![]() There are several environment variables that are considered standard. You can use the env command to print or set the values of environment variables. The command should print each environment variable passed in one line. usr /local /bin: /usr /bin: /bin: /usr /local /games: /usr /games If you run this command with no arguments, it will print all environment variables, as seen in the example below: The most popular way to view environment variables is through the printenv command. We can use various commands to view these variables. How to Print Environment Variablesĭifferent Linux shells maintain a list of predefined shell and environment variables. The variables in each shell are different, for example, Bash has a different set of variables than ZSH. They are commonly used to store temporary data and are automatically destroyed once the shell session is terminated. Shell variables are variables that are available within the shell in which they are defined or set. You should not include spaces around the equal sign.Įnvironment variables are inherited by all shells and their corresponding child processes. It is recommended to use UPPERCASE names for environment variables to distinguish them from other variables within different contexts. zlogin, etc.Įnvironment variables are used to store system-related settings that can be accessed by the shell.Įnvironment variables take the following format: This information is gathered from configuration files such as. When we launch a new shell session in Linux or other Unix-based systems, a process is initialized to gather information that should be available within that shell session and all its child processes. Let's take a moment to understand how environment variables work. This guide will discuss how to read and set environment variables using the ZSH shell. You can change the values of environment variables, which will be reflected in all applications launched from the shell. Environment variables are a set of dynamic variable names that store a value that applications from the Linux shell can use.Įnvironment variables are key-value pairs where the key is the name of the variable and the value is what the key represents. If you've ever used the Linux terminal, you're probably aware of environment variables.
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