Date: Wed, 29 Aug 2007 14:18:02 -0500 From: Eric Crist <mnslinky@gmail.com> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, freebsd-questions@freebsd.org, Hinkie <Hinkie@paradise.net.nz> Subject: Re: FreeBSD Cron Job to run (ifconfig em0 down; ifconfig em0 up) Message-ID: <14ECFF9B-9559-4B45-B44B-8E030597B00C@gmail.com> In-Reply-To: <20070829185450.GA15895@kobe.laptop> References: <01a901c7ea3d$0ad62720$1e00a8c0@cheqsoft.local> <20070829185012.A14865@wojtek.tensor.gdynia.pl> <20070829185450.GA15895@kobe.laptop>
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On Aug 29, 2007, at 1:54 PMAug 29, 2007, Giorgos Keramidas wrote: > 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. AFAIK, the != is evaluated by test, not sh. ----- Eric F Crist Secure Computing Networks
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