linux中shell变量$#,$@,$0,$1,$2的含义解释

比如脚本名称叫start.sh 输入参数三个: 1 2 3 运行test.sh 1 2 3后 $*为"1 2 3"（一起被引号包住） $@为"1" "2" "3"（分别被包住）

$#为3（参数数量）

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 相关资源：python入门教程(PDF版)