| linux中shell变量$#,$@,$0,$1,$2的含义解释: |
| linux中shell变量$#,$@,$0,$1,$2的含义解释: 变量说明: $$ Shell本身的PID（ProcessID） $! Shell最后运行的后台Process的PID $? 最后运行的命令的结束代码（返回值） $- 使用Set命令设定的Flag一览 $* 所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。 $@ 所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。 $# 添加到Shell的参数个数 $0 Shell本身的文件名 $1～$n 添加到Shell的各参数值。$1是第1参数、$2是第2参数…。 |
示例：
1 #!/bin/bash 2 # 3 printf "The complete list is %s\n" "$$" 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" "$2 |
结果：
[Aric@localhost ~]$ 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!!!