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

In bash use command rename :)

 rename 's/\.htm$/.html/' *.htm

 # or

 find . -name '*.txt' -print0 | xargs -0 rename 's/.txt$/.xml/'

 #Obs1: Above I use regex \. --> literal '.'  and  $ --> end of line
 #Obs2: Use find -maxdepht 'value' for determine how recursive is
 #Obs3: Use -print0 to avoid 'names spaces asdfa' crash!