Date: Thu, 6 Jan 2005 20:09:12 -0600 From: Eric F Crist <ecrist@secure-computing.net> To: Tom Vilot <tom@vilot.com> Cc: FreeBSD-Questions Questions <freebsd-questions@freebsd.org> Subject: Re: my lame attempt at a shell script... Message-ID: <1F964093-6051-11D9-90DC-000D9333E43C@secure-computing.net> In-Reply-To: <41DDE5C5.2050402@vilot.com> References: <06DDB71C-5DB4-11D9-B56F-000D9333E43C@secure-computing.net> <8B357427-5DB7-11D9-89A5-000D93AD26C8@tntluoma.com> <Pine.NEB.4.61.9.0501041028340.407@kenmore.kozy-kabin.nl> <7B531D49-6041-11D9-8A15-000D9333E43C@secure-computing.net> <41DDE5C5.2050402@vilot.com>
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On Jan 6, 2005, at 7:28 PM, Tom Vilot wrote:
> Eric F Crist wrote:
>
>>
>> First off, thanks again for all the help you've offered thus far.
>> That being said, I'm having a problem with variables in a function.
>> The code I'm having a problem with is:
>>
>> setup_loopback () {
>> ${fwcmd} add ${rulenum1} pass all from any to any via lo0;
>> ${rulenum1}=`expr $rulenum1 + 50`
>> ${fwcmd} add ${rulenum1} deny all from any to 127.0.0.0/8;
>> ${rulenum1}=`expr $rulenum1 + 50`
>> ${fwcmd} add ${rulenum1} deny ip from 127.0.0.0/8 to any;
>> ${rulenum1}=`expr $rulenum1 + 50`
>> }
>>
>> The output of this, when run, is:
>>
>> 00050 allow ip from any to any via lo0
>> 50=100: not found
>> 00050 deny ip from any to 127.0.0.0/8
>> 50=100: not found
>> 00050 deny ip from 127.0.0.0/8 to any
>> 50=100: not found
>>
>> This tells me that it's doing the math correctly, but it's not
>> reassigning the calculated value back to the variable.
>>
>> Any pointers?
>
>
> this is a very common mistake and is one of those things about sh and
> bash that drives me batty, too.
>
> You're thinking like perl. :c)
>
> Stripping it down to a test script, I have this:
>
> -----
> rulenum=50
>
> rulenum=`$rulenum + 50`
>
> echo $rulenum
What is the point of the { } around some variables?
_______________________________________________________
Eric F Crist "I am so smart, S.M.R.T!"
Secure Computing Networks -Homer J Simpson
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