How do I rename files in sub directories?

Question

Is there any way of batch renaming files in sub directories?

For example:

Rename *.html to *.htm in a folder which has directories

Answer 1

AWK on Linux. For the first directory this is your answer... Extrapolate by recursively calling awk on dir_path perhaps by writing another awk which writes this exact awk below... and so on.

ls dir_path/. | awk -F"." '{print "mv file_name/"$0" dir_path/"$1".new_extension"}' |csh