Working with BASH environment variables (simple commands for beginners)
You'll learn the following in this tutorial.
- Display names and values of all environment variables
- Assign value to an environment variable
- Print value of a particular environment variable
- Append value to an existing environment variable
- Make the variable globally accessible
- Delete an environment variable
I have tried instructions below on Ubuntu Server but should work for all distributions running the BASH shell.
Display names and values of all environment variables
Assign value to an environment variable
Command above assigns the value "/usr/local/sbin:/usr/local/bin" to the TESTVAR variable.
Print value of a particular environment variable
echo $<variable name>
Command above prints the value of BASH's TESTVAR variable.
Append value to an existing environment variable:
<variable name>=$<variable name>:<new value>
Command above appends "/bin" to the value of BASH's TESTVAR variable.
Make the variable globally accessible:
export <variable name>
Delete an environment variable:
unset <variable name>
Please feel free to use the comments form below if you have any questions or need more explanation on anything. I recommend thoroughy testing on a production-like test system first before moving to production. Use the icons below to share this tutorial with your friends.