====== Linux - Files - Rename file extension recursively ======

Rename all JPG file extensions to JPEG, recursively and handles sub-directories also.

<code bash>
#!/bin/bash

function rename_extension
{
  # Change all .jpg to .jpeg,
  for file in $1/*.jpg; do
    mv $file $1/`basename $file .jpg`.jpeg;
    echo $file;
  done;

  # Recurse directories.
  for d in $1/*; do
    if test -d $d; then
      rename_extension $d;
    fi;
  done;
}

dir=`pwd`;

rename_extension $dir;
</code>