LPRng-HOWTO: 15 Oct 2001 (For LPRng-3.7.9)
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# 12.4. Using :oh To Select Printcap Information

When administering a large number of printers over a large area, it is sometimes desirable to have a default printer for each host. This default printer may be different for each host, and can be selected by using the `oh` entry. The `oh` value is a list of the following entries

        [!] IP/n     - address + mask length    10.0.0.0/8
        [!] IP/IP    - address + mask           10.0.0.0/255.0.0.0
        [!] vvv      - glob for hostname        pc*.org.com

The LPRng software will determine the hostnames and IP addresses assigned to the host and then check to see if there is a match in the listed hostnames or IP addresses. The optional test inversion (`!`) causes the sense of the match to be inverted. The list of addresses or entries are tested in sequence until a match is found. If no match is found the printcap entry will not be used. For example:

        lp:oh=*.admin.org.com,10.0.0.5,10.2.0.0/16:lp=pr1@server1
        lp:oh=*.eng.org.com:lp=hp@server2
        color:oh=*.eng.org.com:lp=color@server3
        color:oh=!*.eng.org.com:lp=color@server4

In the above example, if our host name is `booster.admin.org.com`, then we would use `lp=pr1@server1`, as the `*.admin.org.com` glob pattern would match our host name.

if our host name is `booster.dev.org.com` and our IP address is 10.2.0.1, then we would use `lp=pr1@server1`, as the `10.2.0.0/16` ip address would be in the specified address range.

Finally we have an example of the use of the match inversion operator (`!`). All hosts whose name matches `*.eng.org.com` will use `color@server3` and the others will use `color@server4`.

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