Difference between revisions of "CLI Variables"
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=== Quiz === | === Quiz === | ||
| + | # What is the value of the "USER" environment variable? | ||
| + | # What is the value of the "HOSTNAME" environment variable? | ||
| + | # What is the value of the "PWD" environment variable? | ||
# What is the value of the "HOME" environment variable? | # What is the value of the "HOME" environment variable? | ||
# How would you create an environment variable named GEEK that has the contents- "FREE GEEK is the best!"? | # How would you create an environment variable named GEEK that has the contents- "FREE GEEK is the best!"? | ||
# Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"? | # Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"? | ||
| + | # Can you tab-complete environment variables? | ||
[[Category:CLI Quizes]] | [[Category:CLI Quizes]] | ||
[[Category:Classes]] | [[Category:Classes]] | ||
Revision as of 12:51, 19 April 2008
Assignment and Dereferencing
To assign a value to an environment variable you simply type the variable name, '=', then the value. For example,
FOO=Rob BAR=Love
To get the value of the variable (i.e. dereference) you place a '$' before the variable name.
#echo $FOO #Rob #echo $BAR #Love
Commands
env = Shows you the environment variables that are currently defined. echo = Displays a line of text.
Quiz
- What is the value of the "USER" environment variable?
- What is the value of the "HOSTNAME" environment variable?
- What is the value of the "PWD" environment variable?
- What is the value of the "HOME" environment variable?
- How would you create an environment variable named GEEK that has the contents- "FREE GEEK is the best!"?
- Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"?
- Can you tab-complete environment variables?