Grep date with regex

Wow, I was so close ... single quotes:

$ ack-grep '\> \\'

Figured this out after confirming that my regex match was valid using: http://regexpal.com/ and just happened to have had single quotes from trying something else.

Don't use cat for that. Instead use grep DATABASE * or grep -n DATABASE * (if you want to know the line numbers as well as the filenames) directly.

See useless use of cat.

To clarify a bit more: cat * actually concatenates all files as it feeds them to grep through the pipe, so grep has no way of knowing which content belongs to which file, and indeed can't even really know if it's scanning files or you're just typing mighty fast. It's all one big standard input stream once you use a pipe.

Lastly, -H is redundant almost for sure as grep prints the filename by default when it's got more than one file to search. It could be of some use in case you want to parse the output, though, as there's some possibility the * glob will expand to a single file and grep would in that case omit the filename.