How to 'grep' a continuous stream?

Question

Is that possible to use grep on a continuous stream?

What I mean is sort of a tail -f command, but with grep on t

Answer 1

you may consider this answer as enhancement .. usually I am using

tail -F  | grep --line-buffered   -A 3 -B 5

-F is better in case of file rotate (-f will not work properly if file rotated)

-A and -B is useful to get lines just before and after the pattern occurrence .. these blocks will appeared between dashed line separators

But For me I prefer doing the following

tail -F  | less

this is very useful if you want to search inside streamed logs. I mean go back and forward and look deeply