"Denis B. Roegel" <Denis(_dot_)Roegel(_at_)loria(_dot_)fr> writes:
I have rules in which I build incrementally an environment
variable. Then, if the variable is non-empty,
I want to use its value as a parameter to an external program,
and get the result back. Here is an excerpt of my rules :
---------------------------------
FOUND=""
:0 c:
* (^TO|^From.*)johnny
johnny
:0A
{ FOUND="$FOUND johnny" }
:0
* ! FOUND ?? \<\>
|echo $FOUND >> found.list
---------------------------------
Questions :
1) the test `! FOUND ?? \<\>' does not seem to work ; what I want
to do is to test whether $FOUND is different to "" ; how should
I do it ?
If it's not empty, then it contains at least one character:
:0
* FOUND ?? .
|echo $FOUND >>found.list
There are other more obscure ways to do it, of course.
2) the echo command seems to work, provided the condition is true ;
now, suppose I want to call `myprogram' with parameter $FOUND,
and get the result back in RESULT, how do I do it ?
:0
* FOUND ?? .
RESULT=| myprogram $FOUND
The stdout of myprogram will be captured at stored in the variable
RESULT.
Philip Guenther