Nmap oprions

From: Juan B (juanbabi_at_yahoo.com)
Date: 06/23/05

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    Date: Thu, 23 Jun 2005 10:43:52 -0700 (PDT)
    To: security-basics@securityfocus.com
    
    

    HI,

    I need to scan my big network for port 21 on many
    hosts.

    I want that nmap will show me just the hosts which the
    port found open. I know that I can do this with grep
    but im not sure about the syntex.

    can some one please help.

    thanks.

    J

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