Replace Spaces with Underscores in File Names

[cartwright76]

I often get files with many spaces as part of their names. I would like to automatically replace these spaces with underscores, but otherwise not change the file name. Is there a way to do this task with just the bash shell? Thanks for the help!

[rajkumarmadhani]

in vi editor

:%s/ /_/g

[cartwright76]

So I understand the 's/ /_/g' portion for 's/old/new/g' as replacing all the occurrences of spaces within the text document with underscores. However, I do not know what the % does in this particular example. Also, It seems like this command replaces all occurrences of a space character with an underscore within the document. I do not want to alter the file contents, but merely the name of the file itself.

For example:

This is my file.pdf ------> This_is_my_file.pdf

Thanks again.

[Piyu_86]

this script will convert the name of all the files present in that directory.

for file in *;
do
mv "$file" "${file// /_}"
done

[cartwright76]

Thank you very much. That worked perfectly!