added the copytruncate option. it works this way:

Truncate the original log file to zero size in place after creating a copy,
instead of moving the old log file and optionally creating a new one.
It can be used  when some program cannot be told to close its logfile
and thus might continue writing (appending) to the previous log file forever.
Note that there is a very small time slice between copying the file and
truncating it, so some logging data might be lost. When this option is used,
the create option will have no effect, as the old log file stays in place.
$scriptname is not used in redirectlog.src.sh, so the exist check is removed
added some needed variable checks to redirectlog.src.sh
two variable checks were unnecessary, removed them
readme added