1. Basic Command
   1. cd
   2. ll
   3. ls
   4. rmdir/mkdir
   5. rm
2. Network Command
   1. ssh
      1. X
   2. traceroute
   3. scp
   4. ifconfic
   5. netstat
   6. rsync
   7. who
3. process related
   1. ps
      1. aux
   2. kill
      1. all
      2. ag
   3. fg PID
4. Data & file manipulation
   1. awk
   2. grep
   3. ll
   4. ls
   5. find
   6. touch
   7. cat
   8. tar
   9. zip
5. Diagnostic related
   1. lspci -v
   2. Subtopic 2
6. System related
   1. df -H
   2. watch
7. GUI
   1. zenity
   2. dialog
   3. notify-send