Wow, after 25 years of Unix experience, I learned that you can filter output in #less.

Press ampersand (&) and enter a regex to show only lines matching the regex.

Press ampersand (&) and then exclamation mark (!) to apply an inverse filter.

@_xhr_ I ususally use grep to filter text streams, but when I don't, it's because I want to see the surrounding non-matching lines, so slash search (/) in less is much more useful to me
@wolf480pl @_xhr_ I think it was the '-C n' parameter that told grep to output n lines before and after a match
@AndreasEK @_xhr_ yes, but that requires knowing ahead if time how many lines you need. Which you usually don't know when looking through logs for a problrm that you're seeing for the first time.