14.13. Handling a Filename Starting with a Dash (-)
Sometimes you can slip and create a file whose name starts with a dash (-), like -output or -f. That's a perfectly legal filename. The problem is that Unix command options usually start with a dash. If you try to type that filename on a command line, the command might think you're trying to type a command option.
In almost every case, all you need to do is "hide" the dash from the command. Start the filename with ./ (dot slash). This doesn't change anything as far as the command is concerned; ./ just means "look in the current directory" (Section 1.16). So here's how to remove the file -f:
% rm ./-f
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