SETUP.sh

#!/bin/bash
#
# $Id: SETUP.sh,v 1.38 2008/11/29 13:42:39 mbse Exp $
# 
# Basic setup script for MBSE BBS
#
# (C) Michiel Broek
#
# Customisation section, change the next variables to your need.
# However, all docs refer to the setup below.
#
# Basic bbs root directory.
clear
MHOME=/opt/mbse
PATH=/bin:/sbin:/usr/bin:/usr/sbin:
DISTNAME=
DISTVERS=
OSTYPE=$( uname -s )

#------------------------------------------------------------------------
#
# Logging procedure, needs two parameters.
#
log() {
    /bin/echo $( date +%d-%b-%y\ %X ) $1 $2 >> SETUP.log
}


#------------------------------------------------------------------------
#
cat << EOF
MBSE BBS for Unix, first time setup. Checking your system..."

If anything goes wrong with this script, look at the output of
the file SETUP.log that is created by this script in this
directory. If you can't get this script to run on your system,
mail this logfile to Michiel Broek at 2:280/2802 or email it
to mbroek@mbse.eu

EOF

echo -n "Press ENTER to start the basic checks "
read junk

log "+" "MBSE BBS $0 started by $(whoami)"
log "+" "Current directory is $(pwd)"

# Check the OS type, only Linux for now.
#
if [ "$OSTYPE" != "Linux" ] && [ "$OSTYPE" != "FreeBSD" ] && [ "$OSTYPE" != "NetBSD" ] && [ "$OSTYPE" != "OpenBSD" ] && [ "$OSTYPE" != "Darwin" ]; then

    cat << EOF

Your are trying to install MBSE BBS on a $OSTYPE system, however
at this time only Linux, FreeBSD, NetBSD, OpenBSD and Darwin (OS X)
are supported.

EOF
    log "!" "Aborted, OS is $OSTYPE"
    exit 2
fi


#
# First do various tests to see which Linux distribution this is.
#
if [ "$OSTYPE" = "Linux" ]; then
    PW=
    if [ -f /etc/slackware-version ]; then
    	# Slackware 7.0 and later
    	DISTNAME="Slackware"
	# There are two styles, newer releases are like "Slackware 12.0.0"
	if grep -q Slackware /etc/slackware-version ; then
	    DISTVERS=$( cat /etc/slackware-version | awk '{ print $2 }' )
	else
	    DISTVERS=$( cat /etc/slackware-version )
	fi
    elif [ -f /etc/slamd64-version ]; then
	# Slamd64
	DISTNAME="Slamd64"
	DISTVERS=`cat /etc/slamd64-version`
    elif [ -f /etc/zenwalk-version ]; then
	DISTNAME="Zenwalk"
	DISTVERS=$( cat /etc/zenwalk-version | awk '{ print $2 }' )
    elif [ -f /etc/debian_version ]; then
	# Debian, at least since version 2.2
	DISTNAME="Debian"
	DISTVERS=$( cat /etc/debian_version )
	# Ubuntu is based on Debian
	if grep -q "Ubuntu" /etc/issue ; then
	    DISTNAME="Ubuntu"
	    DISTVERS=$( cat /etc/issue | awk '{ print $2 }' )
	fi
    elif [ -f /etc/SuSE-release ]; then
	DISTNAME="SuSE"
	DISTVERS=$( cat /etc/SuSE-release | grep VERSION | awk '{ print $3 }' )
	# Mandrake test before RedHat, Mandrake has a redhat-release
	# file also which is a symbolic link to mandrake-release.
    elif [ -f /etc/mandrake-release ]; then
	DISTNAME="Mandrake"
	# Format: Linux Mandrake release 8.0 (Cooker) for i586
	DISTVERS=$( cat /etc/mandrake-release | awk '{ print $4 }' )
    elif [ -f /etc/redhat-release ]; then
	DISTNAME="RedHat"
	if grep -q e-smith /etc/redhat-release ; then
	    DISTVERS=$( cat /etc/redhat-release | awk '{ print $13 }' | tr -d \) )
	else
	    DISTVERS=$( cat /etc/redhat-release | awk '{ print $5 }' )
	fi
    elif [ -f /etc/gentoo-release ]; then
        DISTNAME="Gentoo"
        DISTVERS=$( cat /etc/gentoo-release | awk '{ print $5 }' )
    elif [ -f /etc/arch-release ]; then
	DISTNAME="Arch Linux"
	DISTVERS="N/A"
    else
        DISTNAME="Unknown"
    fi
elif [ "$OSTYPE" = "FreeBSD" ]; then
    DISTNAME="FreeBSD"
    DISTVERS=$(uname -r)
    PW="pw "
elif [ "$OSTYPE" = "NetBSD" ]; then
    DISTNAME="NetBSD"
    DISTVERS=$(uname -r)
elif [ "$OSTYPE" = "OpenBSD" ]; then
    DISTNAME="OpenBSD"
    DISTVERS=$(uname -r)
elif [ "$OSTYPE" = "Darwin" ]; then
    DISTNAME="Darwin"
    DISTVERS=$(uname -r)
else
    DISTNAME="Unknown"
fi
log "+" "Detected \"${OSTYPE}\" (${HOSTTYPE}) \"${DISTNAME}\" version \"${DISTVERS}\""


