tail -f 引发的思考

tail -f -F

tail -f => tail --follow=descriptor
tail -F => tail --follow=name --retry

example1:
-----start----
first:
tail -f testfile
tail -F testfile
then:
rm -f testfile
then:
see the difference...
then:
touch testfile
then:
see the difference...
------end------

example2:
----start----
touch testfile
echo 'test' > testfile
tail -f testfile
$Pid = ps aux | grep 'tail' | grep -v 'grep'
rm testfile
ls -l /proc/$pid/fd/
cp /proc/$pid/fd/4 /tmp/testfile
then, file recovery.
----end---

proc learning
http://www.linuxdiyf.com/bbs/viewthread.php?tid=2683