### Linux tricks & commands ###
       
       
       * Usefull Linux commands:
        killproc (process)              - Kill the specified process
        df                              - Display free space on mounted disks
        ifup (interface)                - Starts up the specified network interface
        ifdown (interface)              - Shutdown the specified network interface
        cp (from) (to)                  - Copy a file
        rm (file)                       - Remove a file
        rd (dir)                        - Remove directory
        mount                           - Mount a disk
        umount                          - Unmount a disk
        du -bh (directory)              - Show the size of a directory (+ subdirs)