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terminal1 $ touch /tmp/my.log
terminal2 $ perl script.pl -p . /tmp/my.log | less +F
terminal1 $ echo "lala" >> /tmp/my.log
terminal1 $ echo "lala" >> /tmp/my.log
terminal1 $ ...

#!/usr/bin/perl -w
use strict;

...
    sleep $sleep;
    seek(LOGFILE, 0, 1);
}