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  • Linux export命令


    |--Linux export命令

    Linux export命令用于设置或显示环境变量。
    在shell中执行程序时,shell会提供一组环境变量。
    export可新增,修改或删除环境变量,供后续执行的程序使用。
    export的效果仅作用于该次登陆操作。


    |--语法

    export [-fnp][变量名称]=[变量设置值]

    参数说明:

    -f  代表[变量名称]中为函数名称。
    -n  删除指定的变量。变量实际上并未删除,只是不会输出到后续指令的执行环境中。
    -p  列出所有的shell赋予程序的环境变量。


    |--实例
      |--列出当前所有的环境变量

    # export -p //列出当前的环境变量值
    declare -x HOME="/root"
    declare -x LANG="zh_CN.UTF-8"
    declare -x LANGUAGE="zh_CN:zh"
    declare -x LESSCLOSE="/usr/bin/lesspipe %s %s"
    declare -x LESSOPEN="| /usr/bin/lesspipe %s"
    declare -x LOGNAME="root"
    declare -x LS_COLORS=""
    declare -x MAIL="/var/mail/root"
    declare -x OLDPWD
    declare -x PATH="/opt/toolchains/arm920t-eabi/bin:/opt/toolchains/arm920t-eabi/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
    declare -x PWD="/root"
    declare -x SHELL="/bin/bash"
    declare -x SHLVL="1"
    declare -x SPEECHD_PORT="6560"
    declare -x SSH_CLIENT="192.168.1.65 1674 22"
    declare -x SSH_CONNECTION="192.168.1.65 1674 192.168.1.3 22"
    declare -x SSH_TTY="/dev/pts/2"
    declare -x TERM="XTERM"
    declare -x USER="root"
    declare -x XDG_SESSION_COOKIE="93b5d3d03e032c0cf892a4474bebda9f-1273864738.954257-340206484"

    |--定义环境变量

    # export MYENV //定义环境变量
    # export -p //列出当前的环境变量
    declare -x HOME="/root"
    declare -x LANG="zh_CN.UTF-8"
    declare -x LANGUAGE="zh_CN:zh"
    declare -x LESSCLOSE="/usr/bin/lesspipe %s %s"
    declare -x LESSOPEN="| /usr/bin/lesspipe %s"
    declare -x LOGNAME="root"
    declare -x LS_COLORS=""
    declare -x MAIL="/var/mail/root"
    declare -x MYENV
    declare -x OLDPWD
    declare -x PATH="/opt/toolchains/arm920t-eabi/bin:/opt/toolchains/arm920t-eabi/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
    declare -x PWD="/root"
    declare -x SHELL="/bin/bash"
    declare -x SHLVL="1"
    declare -x SPEECHD_PORT="6560"
    declare -x SSH_CLIENT="192.168.1.65 1674 22"
    declare -x SSH_CONNECTION="192.168.1.65 1674 192.168.1.3 22"
    declare -x SSH_TTY="/dev/pts/2"
    declare -x TERM="XTERM"
    declare -x USER="root"
    declare -x XDG_SESSION_COOKIE="93b5d3d03e032c0cf892a4474bebda9f-1273864738.954257-340206484"


    |--定义环境变量赋值

    # export MYENV=7 //定义环境变量并赋值
    # export -p
    declare -x HOME="/root"
    declare -x LANG="zh_CN.UTF-8"
    declare -x LANGUAGE="zh_CN:zh"
    declare -x LESSCLOSE="/usr/bin/lesspipe %s %s"
    declare -x LESSOPEN="| /usr/bin/lesspipe %s"
    declare -x LOGNAME="root"
    declare -x LS_COLORS=""
    declare -x MAIL="/var/mail/root"
    declare -x MYENV="7"
    declare -x OLDPWD
    declare -x PATH="/opt/toolchains/arm920t-eabi/bin:/opt/toolchains/arm920t-eabi/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
    declare -x PWD="/root"
    declare -x SHELL="/bin/bash"
    declare -x SHLVL="1"
    declare -x SPEECHD_PORT="6560"
    declare -x SSH_CLIENT="192.168.1.65 1674 22"
    declare -x SSH_CONNECTION="192.168.1.65 1674 192.168.1.3 22"
    declare -x SSH_TTY="/dev/pts/2"
    declare -x TERM="XTERM"
    declare -x USER="root"
    declare -x XDG_SESSION_COOKIE="93b5d3d03e032c0cf892a4474bebda9f-1273864738.954257-340206484"

     

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  • 原文地址:https://www.cnblogs.com/xzpin/p/11072563.html
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