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Date: 25 Jul 2004 19:55:34 -0000
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From: tmseck-lists@netcologne.de (Thomas-Martin Seck)
To: Craig Rodrigues <rodrigc@crodrigues.org>
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Subject: Re: HEADS UP: change in ports rc.d script behaviour
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* Craig Rodrigues <rodrigc@crodrigues.org> [gmane.os.freebsd.current]:

> On Sun, Jul 25, 2004 at 05:12:08PM +0300, Mike Makonnen wrote:
>> 4. If you must include a default value for an rc.conf(5) knob,
>>    make sure that you put it in an if [ -z "$foo_knob"] clause.
> 
> As a simple alternative to an if clause, I've done this for the 
> isc-dhcp3-server port:
> 
> [ -z "$dhcpd_enable" ] && dhcpd_enable="NO"

Even simpler:

foo_enable=${foo_enable:-"NO"}

or

: ${foo_enable:="NO"}