Hello:

I modified the file "/etc/inittab" such that the number of getty process
becomes 1.

If I delete all the getty process, what will happen?
Actually, what's the use of this process?

Thanks.

The getty processes configured by the entries in /etc/inittab create pseudoterminal sessions that you can access by pressing <CTRL><ALT><F#>, where <F#> is one of your <F1>-<F6> keys.

This can be useful in many ways. It is a quick way to access a terminal session, or a way to get a logon prompt when something bad is happening to your X session. I personally use it to turn my local linux box into a KVM switch by launching multiple XDMCP sessions to different remote unix boxes by invoking from each of the terminal sessions:
X :# -query <hostname>
where # in #th X session I am launching.

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getty = Get TTY. This is from the original days of Unix back in the late 60's. Each getty is just a process waiting for some form of communications input on the port it has been assigned to.

Whatever you do DON'T kill all of the gettys. leave at least one.

As mentioned by IDAHO it gives you multi user logins.

Cheers

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