Here's a one-liner for you: 
perl -e '-e $ARGV[0] ? sleep 10 : die "GONE!" while 1' <FILENAME>

[download]
Of course, the complexity of your final script depends entirely on what you want to do when the file disappears, which you haven't quite stated... 
   MeowChow                                               
                print $/='"',(`$^X\144oc $^X\146aq1`)[-2]

In reply to Re: perl daemon by MeowChow
in thread perl daemon by Anonymous Monk

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