my lame attempt at a shell script...
norgaard at locolomo.org
Tue Jan 4 00:56:38 PST 2005
Eric F Crist wrote:
> Sorry for the double reply, but I forgot to respond to the top half of
> this email. By including /etc/rc.subr, what exactly do I gain? There
> are already built-in means to execute a custom firewall script:
> I would assume that the system would institute my firewall rules at the
> correct stage of startup, and thus, don't really want to mess with
> that. Please enlighten me as to rc.subr and it's benefits. I'm new to
> shell scripting, and I need all the knowledge I can gain.
Including rc.subr has become the standard way of creating scripts for
startup of services, rc.diskless has been replaced by initdiskless in
rc.d, there are scripts ipfw, ip6fw, ipfilter, and pf for the various
Currently, ipfw/ip6fw calls rc.firewall/rc.firewall6 respectively. I
wouldn't count on rc.firewall to be available in future versions, it
would make sense that these are merged into ipfw/ip6fw.
rc.subr contains some neat functions, use warn, and your warning is also
logged using logger, rc.subr automatically pulls defaults/rc.conf and
rc.conf for you, contains the control switch statement you'd otherwise
have to write your self, and lots of other goodies, see rc.subr(8).
Of course, if you are just writing one script, you might find it too
much trouble, but since this is the standard recommended way of doing
what you want to do, you win in the long run on maintainablility.
Really, what you gain is that you can focus on writing the stuff that
makes your script different, rather than writing all the trivialities
all scripts need.
PS: Sorry about that wildshot, " = " for assignment/comparison - too
much Perl, C etc. here... :-)
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