On Thu, 30 Apr 2015 07:51:55 +0200, Martin Natano wrote: > grep reads from standard input when no files are specified. It also does > so when -R is used, which doesn't really make sense. I think using the > current working directory as a fallback when no directories are > specified would make sense. POSIX says "If no file operands are > specified, the standard input shall be used.", but -R is an extension > to POSIX, so I guess it is not bound by that.
GNU grep warns in this case before reading from stdin which seems reasonable. % grep -R foo grep: warning: recursive search of stdin ... I'd rather add a warning than change the behavior. - todd