# Basic checks.
if [ "$DISTNAME" = "Unknown" ]; then
    cat << EOF

    Your are trying to install MBSE BBS on a $OSTYPE system, however
    that distribution is unknown.

EOF
    log "!" "Aborted, OS is $OSTYPE, distribution is unknown"
    exit 2
fi

if [ $( whoami ) != "root" ]; then
cat << EOF
*** Run $0 as root only! ***

  Because some of the system files must be changed, you must be root
  to use this script.

*** SETUP aborted ***
EOF
	log "!" "Aborted, not root"
	exit 2
fi

if [ "$MBSE_ROOT" != "" ]; then
	echo "*** The MBSE_ROOT variable exists: $MBSE_ROOT ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, MBSE_ROOT variable exists: ${MBSE_ROOT}"
	exit 2
fi

if grep -q ^mbse: /etc/passwd ; then
	echo "*** User 'mbse' already exists on this system ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, user 'mbse' already exists on this system"
	exit 2
fi

if grep -q ^bbs: /etc/group ; then
	echo "*** Group 'bbs' already exists on this system ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, group 'bbs' already exists on this system"
	exit 2
fi

if [ -f /etc/passwd.lock ]; then
	echo "*** The password file is locked, make sure that nobody"
	echo "    is using any password utilities. ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, password file is locked"
	exit 2
fi

#
# Check if this is Ubuntu. Ubuntu by default has no xinetd installed.
#
if [ "$DISTNAME" = "Ubuntu" ]; then
    if [ ! -f /etc/xinetd.d/echo ]; then
	echo "*** You seem to be using Ubuntu but have not yet installed xinetd."
	echo "    'sudo apt-get install xinetd' will install that for you. ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, Ubuntu without xinetd package"
	exit 2
    fi
fi

if [ "$DISTNAME" = "Arch Linux" ]; then
    if [ ! -f /etc/xinetd.d/servers ]; then
	echo "*** You seem to be using Arch Linux but have not yet installed xinetd."
	echo "    'pacman -S xinetd' will install that for you. ***"
	echo "*** SETUP aborted ***"
	log "!" "Aborted, Arch Linux without xinetd package"
	exit 2
    fi
fi

clear

if [ "$OSTYPE" = "Linux" ]; then
    if [ -d /opt ]; then
    	log "+" "Directory /opt already present"
    else
    	mkdir /opt
    	log "+" "Directory /opt created"
	echo "Directory /opt created."
    fi
fi

if [ "$OSTYPE" = "FreeBSD" ] || [ "$OSTYPE" = "NetBSD" ] || [ "$OSTYPE" = "OpenBSD" ] || [ "$OSTYPE" = "Darwin" ]; then
    #
    #  FreeBSD/NetBSD/OpenBSD/Darwin uses /usr/local for extra packages
    #  and doesn't use /opt.
    #  Also using /opt means that we are in the root partition which
    #  by default is very small. We put everything in /usr/local/opt
    #  and create symlinks to it.
    #
    if [ -d /opt ]; then
	log "+" "Directory /opt already present"
    else
    	if [ -d /usr/local/opt ]; then
	    log "+" "Directory /usr/local/opt already present"
    	else
	    mkdir -p /usr/local/opt
	    log "+" "Directory /usr/local/opt created"
	    echo "Directory /usr/local/opt created."
        fi
    	ln -s /usr/local/opt /opt
	log "+" "Link /opt to /usr/local/opt created"
	echo "Link /opt to /usr/local/opt created."
    fi
fi


cat << EOF
    Basic checks done.

