(forgot to CC the bug when email'ing the submitter... shame on me!) When you say that zgrep takes the -R option just fine, do you mean that it actually generates the expected results when recursing down a tree of compressed files, or just that it doesn't complain about including that option? Since the current zgrep is a wrapper that uncompresses the file and then pipes it to grep, I'm not sure how -R could be working. So, in the short term the bug may really be that -R isn't being trapped by the wrapper... in the longer term, there is a proposal afoot to build decompression support in to grep and then zgrep would just be a link to grep, not a wrapper.
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