How do I use a perl variable name properly within backticks?

Question

I need to execute the following code on a bash shell:

mogrify -resize 800x600 *JPG

Since the width and height are variables, I tried this:<

Answer 1

In addition to the other good responses, you can also use the readpipe function, which is equivalent to backticks and the qx operator. But like a regular function, you can exercise greater control over how the arguments to it are interpolated.

$output = readpipe("mogrify -resize $wid" . "x$hit *.JPG");
$output = readpipe( sprintf "mogrify -resize %dx%d *.JPG", $wid, $hit );