    The detected $OSTYPE distribution is $DISTNAME $DISTVERS

    Everything looks allright to start the installation now.
    Next the script will install a new group 'bbs' and two new
    users, 'mbse' which is the bbs system account, and 'bbs' which
    is the login account for bbs users. This account will have no
    password! The shell for this account is the main bbs program.

    One final important note: This script will make changes to some
    of your system files. Because I don't have access to all kinds of
    distributions and configurations there is no garantee that this
    script is perfect. Please make sure you have a recent system backup.
    Also make sure you have resque boot disks and know how to repair
    your system. It might also be wise to login as root on another
    virtual console incase something goes wrong with system login.

    Darwin (OS X) Users must install the .dmg image of user utils
    available on Version Tracker and within this archive prior
    to continuing the installation.

    If you are not sure, or forgot something, hit Control-C now or
EOF

echo -n "    press Enter to start the installation "
read junk
clear

#------------------------------------------------------------------------
#
#  The real work starts here
#
log "+" "Starting installation"
echo "Installing MBSE BBS for the first time..."
echo ""
echo -n "Adding group 'bbs'"
$PW groupadd bbs
log "+" "[$?] Added group bbs"

echo -n ", user 'mbse' $OSTYPE "
if [ "$OSTYPE" = "Linux" ]; then
    # Different distros have different needs...
    GRPS="uucp"
    if grep -q ^wheel /etc/group ; then
	GRPS=${GRPS}",wheel"
    fi
    if [ "$DISTNAME" = "Ubuntu" ]; then
	GRPS=${GRPS}",adm,admin"
	if ! grep -q ^admin /etc/group ; then
	    # Fresh install of Ubuntu 12.04+ has no admin group; we need it to enable use of sudo.
	    $PW groupadd admin
	fi
    fi
    if grep -q ^dialout /etc/group ; then
	GRPS=${GRPS}",dialout"
    fi
    if grep -q ^dip /etc/group ; then
	GRPS=${GRPS}",dip"
    fi
    log "+" "useradd -c \"MBSE BBS Admin\" -d $MHOME -g bbs -G $GRPS -m -s /bin/bash mbse"
    useradd -c "MBSE BBS Admin" -d $MHOME -g bbs -G $GRPS -m -s /bin/bash mbse
elif [ "$OSTYPE" = "FreeBSD" ]; then
    pw useradd mbse -c "MBSE BBS Admin" -d $MHOME -g bbs -G wheel,dialer -m -s /usr/local/bin/bash
elif [ "$OSTYPE" = "NetBSD" ]; then
    useradd -c "MBSE BBS Admin" -d $MHOME -g bbs -G wheel,dialer -m -s /usr/pkg/bin/bash mbse
elif [ "$OSTYPE" = "OpenBSD" ]; then
    useradd -c "MBSE BBS Admin" -d $MHOME -g bbs -G wheel,dialer -m -s /usr/local/bin/bash mbse
elif [ "$OSTYPE" = "Darwin" ]; then
    useradd mbse -c "MBSE BBS Admin" -d $MHOME -g bbs -s /bin/bash
fi
log "+" "[$?] Added user mbse"
chmod 755 $MHOME
log "+" "[$?] chmod 755 $MHOME"

echo -n " writing '$MHOME/.profile'"
cat << EOF >$MHOME/.profile
# profile for mbse
#
export PATH=\$HOME/bin:\$PATH
export MBSE_ROOT=\$HOME
export GOLDED=\$HOME/etc
# For xterm on the Gnome desktop:
cd \$HOME
#
export COLUMNS LINES
EOF
chown mbse $MHOME/.profile
chgrp bbs $MHOME/.profile
echo ""
log "+" "Created $MHOME/.profile"

