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

Here is another solution:

ls | awk '{printf("\"%s\"\n", $0)}' | sed 'p; s/\ /_/g' | xargs -n2 mv

1. uses awk to add quotes around the name of the file
2. uses sed to replace space with underscores; prints the original name with quotes(from awk); then the substituted name
3. xargs takes 2 lines at a time and passes it to mv