Shell Programming and Scripting

I was wondering if someone could help me or atleast push me in the right direction.

All my users have a folder with their username (i.e. john.doe ) some of these folders contain a subdirectory with the first letter of there first name and there lastname (i.e. jdoe )

I'm trying to create a script that will go through the first level of each users sub-directory and compare the users username (i.e. john.doe ) to the subdirectory and the subdirectory is named (i.e. jdoe ) then move all the contents up one level.

The username that are in this format (i.e. john.doe ) will be pulled from a text file.

A sketch (not tested):

Code:

cd USERS_DIR
while read userdir; do
  if [ -d "$userdir" ]; then
    subdir="$userdir"/`echo "$userdir" | sed  's/^\(.\).*\.\(.*\)$/\1\2/'`
    if [ -d "$subdir" ]; then
       echo mv "$subdir"/* "$userdir"
    fi
  fi
done <USERNAMES_FILE