Date: Wed, 29 Aug 2007 21:54:51 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org, Hinkie <Hinkie@paradise.net.nz> Subject: Re: FreeBSD Cron Job to run (ifconfig em0 down; ifconfig em0 up) Message-ID: <20070829185450.GA15895@kobe.laptop> In-Reply-To: <20070829185012.A14865@wojtek.tensor.gdynia.pl> References: <01a901c7ea3d$0ad62720$1e00a8c0@cheqsoft.local> <20070829185012.A14865@wojtek.tensor.gdynia.pl>
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On 2007-08-29 18:51, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote: > fragment from my test program (used for other thing but doesn't matter) > > /sbin/ping -i 0.5 -s 1450 -c 3 tested_host >/dev/null 2>/dev/null > if [ $? != 0 ];then > perform_action_if_doesnt_ping > fi I'm not sure if '!=' is a 'portable' way to write sh(1) tests, but you have a point there :-) Rewriting this as: #!/bin/sh ping -i 0.5 -s 1450 -c 3 tested_host >/dev/null 2>&1 if test $? -eq 0 ; then exit 0 fi perform_action_if_doesnt_ping may save you an extra indentation level too.
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