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I'm having problems editing a file...

I've just picked up administration duties of a system and am trying to edit a sourced .cshrc file owned by root. Although I su to root, I can't edit the file...

Does anyone know what the double dashes in the following grep line mean?

grep -c -- "->"

The intent of the line is to have a long listing of a directory piped to it, and for it to count off the...