How do I prevent expansion when I use a pattern as argument to a script?

Question

I need a very simple script which does this:

mogrify -resize $1x$2^ -gravity center -crop $1x$2+0+0 $3

so that I can call it in this way:

cropresize.sh 110 110 *.png

the problem is that the shell expands the *.png pattern instead of passing it as it is to the script.

How can I achieve this (script, alias or any other equivalent solution is fine)?

Answer 1

Since the shell performs glob expansion before the arguments are handed over to the command, there's no way I can think of to do it transparently: it's either controlled by the user (quote the parameter) or brute-force (disable globbing completely for your shell with set -o noglob).

You're looking at the problem from the wrong end. Change your script to accept multiple filename arguments:

x=$1
y=$2
shift 2
mogrify -resize ${x}x${y}^ -gravity center -crop ${x}x${y}+0+0 "$@"

Answer 2

Have you tried

cropresize.sh 110 110 \*.png

But I can only see zsh (not bash) expanding it like you say.