bash Script to remove string from filename

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This bash script is to remove or replace a string from the filename.

#!/bin/bash

for THISFILE in *
do
filename=${THISFILE%\.*}
extension=${THISFILE##*\.}
newname=${filename//./_}
echo "mv $THISFILE ${newname}.${extension}"
#mv $THISFILE ${newname}.${extension}
done



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