luke@luke-laptop:~$ pwd
/home/luke
luke@luke-laptop:~$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:./:/home/luke/usr/bin
luke@luke-laptop:~$ ls usr/bin
al  autolev  eagle  eagle-5.8.0
luke@luke-laptop:~$ ls usr/bin/autolev/
al  al.exe  toolbox
luke@luke-laptop:~$ ls usr/bin/autolev/toolbox/
alicense.txt  alplot.msg  angvel.a  defaults.al  defaults.al2  dircos.a  GnuplotCopyright.txt  gyrostat.r  help.msg  kindiffs.a  kutta.c  kutta.f  readf.c  solve.c  solve.f  spline.r  warning.msg  writef.c
luke@luke-laptop:~$