Making ps secure

["Steven Adams" <steve@xxxxxxxxxxxxx>]

Hi,
    I am running slackware linux and i notice that on freebsd and some other
distros when u type ps auxf it only outputs the processes your running and
not anyone else..

I was wondering how they made it do this..

Ive also noticed that in a users home dir .bash_history is owned by the
user.. But if the user trys to remove it or chmod it to a diferent setting
it says operation not permitted.

Ive also seen this before
When someone trys a normal ping.

ping: socket: Operation not permitted

How are theses things done and is there a site thats tells u in detail on
how to make your system secure

/Steve

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