Hey. Maybe this is no a bug at all due grep rather being focused on text files and 0x0 being special anyway, but just for your information:
$ hd test-with-0x00-and-0x02 00000000 66 6f 6f 0a 62 61 72 0a 7a 65 02 00 0a 62 61 7a |foo.bar.ze...baz| 00000010 0a 7a 65 72 00 0a 65 6e 64 0a |.zer..end.| 0000001a If one now does: $ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-and-0x02 grep: test-with-0x00-and-0x02: binary file matches it matches, presumably only the 0x02, though. Having only 0x00 in the file: $ hd test-with-0x00-only 00000000 66 6f 6f 0a 62 61 72 0a 7a 65 72 00 0a 62 61 7a |foo.bar.zer..baz| 00000010 0a 7a 65 72 00 0a 65 6e 64 0a |.zer..end.| 0000001a doesn’t cause a match: $ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-only $ while naively I'd have assume that 0x00 should be matched as well. Cheers, Chris.
