linux命令 export

Linux命令export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命令可以新增、修改或删除环境变量，供后续执行的程序使用。export命令的效力仅限于该次登录操作。 通过export命令可以设置或显示环境变量的值。语法格式为export [-fnp][变量名称]=[变量设置值]。 使用export命令可以自定义命令行前面的显示，例如显示用户名、主机名和shell名称。可以在.bashrc文件中添加export PS1="\u@\h>\s "来实现，需要通过source ~/.bashrc命令使其立即生效。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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