How to skip (omit) a sepcific port in nmap

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http://unix.stackexchange.com – With nmap, I want to skip the scan on port 80. I'm sure this is in the man somewhere, but I haven't found it so far. My command is simple: nmap\24 So this will scan ports in the 24.0.0.x range; I just need to avoid port 80 (for stealth reasons). (HowTos)