_=/usr/bin/env Our variable JAVA_HOME is defined on line#2 Define the variable export JAVA_HOME=/usr/bin/java.Let's define an environment variable, list it, and print its value. The basic syntax to define an environment variable is as follows: export VARIABLE_NAME=value bin/bash Printing the environment variable value using echo How to Set Environment Variables in Linux bin/bash Printing the environment variable value using printenvĪnd here's an example of using echo: echo $SHELL Here's an example of printing using printenv: printenv SHELL Let's print the value of the variable SHELL using both methods. There are two ways to print the already defined environment variables: _=/usr/bin/env Output of the env command How to Print Environment Variables in Linux PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin XDG_DATA_DIRS=/usr/local/share:/usr/share:/var/lib/snapd/desktop The command used to display all the environment variables defined for a current session is env. How to List Environment Variables in Linux These environment variables vary based on the current user session. MAIL – This shows the location of where the current user’s mail is stored.LANG – This variable points to the current language/locales settings.SHELL – This stores the path of the current user’s shell, such as bash or zsh.HOME – This shows the home directory of the current user.USER – This points to the currently logged-in user.Here are some examples of environment variables in Linux: You might declare an environment variable only required by your user (for example a secret token) that doesn't need to be exposed to other users. An admin user has a different environment than other users do, for example. For example, each user in an operating system has its own environment. What Are Environment Variables?Įnvironment variables are the variables specific to a certain environment. In this tutorial, I'll teach you what environment variables are and how to set them in Linux. You can edit them, overwrite them, and delete them. Variables can be used repeatedly throughout the code or by your operating system to provide values. In programming, you use variables to store information like strings and numbers temporarily.
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