I would like to have some like that :
tail -f syslog | grep Daemon | while read Message ; do
Unfortunally it *seems* like grep is buffering the though-flow. Because this
tail -f syslog | while read Message ; do
works. Except the case that grep is missing. Why does is seem that grep is buffering the through-flow ? It actually waits until I kill the tail process and EOF comes.