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10 Handy Commands of Ubuntu / LInux
1. killall < process name >
    To kill a process or application

2. sudo
    To gain super user or root user priveleges

3. wget
    To download files from server

4. mv 
    to move files from one location to other
    if the specified destination does not exist, the actual file will be renamed

5. rm
    to remove files

6. mkdir
    To create directory

7. cd
    To change directory

8. pwd
    To know present working directory

9. ps aux | sort -nrk 4 | head
    To know top 10 processes running sorted by memory occupied

10. ps
      To list all process