Re: some Linux commands

HL wrote:

>Not familiar with Linux commands.
>
>What kind of commands to use in order  to find out who, when and what they
>did under Linux server ?
>How to find out passwords issued for some accounts by previous system
>administrator ?
>

For finding out who is or has been logged in you can use (among others) 
the following commands:

who
w
last

use the manpages (man <command>) for extra info on these commands.

It's impossible to retrieve stored password for security reasons, even 
to root. As root it is possible though to change passwords, with the 
passwd command.

Greets,
Eric.