Advanced Problems

CLI Navigating

Variables

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

1. What is the value of the "HOME" environment variable?
2. How would you create an environment variable named GEEK that's contents are "FREE GEEK is the best!"?

Piping

grep, less, wc, cat, multiple files, lsof, xargs, find, sort, awk

Networking

ifconfig, ping, wget, traceroute

While/For

write, touch

Apt

can we set up a xen instance to let students have root?

• show studnets that they can have root in our current ltsp setup.
• add the ability to have debian livecd over the net - or something like that.

Advanced Syntax

• , --sort, &c.