Other Methods to List Linux Environment Variables

Environment Variables and Shell Variables

Variables are formatted as follows:...

Printing Environment Variables

In order to display environment variables printenv is the most used command that serves the purpose. Only that variable’s value is displayed, if its name is supplied as an argument to the command. printenv prints a list of all environment variables, one variable per line, if no argument is given....

Other Methods to List Linux Environment Variables

The following command will display shell and environment variables using the built-in shell utility declare:-...

Persistent Environment Variables

Environment variables must be defined in the bash configuration files if you want them to be persistent. In most Linux systems, when a new session is launched, environment variables are read from the following files:...

Setting Shell and Environment Variables

Using the name VAR_A and the value Welcome, you can easily create a new shell variable by typing:...

Creating Shell Variables

Let’s start by setting up a shell variable for the active session. To accomplish this, all we need to do is provide a name and a value. We’ll stick to tradition and set the variable to a simple string while maintaining the variable name in all caps....

Creating Environmental Variables

Let’s now convert the shell variable to an environmental variable. Exporting the variable will allow us to achieve this. The appropriate command to do so is named as follows:...

Demoting and Unsetting Variables

We continue to declare our VAR_A variable as an environmental variable. By typing the following, we can turn it back into a shell variable:...

Batch Script of Environment Variables

Following is the batch script of environment variables: PATH, HOME, LANG, and SHELL....