usage: tailf [-t] ['[/pattern/[i]] [perl-code]'] file
options: -t  flag each line with a time stamp
examples: 
  tailf ~/Mail/.log
  tailf '/ssh/' /var/adm/messages
  tailf -t watchlog
  tailf '/spam/i system qq[sendmsg -qfs "$_" framstag\@bofh]' syslog&