As tirwhan says, 86_400 is the same as 86400. Perl allows '_' in numbers, and it can appear anywhere in the number. Perl strips out the '_' characters in a number before using it. It is purely cosmetic for ease of reading. 
   perl -e 'print 123_0_33_876,"\n"'

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Copy and paste the above line for an instant demonstration. (If you're on Windows, you may need to change the quoting slightly)

In reply to Re: perl's sleep function by virtualsue
in thread perl's sleep function by jesuashok

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