Linux cli pipeline command tail and grep

Question

I am using tail to monitor a log file and using grep to filer the keyword.

tail -F somefile.log | grep "keyword" is working tail -F somefile.log | awk '{print $4}' is working

but if to put them together is not working, like tail -F somefile.log | grep "keyword" | awk '{print $4}'

Is this the wrong way to use |? How to make tail -F somefile.log | grep "keyword" | awk '{print $4}' to work? Thanks

if I want to run a command after awk like tail -F somefile.log | grep "keyword" | awk '{print $4}' | ./abashfile.sh how to achieve something like this, looks like multiple | is not quite right for combining everything in 1 line. Thanks

Answer 1

You can do it with awk alone:

tail -f somefile.log | awk '/keyword/ {print $4}'