condition that a file doesn't exist

I know about -e, but how about not existing?

[adni18]

Hi. Is there a condition that checks to make sure a file doesn't exist?

[rocknbil]

if (! -e $file) { print "oops, maybe I should upload it."; }

-e = exists

Or better yet,

if (! -f $file) { print "oops, that's a folder name."; }

-f = is ordinary file

Edit: after a re-read (I hate it when I do that) if you're trying to verify the file's not there, you could just do

if (-f $file) { sleep 1; &check_again; }

[adni18]

Thanks!