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

Andrew Janke a.janke at gmail.com
Wed May 23 06:52:38 GMT 2007

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


<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.



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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