my lame attempt at a shell script...

[Tom Vilot]

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

----



I believe that is what you are after.

When you *assign* you don't use $