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Batch rename files if they don't contain a character

I have audio files names either 'A_B.wav' or 'A.wav'. I'd like to rename all files with a filename in the format 'A.wav' to 'A_A.wav' and leave all other files unchanged.

In other words, I need to batch rename only files that contain no underscore.

Is there a way to do this via the Linux console?

Solution 
  • #!/bin/bash

for i in *;
do
    j=`echo $i | cut -d . -f 1`;
    e=`echo $i | cut -d . -f 2`;
    if [[ $j != *_* ]]
    then
        j=$j"_"$j"."$e;
        mv $i $j;
    fi
done