[gnicholas]

I so often type "nevermind" instead of "never mind" that I created a shortcut on my computer that replaces the former with the latter. I have met many other people of my generation (early 40s) who also thought it was a single word. I think we were influenced by the popular Nirvana album, which used the single-word spelling.

[Beltalowda]

If enough people spell something "wrong" it automatically becomes the correct (or rather, standard) spelling, and words can have more than one correct spelling, too.

[gnicholas]

True! I've checked the dictionary several times, and we've apparently not hit the tipping point yet.

[zerocrates]

Clearly you needed to be born a little earlier so you could instead have been influenced by the proper diction of Never Mind the Bollocks, Here's the Sex Pistols.

[johncs]

Ah of course you meant in a word processor...

    $ never mind
    -bash: never: command not found

Thought I was about to learn about a new utility for a moment.

[Kaze404]

Welp, I also just learned it's not a single word.