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This article introduces the relevant knowledge of "how to use export command". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

The export command is a Shell built-in command that is used to set or display environment variables, which include variables and functions. When executing a program in a Shell, the Shell provides a set of environment variables. export adds, deletes, or modifies environment variables for use by programs that are subsequently executed.

How to use Linux export command

You can use export in many ways. A common example is the use of export to set up the user environment. Users can simply specify variables using export and add them to their.profile file. Therefore, every time a user logs in, the environment is configured in this way.

Show all export variables

When used without any arguments, the export command displays a list of all export variables in the environment. You should be able to view the names of variables and their corresponding values.

linuxmi@linuxmi:~$ export

Information about a particular variable can be easily found by using the Linux grep command and the export command. The following command uses a simple example to illustrate this point.

linuxmi@linuxmi:~$ export LINUXMI="Welcome to linuxmi.com"linuxmi@linuxmi:~$ export| grep -i linuxmi2, Display the export variable of the current Shell

The-p flag for export prints a list of all exported variables in the current Linux shell. Take a look at the example below to see what this means.

linuxmi@linuxmi:~$ export -p

You can use this command to troubleshoot various configuration problems with running shell sessions.

3. Export variable under Linux

The export command makes it easy to share variables across environments. You can set the value of a variable using the export statement. The following example demonstrates this.

linuxmi@linuxmi:~$ export EDITOR=/usr/bin/gedit

This sets the path of gedit to the value of the editor variable. You can use grep to confirm this.

linuxmi@linuxmi:~$ export |grep -i EDITOR4, derived functions under Linux

Developers can export functions using the-f option. The following example demonstrates this with a simple test function. You can write custom shell scripts using this method.

linuxmi@linuxmi:~$ test () { echo "Test Function"; }linuxmi@ linuxmi:~$ export -f testlinuxmi@linuxmi:~$ bashTest Functiondircolors: /home/linuxmi/.dircolors: no file or directory linuxmi@linuxmi:~$testFunction

This should display the string " Test Function " in the terminal window. bash call is used to spawn a child process for bash. Otherwise, the test function will not print text.

5. Configure environment attributes

Under Linux operating systems, you can configure various environment parameters using the export command. For example, if you add the following line to your.bashrc file, it will set it to Snap's path every time the system restarts.

linuxmi@linuxmi:~$ echo export PATH="/snap/bin/lxd:$PATH" >> .bashrc

If you're unfamiliar with how profiles work inside, don't worry. Simply add custom exports at the end of the file. That way, you can always find and delete them if you want.

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