Linux - Replacing spaces in the file names

Question

I have a number of files in a folder, and I want to replace every space character in all file names with underscores. How can I achieve this?

Answer 1

To rename all the files with a .py extension use, find . -iname "*.py" -type f | xargs -I% rename "s/ /_/g" "%"

Sample output,

$ find . -iname "*.py" -type f                                                     
./Sample File.py
./Sample/Sample File.py
$ find . -iname "*.py" -type f | xargs -I% rename "s/ /_/g" "%"
$ find . -iname "*.py" -type f                                                     
./Sample/Sample_File.py
./Sample_File.py