From nobody Tue Nov 07 15:49:26 2023 X-Original-To: freebsd-questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4SPt2F0yxxz50XP8 for ; Tue, 7 Nov 2023 15:49:41 +0000 (UTC) (envelope-from freebsd@qeng-ho.org) Received: from mailout.qeng-ho.org (mailout.qeng-ho.org [217.155.128.244]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4SPt2D66Fwz3LxN for ; Tue, 7 Nov 2023 15:49:40 +0000 (UTC) (envelope-from freebsd@qeng-ho.org) Authentication-Results: mx1.freebsd.org; none Received: from [IPV6:2a02:8010:64c9:1::2] (unknown [IPv6:2a02:8010:64c9:1::2]) by mailout.qeng-ho.org (Postfix) with ESMTP id 389BEF6A63; Tue, 7 Nov 2023 15:49:38 +0000 (GMT) Message-ID: <7343a882-747d-4756-9298-3737880bb435@qeng-ho.org> Date: Tue, 7 Nov 2023 14:49:26 -0100 List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Trying to replace a bashism in bourne sh Content-Language: en-GB To: D'Arcy Cain , freebsd-questions@freebsd.org References: <8cdcb170-1c54-464b-aa89-c89ca98c86ca@druid.net> <48b15ea2-3fd5-4994-aace-f0b8d7dc6ede@qeng-ho.org> From: Arthur Chance In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spamd-Bar: ---- X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:13037, ipnet:217.155.0.0/16, country:GB] X-Rspamd-Queue-Id: 4SPt2D66Fwz3LxN On 07/11/2023 13:53, D'Arcy Cain wrote: > On 2023-11-07 02:21, Arthur Chance wrote: >> On 06/11/2023 18:45, D'Arcy Cain wrote: >>> I need to do this; >>> >>>    ifconfig_eth3="inet $((16#c0a8c0${me} + 100))/24" >>> >>> Problem is that I need to do this at boot time but then it runs as >>> bourne sh.  Does anyone have an equivalent for sh? >> >> I'm not totally familiar with bash but that (16#c0a8c0) is a hexadecimal >> number equivalent to an address triplet 192.168.192. I'd guess ${me} is > > I should have explained more.  Basically I have a bunch of servers all > on the same network.  I have two ethernet (or more) interfaces on each. > I am setting up both IPV4 and IPV6 on both the public and the private > side.  I have a script that gets sourced into a small rc.conf for each > server.  The idea was to use the same last octet on every interface. > > In the server rc.conf I have something like this: > > hostname="smaug.vex.net" > me=44 # 68 > . /blah/rc.conf # common code > > I use hex for "me" so that I can create IPV6 addresses.  So far so good. > > Recently, someone else set up iLO on some of the servers.  To access iLO > she used one of the extra ports on the servers with more than two and > put a separate network on it.  For some reason she says that she can't > use the same last octet for that address as the other interfaces.  I > don't know enough about iLO yet to understand why so I am just adding > the 100 as she did.  At least I don't have to worry about IPV6 right now. > I see des@ has pointed out that you can use the 0x prefix instead of 16# in sh (which means I've learnt something new today). That looks like the easiest option for you. -- We build our computer systems the way we build our cities; over time, without a plan, on top of ruins. — Ellen Ullman