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efaq: Editing files with $ in the name

 
 6.8 How do I edit a file with a ‘$’ in its name?
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 When entering a file name in the minibuffer, Emacs will attempt to
 expand a ‘$’ followed by a word as an environment variable.  To suppress
 this behavior, type ‘$$’ instead.
 

Info Catalog efaq: Emacs ignores frame parameters efaq: Bugs and problems efaq: Shell mode loses the current directory