`ack` has been my goto for grep-likes -- though I would occasionally `ag` for the multi-line support, which ack does not have. My favorite feature of ack that a

`ack` has been my goto for grep-likes -- though I would occasionally `ag` for the multi-line support, which ack does not have. My favorite feature of ack that ag didn't have was the --output flag, which would let you do something like this: $ ack '^(\w+)' --output 'hello $1 world' hello abc world hello defgh world hello etc world But seems like this is equivalent to rg's `-or` flag, so looks like I don't have any reason to not switch over. I love the `-r` flag by itself (short for `--replace`), which seems like a handy replacement for sed's substitution. Also, I've been impressed with how responsive and receptive the author has been on Github. And it doesn't hurt that all of other burntsushi's tools seem solid and well-designed, such as xsv.