$ top

While running top, type ‘h’ for a help-overview. Other useful keys:

• u [user name] - display only processes belonging to a specific user. Leave blank to see all users.
• k [process id] - Kill the process with process_id

To kill a process

$ kill -KILL process_id
$ kill -9 process_id

To stop a process

$ kill -STOP process_id

To resume a stopped process

$ kill -CONT process_id

Usage:
uname [-amnrsv]

• -a : All information specified with the -m, -n, -r, -s, and -v options.
• -m : Type of hardware
• -n : Name of the node
• -r : OS release number
• -s : Name of the implementation of the OS
• -v : OS version.

To search a directory recursively for a string, use:

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find . -exec grep "string to find" '{}' \; -print