Redirect only the last line of STDOUT to a file

Question

I\'m compiling Scala code and write the output console output in file. I only want to save the last line of the STDOUT in a file. Here is the command:

scalac         


        

Answer 1

scalac ... | awk 'END{print>>"output.txt"}1'

This will pipe everything through to stdout and append the last line to output.txt.