[clug] Amusing little /bin/sh question..

[Kim Holburn]

A small change to a.sh:
--------------------
#! /bin/sh

set -e
set -o nounset

somevar="a-value"

if [ "$1" = "--somevar" ]; then
   exit
fi

<lots of other things with $somevar>
----------------

in another script:

. a.sh --somevar
echo $somevar


On 2007/May/23, at 8:52 AM, Andrew Janke wrote:

> Hi all,
>
> Just a quick one that has be somewhat bemused..
>
> If I have one shell script (a.sh) as such:
>
> ----
> #! /bin/sh
>
> set -e
> set -o nounset
>
> somevar="a-value"
>
> <lots of other things with $somevar>
> ----
>
> How can I get what the value of somevar in another script, for example
> I can do this on the C/L:
>
>  mavis:dir$ set -n && a.sh && echo $somevar
>
> Things will sort of work but the question is how to do this within
> another shell script as such (b.sh)
>
> ---
> #! /bin/sh
>
> set -e
> set -o nounset
>
> thevalueIwant=`something magic with a.sh`
>
> ---
>
> Of course I could resort to dirty tricks such as this:
>
>   thevalueIwant=`grep somevar a.sh | head -1 | cut -f2 -d\=`
>
> But then I am relying on myself not writing a comment about somevar
> and other things..  Of course I could do this....
>
>   thevalueIwant=`grep -v \# a.sh | grep somevar | head -1 | cut -f2  
> -d\=`
>
> but now we are getting really ugly.
>
> Just wanted to know if anyone knows a "nice" way to do this.
>
>
> ta
>
>
> a
>
> PS: answers of converting it to perl/python/ruby/etc are not
> considered answers! :)
>
>
> -- 
> Andrew Janke   (a.janke at gmail.com || http://a.janke.googlepages.com/)
> Canberra->Australia    +61 (402) 700 883
> -- 
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--
Kim Holburn
IT Network & Security Consultant
Ph: +39 06 855 4294  M: +39 3494957443
mailto:kim at holburn.net  aim://kimholburn
skype://kholburn - PGP Public Key on request

Democracy imposed from without is the severest form of tyranny.
                           -- Lloyd Biggle, Jr. Analog, Apr 1961