Xdialog --backtitle "$BGTITLE" \
        --title "Remove user" \
        --checkist "Please select the options you'd like to remove the user with" 0 0 2 \
 "Remove" "Are you sure you want to remove this user?" off \
 "Directory" "Remove users directory?" off 2>$TEMP

#!/bin/sh - 
# Purpose: "Remove account" dialog example
# Args: none
# Variables. Change these.
dialog=gdialog

# Variables.
progn=${0//*\//}
tmpf="${TMP:="/tmp/${progn}"}.tmp"
msg=( "Napalm. Smell. Morning." "Wisely choose, you should." "Whatever." \
"OMG! PONIES!" "Bah!" "WTF?" "FCOL, NOT AGAIN!" "Ill hit YOU one more time!" \
"You owe me USD `date +%s`!" "Your ${RANDOM}th moronic move..." )

# Functions.
rmTemp() { [ -f "${tmpf}" ] && rm "${tmpf}"; }

selectUser() { # Select username and do some checks.
rmTemp
$dialog --title "Title" --inputbox "${mesg}Select user to remove" 10 10 2> "${tmpf}"
# Did the user click "OK"?
if [ $? -ne 0 ]; then rmTemp; exit 1; fi
USER=($(< "${tmpf}"))
# Is the variable filled?
if [ $? -eq 0 -a ${#USER[@]} -eq 0 -o ${#USER[@]} -gt 1 ]; then
 # No, rerun. Entertain user ;-p
 mesg="${msg[${RANDOM:0:1}]}\n"; selectUser
else
 # Yes. Let's prepare for checks.
 USER=${USER[0]}
 # Minimal username length
 if [ ${#USER} -lt 3 ]; then
  # Rerun
  mesg="${msg[${RANDOM:0:1}]}\n"; selectUser
 fi
 # Garbage input
 good_chars="a-zA-Z0-9_-"
 if [ "${USER//[^$good_chars]/}" != "${USER}" ]; then
  # Rerun
  mesg="${msg[${RANDOM:0:1}]}\n"; selectUser
 fi
 # Get account specs from passwd.
 USERSPECS=$(getent passwd $USER)
 USERSPECS=${USERSPECS// /_}; USERSPECS=${USERSPECS//::/:NOVALUE:}
 USERSPECS=${USERSPECS//:/ }; USERSPECS=(${USERSPECS[@]})
 # Get value of unprivileged users.
 SYSUIDS=($(grep ^UID_MIN /etc/login.defs 2>/dev/null))
 SYSUIDS=${SYSUIDS[1]}
 # Fill with reasonable default if value is empty.
 if [ -z $SYSUIDS ]; then SYSUIDS=500; fi
 # Check if user is a privileged slash system user.
 if [ ${USERSPECS[2]} -le $SYSUIDS ]; then
  mesg="Can't remove privileged users.\n"; selectUser
 fi
 # Check where $USER hangs his hat (/home).
 case "${USERSPECS[5]}" in
  /home/*) USER_NAME=${USERSPECS[0]}; USER_HOME=${USERSPECS[5]};;
  *) mesg="Home ("${USERSPECS[5]}") is not in /home.\n"; selectUser;;
 esac
fi
rmTemp
}

selectOpts() { # Username confirmation and option remove $HOME.
rmTemp
if [ -z $USER_NAME -o -z $USER_HOME ]; then exit 127; fi
$dialog --title "Title" --checklist \
"${mesg}Please select the options you'd like to remove the user with" 10 10 2 \
 r0 "Are you sure you want to remove user $USER_NAME?" off \
 r1 "Remove users home $USER_HOME?" off 2> "${tmpf}" 
if [ $? -eq 0 ]; then
 opts=($(<"${tmpf}")); opts=${opts[@]//\"/}
 # Is them variables filled?
 if [ $? -eq 0 -a ${#opts[@]} -ge 0 ]; then
  for opt in ${opts[@]}; do case "${opt}" in
  r0) DEL=YES;; r1) USERDEL_FLAGS="-r";; *) ;;
  esac; done
  # We're good to go. Don't do stuff but echo.
  # Note exit values should be checked and fed back in a $dialog.
  case "$DEL" in YES) echo "userdel ${USERDEL_FLAGS} $USER_NAME";; esac
 else
  # No, rerun. Entertain user some more.
  mesg="${msg[${RANDOM:0:1}]}\n"; selectOpts
 fi
fi
rmTemp
}

selectUser
selectOpts

exit 0

function help() { echo "Bash scripting guides:
http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html 
http://www.tldp.org/LDP/Bash-Beginners-Guide/html/index.html 
http://www.tldp.org/LDP/abs/html/; }