Rename files and directories recursively under ubuntu /bash

A solution using find:

To rename files only:

find /your/target/path/ -type f -exec rename 's/special/regular/' '{}' \;

To rename directories only:

find /your/target/path/ -type d -execdir rename 's/special/regular/' '{}' \+

To rename both files and directories:

find /your/target/path/ -execdir rename 's/special/regular/' '{}' \+