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

I prefer to use the command 'rename', which takes Perl-style regexes:

rename "s/ /_/g" *

You can do a dry run with the -n flag:

rename -n "s/ /_/g" *