linux中shell變量$#,$@,$0,$1,$2的含義解釋: 變量說明: $$ Shell本身的PID(ProcessID) $! Shell最後運行的後臺Process的PID $? 最後運行的命令的結束代碼(返回值) $- 使用Set命令設定的Flag一覽 $* 所有參數列表。如"$*"用「"」括起來的情況、以"$1 $2 … $n"的形式輸出所有參數。 $@ 所有參數列表。如"$@"用「"」括起來的情況、以"$1" "$2" … "$n" 的形式輸出所有參數。 $# 添加到Shell的參數個數 $0 Shell本身的文件名 $1~$n 添加到Shell的各參數值。$1是第1參數、$2是第2參數…。 |
示例:
1
#!/bin/bash 2
# 3
printf "The
complete list is %s\n" "$$" 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" "$2 |
結果:
[Aric@localhost
~]$ 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 |