Find and replace filename recursively in a directory

Question

I want to rename all the files in a folder which starts with 123_xxx.txt to xxx.txt.

For example, my directory has:

123_xxx         


        

Answer 1

Tried the answer above but it didn't work for me cause i had the string inside folders and files name at the same time so here is what i did the following bash script:

  for fileType in d f
  do
    find  -type $fileType -iname "stringToSearch*" |while read file
    do
      mv $file $( sed -r "s/stringToSearch/stringToReplaceWith/" <<< $file )
    done
  done

First i began by replacing inside folders name then inside files name.