CLI Variables

Commands

env  = Shows you the environment variables that are currently defined.
echo = Displays a line of text.

Examples

Example #1 - Assignment

To assign a value to an environment variable you simply type the variable name, '=', then the value. For example,

FOO=Rob
BAR=Love

Example #2 - Derefrencing

To get the value of the variable (i.e. dereference) you place a '$' before the variable name.

#echo $FOO
#Rob
#echo $BAR
#Love

Quiz

1. What is the value of the "USER" environment variable?
2. What is the value of the "HOSTNAME" environment variable?
3. What is the value of the "PWD" environment variable?
4. What is the value of the "HOME" environment variable?
5. How would you create an environment variable named GEEK that has the contents- "FREE GEEK is the best!"?
6. Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"?
7. Can you tab-complete environment variables?

Instructor Notes

There needs to be a little into paragraph and the examples could be flushed out more.