Command History
It is unnecessary to type the same command over and over. The linux bash shell remembers your past commands.These commands are stored in the .bash_history file in each user's home directory.
To use the history, press the up arrow to scroll backward through the commands you have already entered. The [Ctrl]-[R] shortcut searches through your previous commands. Press [Ctrl]-[R] and type the beginning of the command you previously issued. The linux command history stops at the most recent version of that command.
Commands that you only typed partially and did not follow with [Enter] are not saved into your command history file. To clear your command history, type history -c.
By default, RedHat Linux stores 1000 commands. Each terminal window or shell prompt stores a separate set of commands. If you gain root privileges by using the command su -, the history file (and thus the commands) you access are root's, not the user's.
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