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It was not meant as a solution, but to show you what would happen...

It would only work with single brackets, and only if there are zero or one files. With two or more files the test will fail....

the shell will glob the files and iterate over each. the -nt is test switch for newer than. parsing ls can be problematic for files with special characters in them.

What shell are you using? I'm only famaliar with bash, but I think you're using ksh. Seems the expansions are done in different order.

bash:

[mute@geek ~/temp/sethmj]$ shopt -s extglob...