Need help with 'cut' alternative

[Reed Loefgren]

I'm using "cut" to get lines of a file into another file. But cut,
much like a word processor's "copy", leaves a copy of that cut line in
the original file. Is there a bash command that *moves* the cut line
to the new file, without leaving that line in the original? A true
"cut", and not a "copy."

Thanks for the pointers,

rl