# On some systems there is a .bashrc file in the users homedir.
# It must be removed.
if [ -f $MHOME/.bashrc ] || [ -f $MHOME/.bash_profile ]; then
      echo "Removing '$MHOME/.bash*'"
      rm -f $MHOME/.bash*
      log "+" "Removed $MHOME/.bash* files"
fi

echo ""
echo "Now set the login password for user 'mbse'"
passwd mbse
log "+" "[$?] Password is set for user mbse"


echo -n "Adding user 'bbs'"
if [ ! -d $MHOME/home ]; then
    mkdir $MHOME/home
    log "+" "[$?] Created directory $MHOME/home"
fi
chown mbse $MHOME/home
log "+" "[$?] chown mbse $MHOME/home"
chgrp bbs $MHOME/home
log "+" "[$?] chgrp bbs $MHOME/home"
chmod 770 $MHOME/home
log "+" "[$?] chmod 770 $MHOME/home"
if [ "$OSTYPE" = "Linux" ]; then
    useradd -c "MBSE BBS Login" -d $MHOME/home/bbs -g bbs -s $MHOME/bin/mbnewusr bbs
    log "+" "[$?] Added user bbs"
fi
if [ "$OSTYPE" = "FreeBSD" ]; then
    pw useradd bbs -c "MBSE BBS Login" -d $MHOME/home/bbs -g bbs -s $MHOME/bin/mbnewusr
    log "+" "[$?] Added user bbs"
fi
if [ "$OSTYPE" = "NetBSD" ]; then
    useradd -c "MBSE BBS Login" -d $MHOME/home/bbs -m -g bbs -s $MHOME/bin/mbnewusr bbs
    log "+" "[$?] Added user bbs"
fi
if [ "$OSTYPE" = "OpenBSD" ]; then
    useradd -c "MBSE BBS Login" -d $MHOME/home/bbs -m -g bbs -s $MHOME/bin/mbnewusr bbs
    log "+" "[$?] Added user bbs"
fi
if [ "$OSTYPE" = "Darwin" ]; then
    useradd bbs -c "MBSE BBS Login" -d $MHOME/home/bbs -g bbs -s $MHOME/bin/mbnewuser
    log "+" "[$?] Added user bbs"
fi
# Some systems (RedHat and Mandrake) insist on creating a users homedir.
# NetBSD gives errormessages when not creating a homedir, so we let it create.
# These are full of garbage we don't need. Kill it first.
if [ -d $MHOME/home/bbs ]; then
    rm -Rf $MHOME/home/bbs
    log "+" "[$?] Removed $MHOME/home/bbs"
fi
mkdir -m 0770 $MHOME/home/bbs
log "+" "[$?] mkdir $MHOME/home/bbs"
chown mbse $MHOME/home/bbs
log "+" "[$?] chown mbse $MHOME/home/bbs"
chgrp bbs $MHOME/home/bbs
log "+" "[$?] chgrp bbs $MHOME/home/bbs"

echo ", removing password:"
if [ "$OSTYPE" = "Linux" ]; then
   echo -n "$$" >/etc/passwd.lock
   if [ -f /etc/shadow ]; then
	log "+" "Standard shadow password system"
	# Not all systems are the same...
	if grep -q ^bbs:\!\!: /etc/shadow ; then
	    sed /bbs:\!\!:/s/bbs:\!\!:/bbs::/ /etc/shadow >/etc/shadow.bbs
	else
	    sed /bbs:\!:/s/bbs:\!:/bbs::/ /etc/shadow >/etc/shadow.bbs
	fi
	log "+" "[$?] removed password from user bbs"
	mv /etc/shadow /etc/shadow.mbse
	log "+" "[$?] made backup of /etc/shadow"
	mv /etc/shadow.bbs /etc/shadow
	log "+" "[$?] moved new /etc/shadow in place"
	if [ "$DISTNAME" = "Debian" ] || [ "$DISTNAME" = "Ubuntu" ] || [ "$DISTNAME" = "SuSE" ]; then
	    # Debian, Ubuntu and SuSE use other ownership of /etc/shadow
	    chmod 640 /etc/shadow
	    chgrp shadow /etc/shadow
	    log "+" "[$?] Debian/Ubuntu/SuSE style owner of /etc/shadow (0640 root.shadow)"
	else
	    chmod 600 /etc/shadow
	    log "+" "[$?] Default style owner of /etc/shadow (0600 root.root)"
	fi
	echo " File /etc/shadow.mbse is your backup of /etc/shadow"
    else
	log "+" "Not a shadow password system"
        if grep -q ^bbs:\!\!: /etc/passwd ; then
            sed /bbs:\!\!:/s/bbs:\!\!:/bbs::/ /etc/passwd >/etc/passwd.bbs
        else
            sed /bbs:\!:/s/bbs:\!:/bbs::/ /etc/passwd >/etc/passwd.bbs
        fi
	log "+" "[$?] Removed password of user bbs"
	mv /etc/passwd /etc/passwd.mbse
	log "+" "[$?] Made backup of /etc/passwd"
	mv /etc/passwd.bbs /etc/passwd
	log "+" "[$?] Moved new /etc/passwd in place"
        chmod 644 /etc/passwd
	log "+" "[$?] Changed owner of /etc/passwd"
	echo " File /etc/passwd.mbse is your backup of /etc/passwd"
    fi
    rm /etc/passwd.lock
fi
if [ "$OSTYPE" = "NetBSD" ] || [ "$OSTYPE" = "OpenBSD" ] || [ "$OSTYPE" = "Darwin" ]; then
cat << EOF

