How to - See the value of all your shell's environment variables using env command
As a linuxer, if you have the slightest experience of working on command line then you would have used environment variables. What’s it really? In short, they act as configuration parameters for applications or programs that we run. Depending upon where we define an environment variable, we can make it available for every application and user (global), only for a single user(local) or just for the shell we are working on(even smaller locality).
Now, since as a shell user, various commands and operations depend on the environment variables, you may want to check if the values are set correctly.
If you are interested in checking the value a single variable then just echo it.
[shredder12]$ echo $VARIABLE
For bulk look up, just type these three magic letters “env”.
[shredder12]$ env | less
“less” because a single page might not be sufficient for the output.