Command line class redesigned

2 hour class (simply not enough time otherwise)

topics covered (initial list taken from ticket 15108):
 * top
 * modprobe
 * linux filesystem structure
 * /proc
 * grub
 * grep
 * basic piping and redirection ( |, >, >>, etc.)
 * lspci
 * ifconfig / iwconfig
 * apt-get install
 * bat_check and wc bat-time (part of the normal build/qc process)
 * using gedit or nano or whatever text editor is necessary
 * changing permissions
 * groups

Please add to this list. I will also add or remove as seems appropriate after discussion with others. A major question is how much to deal with the absolute beginner stuff.