in reply to
Check Directories for Files
Just use bash (I'm sorry, Richard! well, yes, bash or whatnot- but.. the real star here is;)
Use gnu findutils
for dir in $(find /rootdir/101/ -type d -name "B??");
do find $dir -type f -exec rm '{}' \; ;
done;
# or to move elsewhere
# do find $dir -type f -exec mv '{}' /tmp/foundstuff/ \; ;
If you know to expect the filesystem hierarchy you suggested- There's not even a need to play with the B?? dirs..
$ find /rootdir/101/ -type f -exec mv '{}' /tmp/foundstuff/ \;