758
tar -vczfx123 ought to do it
(imgs.xkcd.com)
img title="I don't know what's worse--the fact that after 15 years of using tar I still can't keep the flags straight, or that after 15 years of technological advancement I'm still mucking with tar flags that were 15 years old when I started."
The command that I can never get right the first time is
ln. I always end up creating a dead link inside my target folder, even when I read the man page directly prior.