
3 $*：传入的参数
4 $0：Shell本身的文件名
5 $1,$2...：传入的第 i 个参数
6 $?：上一条命令返回的状态码
7 $!：Shell 最后运行的后台 Process 的 PID
8 $$：Shell本身自己的PID
实例
1 #!/bin/bash 2 # 3 printf "The complete list is %s\n" "$$" 4 printf "The complete list is %s\n" "$!" 5 printf "The complete list is %s\n" "$?" 6 printf "The complete list is %s\n" "$*" 7 printf "The complete list is %s\n" "$@" 8 printf "The complete list is %s\n" "$#" 9 printf "The complete list is %s\n" "$0" 10 printf "The complete list is %s\n" "$1" 11 printf "The complete list is %s\n" "$2
结果
1 [Aric@localhost ~]$ bash params.sh 123456 QQ 2 The complete list is 24249 3 The complete list is 4 The complete list is 0 5 The complete list is 123456 QQ 6 The complete list is 123456 7 The complete list is QQ 8 The complete list is 2 9 The complete list is params.sh 10 The complete list is 123456 11 The complete list is QQ
