Running a shell command for a specific period of time

[Erik Bixby]

I was wondering if anyone knew a way to allow a shell command to run for a
specific period of time. In this particular case, I want tcpdump to run for
23 hours, 59 minutes, 59 seconds. I couldn't find anything in the tcpdump
man page that gave me the impression that tcpdump itself has that
functionality. And, I couldn't find anything in a quick google search. I
also thought it was an interesting scripting trick that I don't know, and
thought I'd ask you nice folks...
-Erik
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