导出 PATH 在 linux 上的 bash shell 中不起作用
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exporting PATH not working in a bash shell on linux
提问by Yet A-beyene
For example, I type to the following command:
例如，我输入以下命令：
# PATH=$PATH:/var/test
# echo $PATH
........./var/test // working
# export PATH
Next, I open another bash shell session to test if the export works by typing the following command:
接下来，我打开另一个 bash shell 会话，通过键入以下命令来测试导出是否有效：
# echo $PATH
........ // not working as in I don't see /var/test path
回答by riteshtch
you have set the PATHenvironment variable only for your current bashsession. You need to add the line PATH=$PATH:/var/testinto ~/.bashrcso that it works for any bashshell.
您PATH仅为当前bash会话设置了环境变量。您需要将该行添加PATH=$PATH:/var/test到其中，~/.bashrc以便它适用于任何bashshell。
Just run the following command to put it into your rc(run commands) file (rc files contain startup information for a command(initialization)):echo "PATH=$PATH:/var/test" >> ~/.bashrc
只需运行以下命令将其放入您的rc（运行命令）文件（rc 文件包含命令的启动信息（初始化））：echo "PATH=$PATH:/var/test" >> ~/.bashrc
More info: https://en.wikipedia.org/wiki/Run_commands
https://superuser.com/questions/789448/choosing-between-bashrc-profile-bash-profile-etc
更多信息：https: //en.wikipedia.org/wiki/Run_commands
https://superuser.com/questions/789448/choosing-between-bashrc-profile-bash-profile-etc
exporting a variable makes it available only in child processes spwaned/started from that bash shell.
As an example:
export使用一个变量使其仅在从该 bash shell 衍生/启动的子进程中可用。
举个例子：
$ export var=abcd
$ sh
$ echo "$var"
abcd
$ exit
$ echo "$var"
abcd
$
shis the child process of bashhence it gets the value of var, since you open a new bashwhich is a different process altogether it does get the PATHvalue.
sh是 的子进程，bash因此它获得 的价值var，因为您打开一个新的bash，这是一个完全不同的过程，它确实获得了PATH价值。
