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#!/usr/bin/env perl -l

...
    #system(@$list_cmd_ref);  # for production
    print "@$list_cmd_ref";   # for debugging
}

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some_backup_prog XXX > XXX.bak
some_list_prog -le XXX
...
some_list_prog -le YYY
some_backup_prog ZZZ > ZZZ.bak
some_list_prog -le ZZZ