zoukankan      html  css  js  c++  java
  • Linux中shell变量$0,$?等含义

    linux中shell变量$#,$@,$0,$1,$2的基本含义: 
    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…。

    实例:

    $ vim dollar.sh

    #!/bin/bash printf "The complete list is %s " "$$" printf "The complete list is %s " "$!" printf "The complete list is %s " "$?" printf "The complete list is %s " "$*" printf "The complete list is %s " "$@" printf "The complete list is %s " "$#" printf "The complete list is %s " "$0" printf "The complete list is %s " "$1" printf "The complete list is %s " "$2" printf "The complete list is %s " "$3"

    结果展示:

    [sunny@xxxx ]$ sh dollar.sh 123456 654321 qq ww
    The complete list is 3278
    The complete list is 
    The complete list is 0
    The complete list is 123456 654321 qq ww
    The complete list is 123456
    The complete list is 654321
    The complete list is qq
    The complete list is ww
    The complete list is 4
    The complete list is dollar.sh
    The complete list is 123456
    The complete list is 654321
    The complete list is qq
  • 相关阅读:
    uboot——官网下载直接移植(二)
    uboot——官网下载直接移植(一)
    uboot移植——使用三星移植好的uboot开始移植
    ubuntu 网络设置
    s5pv210 uboot——移植DM9000网卡驱动
    UBOOT——MMC驱动分析
    UBOOT——启动内核
    (转)C语言——字符常量
    UBOOT——第二阶段start_armboot函数详解(二)
    RandomForest in Spark MLLib
  • 原文地址:https://www.cnblogs.com/coffy/p/5740396.html
Copyright © 2011-2022 走看看