From owner-freebsd-questions@freebsd.org Tue Nov 7 17:49:19 2017 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B2C3BE5FD24 for ; Tue, 7 Nov 2017 17:49:19 +0000 (UTC) (envelope-from smithi@nimnet.asn.au) Received: from sola.nimnet.asn.au (paqi.nimnet.asn.au [115.70.110.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3197F7AF97 for ; Tue, 7 Nov 2017 17:49:18 +0000 (UTC) (envelope-from smithi@nimnet.asn.au) Received: from localhost (localhost [127.0.0.1]) by sola.nimnet.asn.au (8.14.2/8.14.2) with ESMTP id vA7HnE7M073212; Wed, 8 Nov 2017 04:49:14 +1100 (EST) (envelope-from smithi@nimnet.asn.au) Date: Wed, 8 Nov 2017 04:49:14 +1100 (EST) From: Ian Smith To: Ernie Luzar cc: freebsd-questions@freebsd.org Subject: Re: Need help with rc.d script In-Reply-To: <20171108021900.W9710@sola.nimnet.asn.au> Message-ID: <20171108043726.N72828@sola.nimnet.asn.au> References: <20171108021900.W9710@sola.nimnet.asn.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Nov 2017 17:49:19 -0000 On Wed, 8 Nov 2017 02:38:54 +1100, Ian Smith wrote: > > # This is the continuous loop checking the current ip address to > > # to determin if it changed. > > while [ 1 ]; do > > More portable (for any shell) is 'while true; do' .. > > > # Get the IP address assigned to that NIC device name. > > nic_ip="$(ifconfig $nic_devicename inet | \ > > grep -o "inet.*" | cut -d ' ' -f 2)" More problematic and unnecessary double quotes I missed before .. > > #echo "nic_ip2 = ${nic_ip}" > > > > if [ "${prev_ip}" != "${nic_ip}" ]; then > > # Update dynamic DNS hosting site with new ip address. > > website="https://dynamicdns.park-your-domain.com/update?" > > dyn_host="host=home-fbsd&domain=host.xxxxxxx.com" > > password="&password=a3e0ffc2274746b29ceaf126d59e51c1" > > url="$website$dyn_host$password" > > #echo "$url" > > /usr/local/bin/wget -O /var/log/namecheap.dynip.update.log -q "$url" > > #echo "rtn-code = $?" > > if [ $? -ne 0 ]; then > > echo "Error: /usr/local/bin/wget command failed." > > exit 3 > > fi > > #echo "${nic_ip}" > ${prev_ip_file} > > prev_ip="${nic_ip}" > > fi > > sleep ${elapse_time} > > done > > You do NOT need to use daemon, all you need to do is replace done with > > done & > > and perhaps test to be clear that's working, > > echo "dynip script done" > exit 0 > > So that the script and so run_rc_command will complete, leaving the > "while .. done &" subshell running in background. On second thoughts, 'while .. done' in this particular context might not run in a subshell. If the above method doesn't work, force that section to run in a specific subshell in background, like so: ( while true; do [..] done ) & echo that worked exit 0 cheers, Ian