Use of uninitialized value $file in concatenation

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use strict; 

...
    print STDOUT "$output.wav $output.mfc\n";
}
close(PROMPT);

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Use of uninitialized value $file in concatenation (.) or string at scr
+ipts/conca
tprompt.pl line 29, <PROMPT> line 100.
sox           S00100.wav
sox FAIL sox: Not enough input filenames specified

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perl -w scripts/concatprompt.pl trainprompts > codetrain.scp

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