Linux Export: руководство по экспорту данных и файлов в Linux

Linux export

export is a command in Linux that allows you to set or modify environment variables. Environment variables are values used by the operating system to pass information and configuration to programs during their execution. These variables can include environment parameters, file search paths, language and regional settings, and much more.

To use the export command in Linux, you can follow the syntax:

export VARIABLE=value

Here, VARIABLE is the name of the variable you want to set or modify, and value is the value you want to assign to the variable.

Examples:

1. To set an environment variable named MY_VAR with the value "Hello World!", you can execute the following command:

export MY_VAR="Hello World!"

2. If you want to add a new path to the PATH environment variable, you can do the following:

export PATH=$PATH:/new/path

3. If you want to set an environment variable for temporary use only within the current terminal session, you can do the following:

export TMP_VAR="Temporary Value"

When a variable is exported, its value will be available to all subsequent commands and programs executed in that terminal session. It is important to note that variables set with export are only visible within the current terminal session and will not be available to other sessions or after system reboot.

Additionally, you can also use the export command to pass an environment variable from the current terminal session to a child process or script. For example, if you have a script named script.sh that needs to use the environment variable MY_VAR, you can pass it as follows:

In this case, the value of the MY_VAR variable will be available inside the script.sh script.

It is worth noting that variable values can be created or modified interactively or within scripts using the assignment operator (=) and the export command, combined with the variable name and value.

In conclusion, the export command provides a powerful mechanism for managing environment variables in Linux. It allows you to set or modify variable values that will be visible within the current terminal session or passed to child processes and scripts. This command is an important part of the process of configuring and customizing the environment in Linux.