READ THIS CAREFULLY NOW   READ THIS CAREFULLY NOW

I don't know how to automatic remove the password for the "bbs"
user account in NetBSD/Darwin. You have to do this for me!
Next I start the editor you need to use, remove all the stars"
after the word Password, then save the file with "wq!"

EOF
    echo -n "Press Enter when ready "
    read junk
    chpass bbs
fi
if [ "$OSTYPE" = "FreeBSD" ]; then
    #
    #  FreeBSD has a util to remove a password
    #
    chpass -p "" bbs
    log "+" "[$?] Removed password of user bbs"
fi
echo ""


if grep -q ^binkp /etc/services ; then
    BINKD=FALSE
else
    BINKD=TRUE
fi
if grep -q 60179\/tcp /etc/services ; then
    FIDO_TCP=FALSE
else
    FIDO_TCP=TRUE
fi
if grep -q 60179\/udp /etc/services ; then
    FIDO_UDP=FALSE
else
    FIDO_UDP=TRUE
fi
if grep -q ^tfido /etc/services ; then
    TFIDO=FALSE
else
    TFIDO=TRUE
fi

log "+" "Services: binkp=$BINKD fido_tcp=$FIDO_TCP fido_udp=$FIDO_UDP tfido=$TFIDO"

if [ "$FIDO_TCP" = "TRUE" ] || [ "$FIDO_UDP" = "TRUE" ] || [ "$TFIDO" = "TRUE" ] || [ "$BINKD" = "TRUE" ]; then
    echo -n "Modifying /etc/services"
    log "+" "Modifying /etc/services"
    mv /etc/services /etc/services.mbse
    cat /etc/services.mbse >/etc/services
    echo "#" >>/etc/services
    echo "# Unofficial for MBSE BBS" >>/etc/services
    echo "#" >>/etc/services
    if [ "$BINKD" = "TRUE" ]; then
	echo -n ", binkp at port 24554"
	echo "binkp		24554/tcp		# mbcico IBN mode">>/etc/services
    fi
    if [ "$TFIDO" = "TRUE" ]; then
	echo -n ", tfido at port 60177"
	echo "tfido		60177/tcp		# mbcico ITN mode (alternate port)">>/etc/services
    fi
    if [ "$FIDO_TCP" = "TRUE" ]; then
	echo -n ", fido tcp at port 60179"
	echo "fido		60179/tcp		# mbcico IFC mode">>/etc/services
    fi
    if [ "$FIDO_UDP" = "TRUE" ]; then
	echo -n ", fido udp at port 60179"
	echo "fido		60179/udp		# Chatserver">>/etc/services
    fi
    chmod 644 /etc/services
    echo ", done."
fi


if [ -f /etc/inetd.conf ]; then
    log "+" "/etc/inetd.conf found, inetd system"
    if ! grep -q mbcico /etc/inetd.conf ; then
	echo -n "Modifying /etc/inetd.conf"
	log "+" "Modifying /etc/inetd.conf"
	mv /etc/inetd.conf /etc/inetd.conf.mbse
	cat /etc/inetd.conf.mbse >/etc/inetd.conf
cat << EOF >>/etc/inetd.conf

