script output name from a variable
 

Hello people!!

Whith an script, I want to set the name of an output file employing the name of a variable: e.g.:

while read code
do
out=$code
done < input >> $out.txt

However, the name of the output file I got is '.txt'. But
if i do 'echo $out', i can confirm that the variable has the value i want.

I solved the issue by doing:

done < input >> temp.txt
cp temp.txt $out.txt
rm temp.txt

but this doesn't look so nice ;)

any idea??

Thanks in advance!

One solution

I think that the file designated by the redirection gets opened before the loop starts. thus, the variable is not yet defined.
Some experiments will confirm this, but I think you've already proven it.

pixellany has the right information. At the point of the loop starting the variable is blank and this will be when the file is opened for writing.

Thanks for the replies and explanations!
Yes, the variable is not defined at that stage, so the variable $out must be defined before the loop or I have to adopt the catkin's suggestion
thanks!