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 and sub directories.

Answer 1

Windows command prompt: (If inside a batch file, change %x to %%x)

for /r %x in (*.html) do ren "%x" *.htm 

This also works for renaming the middle of the files

for /r %x in (website*.html) do ren "%x" site*.htm 

Answer 2

find . -regex ".*html$" | while read line;  do      A=`basename ${line} | sed 's/html$/htm/g'`;     B=`dirname ${line}`;     mv ${line} "${B}/${A}";  done