How to remove spaces at the end of folder names?

You can do this using a Bash script.

Just create a script and copy this code in it, put it in the top directory in which the "bad named directories" are located, then execute:

#!/bin/bash
    
# find all directory names that end with space:
while find "$(pwd)" -type d |grep  -q ' $'
do
    # select one and store its name in DIR variable
    DIR=$(find "$(pwd)" -type d | grep ' $'|head -1)
    
    # remove the last character (which is space) from that 
    # name and save it to NEW_DIR variable
    NEW_DIR=${DIR%?}
    
    # rename the directory
    mv "$DIR" "$NEW_DIR"
done

As you can see in this screenshot, there were directories which had similar conditions in "test2" directory, and the script named "space.sh" is also located in "test2". After executing the script, directories have been renamed as we desired:

The pathlib module in python3 has all the wherewithal to walk the hierarchy , detect the said files, and rename them.

python3 -c 'import pathlib
for p in iter(pathlib.Path(".").rglob("*[ \t]")):
  p.rename("/".join([str(p.parent),p.name.rstrip()]))'

Based on the kinds of filenames present in your file hierarchy, we use the following piece of python to recursively traverse the tree depth first is the default action . It looks for any non-ASCII names and renames by replacing he nonASCII char. with an "X". No checks are made before renaming whether the new name already exists.

python3 - <<\eof
import pathlib, re
for p in iter(pathlib.Path('.').rglob('*[! -~]*')):
  foo = p.name
  for m in re.finditer(r"[^ -~]",p.name):
    foo = foo[:m.start()] + "X" + foo[m.end():]
  p.rename("/".join([str(p.parent),foo]))
eof

Using Perl's rename.

I didn't write this but I use it a lot. Transferring video files from a Windows box to my Linux box puts extra white spaces at the end of directory names and this command removes them whether it's a single white space or multiple white spaces at the end of folder and file names.

Remove empty spaces at the end of directory / file names in the current directory

does a dry run

rename -n 's/ *$//' ./* 

actual run

rename 's/ *$//' ./*

In python I used os.walk() to process whole file structures cleaning up file and folder names.

I needed something for migrating Apple servers or replacing Netatalk as a file service by Samba on linux.

As there was nothing around solving all naming issues, I ended up writing a python script to do my bidding. Although I tested this only on linux, it should work on any posix system providing python 3.

You can find the code on my git: macSanitize