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
   8. tcpdump
   9. ping
   10. igup/ifdown
   11. nslookup
   12. finger
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
   10. du
5. Diagnostic related
   1. lspci -v
   2. top
6. System related
   1. df -H
   2. watch
   3. vmstst
   4. w
   5. uptime
   6. free
   7. last
   8. shutdwn
   9. uname
7. GUI
   1. zenity
   2. dialog
   3. notify-send