Unix HELP!!

Just learning Unix and here are some questions that I need to know!

What does uname command show?

information on the currently used unix OS

information on the user

information on administrator of the Unix OS

information on the user group

What does "ps" stand for in Unix?

proliferating subtasks

pause the current state of command

postscript

process status

What does the top command do?

Shows the free disk spaces

Shows the sizes of the largest allocated memory blocks

Shows the currently longest processing times

Shows the real-time statuses of all or selected processes

What is .bash_history?

A command to show the user's command history

A file to include the command history in the last 6 months

A file including the user's command history during the last or current login

A command to show the user group's command history