10.5: Repair a user/group Finder crashing issue

#!/bin/bash
#
# Leopard User Fix by Thinkyhead
#
# Fixes the broken group membership in Leopard after an upgrade
#

if [ `whoami` == "root" ]; then
 echo "[ERROR] `basename $0` must be executed as an admin user (no sudo)."
 exit 1
fi

GID_IS_UID=`sudo dscl . read /Users/$USER | grep PrimaryGroupID | grep "$UID"`
GID_IS_STAFF=`sudo dscl . read /Users/$USER | grep PrimaryGroupID | grep 20`

if [ -z $GID_IS_UID ]; then
 echo "[ERROR] It looks like your account is already fixed!"
  if [ -z "$GID_IS_STAFF" ]; then
   echo "[ERROR] However, you are not a member of group 'staff' which is bad!"
  fi

 echo -n "Would you like to proceed anyway? (y/N):"; read PROCEED
 if [ -z $REPAIR ] || [ "$PROCEED" = "n" ] || [ "$PROCEED" = "N" ]; then
  exit 0
 fi
fi

#
# 1. Change User's primary group to "staff" (20):
#
	sudo dscl . changei /Users/$USER PrimaryGroupID 1 20

#
# 2. Make sure the user is in the "staff" group in Directory Services:
#

USER_IS_IN_STAFF=`sudo dscl . read /Groups/staff | grep GroupMembership | grep "$USER"`

if [ -z $USER_IS_IN_STAFF ]; then
	sudo dscl . append /Groups/staff GroupMembership $USER
fi

#
# 3. Fix group permissions on all items in the user's home folder:
#
	sudo chgrp -R staff $HOME

#
# ...or more slowly, but more accurately:
#
#	sudo chgrp staff $HOME
#	sudo find $HOME -group $UID -exec chgrp staff "{}" ;
#

#
# 4. Delete the group that's no longer in use:
#
	sudo dscl . delete /Groups/$USER >/dev/null 2>&1

#
# 5. Repair Permissions
#

echo -n "Would you like to repair permissions? (Y/n):"; read REPAIR
if [ -z $REPAIR ] || [ "$REPAIR" = "y" ] || [ "$REPAIR" = "Y" ]; then
  sudo diskutil repairPermissions /
fi

#
# 6. Reboot for safety.
#

echo -n "Logging out is recommended, but reboot is more thorough.nWould you like to reboot? (Y/n):"; read REBOOT
if [ -z $REBOOT ] || [ "$REBOOT" = "y" ] || [ "$REBOOT" = "Y" ]; then
  reboot
fi

exit 0