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killall behaves differently between different operating systems, so beware. Check if pkill is available on your OS, as that's likely to be safer. :)

This is akin to asking "how many boxes can I transport on a boat".

It all depends on a lot of factors. What kind of boxes are they? How big are they? What kind of boat are you using to transport...

Yes, the Linux Kernel is preemptive, as are effectively all modern operating systems.

A non-preemptive multitasking operating system essentially requires the cooperation of the programs to tell it...

my $var = sprintf("%.3f", $number);

perldoc -f sprintf

Sorry, no. There is no way to password protect a directory in Linux in the way you describe.

My recommendation is to work towards restricting root access to only those who absolutely need it, and...

Mehdi, I'm going to make one more attempt at trying to resolve your issue. The problem is that I need information in order to diagnose the problem, and I need ALL of the things I listed as bullet...

Please note that doing the above will allow the user to do anything as root. This may not be what you want.

If you wish to restrict access to only certain commands via sudo, you can try to add...

I understand your frustration, but if you wish for me to help you, please refrain from expressing this kind of hostile behaviour.

I'd love to help you, but please do not assume that I know what's...

Please try to clarify the situation.

Do you have two Apache installs (as in two separate complete install in two directories, binaries and all) or do you just have two configuration files?

When...

The OPTIONS variable is there to pass options to the httpd process. Do a man httpd to learn what the various options are. You can not input a command there, as it's not requesting the command to run....