Linux Ubuntu change extension to lowercase

Changing extension to lower case with linux for multiple text, csv files and other. So all you need to do is to go to the folder with your text files and then run the command:

  • text files
 for i in $( ls *.TXT ); do echo $i; mv $i  ${i%%.TXT}.txt; done
  • csv files
for i in $( ls *.CSV ); do echo $i; mv $i  ${i%%.CSV}.csv; done

You can rename or add back up to multiple files as well:

for i in $( ls *.TXT ); do echo $i; mv $i  ${i%%.TXT}.txt.bak; done

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