$ shutdown -k +1
I love the man page on this one.
-k Don't really shutdown; only send the warning messages to every- body.
Doesn't that sound a bit sinister? I picture an evil System Administrator, having malice aforethought and obvious premeditation, going around executing repeated ``shutdown -k'' commands.
I'm up to 149 tips. I'm a bit of a numbers freak. Tip 23 was special because the numbers PI and E sync on the number 23. So I had to come up with a unique tip for that one.
3.14159265358979323 2.71828182845904523