Problem
You would like to rename multiple files, replacing some text with something else (like replacing Pixies_The with Pixies).
Solution
Install the rename utility
sudo apt install renameand replace the text as follows
cd folder_to_rename_filesrename 's/Pixies_The/Pixies/g' **Problem
You want to replace the spaces in filenames (ie in Brennan’s B2 system), that uses busybox and you do not have all the linux commands available.
Solution
Use the following in the directory with the files (ie flac files). At the moment this command only works in the directory that is being run.
# find . -type f -name "*.flac" -exec ash -c 'mv "$0" "${0// /_}"' '{}' ';'