swatch 3.2.4-3 (amd64 binary) in ubuntu focal

 Swatch is designed to monitor system activity. It reads a configuration
 file which contains pattern(s) to look for and action(s) to perform when
 each pattern is found.
 .
 A typical action is echoing the matched line in a variety of colours and
 formats including reverse video, bold, underline, and normal, which swatch
 knows how to do internally. Other actions include sending mail or
 executing an arbitrary program on the line.
 .
 Swatch is written in Perl and uses Perl regular expressions for line
 matching.