replace a 'space' char in filename with an underscore

Question

I have a bunch of files in a directory with 'spaces' in the filename.

How do I perform a bulk rename of all filenames with 'spaces' and replace them with an '_' char.

Looking at the other solutions, I've tried the following command w/o success:

find . -name '* *' -exec rename ' ' '_' {} +

find: rename: No such file or directory

Answer 1

Try:

$ for file in *; do [ -f "$file" ] && ( mv "$file" "$(echo $file | sed -e 's/ /_/g')" ); done

Answer 2

There's no direct answer, but most you will get are wrong in one way or another. Most likely, they will not use find properly, and you might get stupid results if any filename contains a ^J. 

Also if you have /lots/ of files, you probably don't want your script to spawn a sed or mv for each entry.

Here's a way to do it properly with basic Perl:

find . -print0 | \
  perl -e '$/="\000";' -ne '$o=$_;tr/ /_/;rename($o,$_);'

Answer 3

Thanks for the answers.

I found this one liner that did the trick:

for i in *\ *; do if [ -f "$i" ]; then mv "$i" ${i// /_}; fi; done