When I check on my system's environment, a lot of environmental variables will pop up. How can I just search for a particular variable?A book I'm reading says:Sometimes the number of variables in your environment grows quite  large, so much so that you don't want to see all of the values  displayed when you are interested in just one. If this is the case,  you can use the echo command to show an environment variable's current  value.How do I do this in a Linux terminal?
How to show an environment variable's current value?
command line;environment variables
Just:echo $VARIABLENAMEFor example for the environment variable $HOME, use:echo $HOMEWhich then prints something similar to:/home/usernameEdit: according to the comment of Stphane Chazelas, it may be better if you use printenv instead of echo:printenv HOME