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Using nslookup you can explore domains
nslookup -q=ns youtube.comand hosts
nslookup -q=a youtube.comThe host entry is for convenience. Normally servers are inside the domain; e.g. by convention a...

As explained here : Change your Mac Hostname via Terminal | OSXDaily (http://osxdaily.com/2010/09/06/change-your-mac-hostname-via-terminal/) No.

It won't affect your being able to connect to the internet. It'll just change the name of your machine.

You may want to read this (old) article : Changing your Mac’s Computer Name | OSXDaily...

How about using the -d option? (-e is the default)

This is a wireless interface so this is not on a switched network, it probably has a connection and routes to your corporate switched network, but it's not exclusive. What other wireless devices are...

fork() pre-empts -- just like any and every other system call pre-empts. The calling process is forced to stop during any system call, while the kernel executes instead. This does not mean the new...

A timer. Hardware interrupts are happening all the time which gives a vector for the kernel to regain control without programs cooperatively giving it up. Keyboard or network (as just two examples)...

It's not magic. Looking at bash 4.0's source code, specifically lib/sh/shtty.c:

int
tt_setonechar(ttp)
TTYSTRUCT *ttp;
{
#if defined (TERMIOS_TTY_DRIVER) || defined (TERMIO_TTY_DRIVER)
...