'How to grab value back from external script in bash?

I'm sure I'm missing something stupid. I want to pass a full path variable to a perl script, where I do some work on it and then pass it back. So I have:

    echo "Backing up: $f ";
    $write_file="$(perl /home/spider/web/foo.com/public_html/gen-path.cgi $f)";
    echo "WRITE TO: $write_file \n";

However, this gives me:

Backing up: /home/spider/web/foo.com/public_html/websites-uk/uk/q/u
backup-files-all.sh: line 7: =backup-uk-q-u.tar.gz: command not found
WRITE TO:  \n

I can't work out why its not saving the output into $write_file. I must be missing something (bash isn't my prefered language, which is why I'm passing to Perl as I'm a lot more fluent in that :))

bash


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