rename extension of multiple files in linux

rename extension of multiple files in linux


My requirement was to rename the extension of multiple files in a directory.
My Directory was having some 20 image files with extension ".png" .
I want to rename the extension ".png" to ".bmp" in the directory.

I tried this script and it was working fine.


# List files ending with ".png"
for i in `ls *.png`; 
        do
# Get the File Name without Extension
        d=`echo $i|tr -d ".png"`
#Append .bmp to the File Name and rename the file
        mv  $i "$d.bmp"; 
done


I run this in CentOS.

One thing is the use of tr command in the script helps to get the file name by cutting the extension.

tr -  Translate or delete characters

-d
option implies to delete characters with ".png" in the word