read log file lines that have not been read

 pygtail is a tool for reading log files, and is capable of handling log files
 which are rotated.
 .
 This has similar functionality to the logtail2 tool (which can be found in the
 logtail package).
 .
 This package contains the command line tool, pygtail. See the python3-pygtail
 package for the library that this tool uses.