Rename files by md5 and chosen extension

md5_as_filename.sh

#!/usr/bin/bash

# $1 is the file(s') name to find and hash
# $2 is the extension to be given to each renamed file

find $1 -print0 | xargs -0 md5sum | 
  while read -r newname oldname; do
      mv -v "$oldname" "$newname".$2
  done
 

In a directory containing "some_data.tsv":

bash ./md5_as_filename.sh "some_data.tsv" "descriptiveextension"