#:MBSE-BBS: bbs service
binkp	stream	tcp	nowait	mbse	$MHOME/bin/mbcico	mbcico -t ibn
fido	stream	tcp	nowait	mbse	$MHOME/bin/mbcico	mbcico -t ifc
tfido	stream	tcp	nowait	mbse	$MHOME/bin/mbcico	mbcico -t itn
# Example Linux telnet to the BBS
#telnet	stream	tcp	nowait	root	/usr/sbin/tcpd	in.telnetd -L $MHOME/bin/mblogin
# Example FreeBSD telnet to the BBS
#telnet  stream  tcp     nowait  root   /usr/libexec/telnetd  telnetd -p $MHOME/bin/mblogin
# Example OpenBSD telnet to the BBS
#telnet  stream  tcp     nowait  root   /usr/libexec/tcpd     telnetd -L $MHOME/bin/mblogin
# Example NetBSD telnet to the BBS
#telnet  stream  tcp     nowait  root   /usr/libexec/telnetd  telnetd -g mbsebbs

EOF
	chmod 644 /etc/inetd.conf
	if [ -f /var/run/inetd.pid ]; then
		echo -n ", restarting inetd"
		kill -HUP $( cat /var/run/inetd.pid )
		log "+" "[$?] restarted inetd"
	else
		log "!" "Warning: no inetd.pid file found"
	fi
	echo ", done."
    fi
fi

if [ "$OSTYPE" = "NetBSD" ]; then
  if [ -f /etc/gettytab ]; then
    if ! grep mbsebbs /etc/gettytab ; then
      log "+" "[$?] adding mbsebbs login to /etc/gettytab"
cat << EOF >>/etc/gettytab

#
# Login entry for mbsebbs.
#
mbsebbs:cd:ck:np:lo=$MHOME/bin/mblogin:sp#38400:
EOF
    fi
  fi
fi

if [ -f /etc/xinetd.conf ]; then
    log "+" "/etc/xinetd.conf found, xinetd system"
    if [ -d /etc/xinetd.d ]; then
	log "+" "has xinetd.d subdir, writing files"
	XINET="/etc/xinetd.d/mbsebbs"
    else
	log "+" "appending to xinetd.conf"
	XINET="/etc/xinetd.conf"
    fi
cat << EOF >> $XINET
#:MBSE BBS services are defined here.
#
# Author: Michiel Broek <mbse@mbse.eu>, 27-Sep-2004

service binkp
{
	socket_type	= stream
	protocol	= tcp
	wait		= no
	user		= mbse
	instances	= 10
	server		= $MHOME/bin/mbcico
	server_args	= -t ibn
}

service fido
{
	socket_type	= stream
	protocol	= tcp
	wait		= no
	user		= mbse
	instances	= 10
	server		= $MHOME/bin/mbcico
	server_args	= -t ifc
}

service tfido
{
	socket_type     = stream
	protocol        = tcp
	wait            = no
	user            = mbse
	instances       = 10
	server          = $MHOME/bin/mbcico
	server_args	= -t itn
}

# Telnet to the bbs using mblogin, disabled by default.
#
service telnet
{
	disable		= yes
	protocol	= tcp
	instances	= 10
	flags		= REUSE
	log_on_failure += USERID
	socket_type	= stream
	user		= root
	server		= /usr/sbin/telnetd
	server_args	= -L $MHOME/bin/mblogin
	wait		= no
}

EOF

fi

# We made it, copy the logfile to mbse's homedir so that when the
# /tmp directory is cleaned, we still have it.
cat SETUP.log >> $MHOME/SETUP.log

echo ""
echo -n "Press Enter to continue"
read junk
clear

cat << EOF
     The script made it to the end, that looks good. Before you logout do some
     sanity checks;

     1. Can you still login as a normal user.

     2. Login on another virtual console, network or whatever as user 'mbse'.
        Then type 'echo \$MBSE_ROOT'. Does this show the path to
        '$MHOME' or nothing. 

     3. Login on another virtual console as user 'bbs'. It should not ask for
        a password, but should direct try to start the bbs. This is not
        installed yet but you should see error messages and then be logged out.

     If these three tests weren't successfull, restore /etc/passwd and
     or /etc/shadow, the backup copies have the extension '.mbse'.
     Then issue (as root of course) the following commands:

EOF
if [ "$OSTYPE" = "Linux" ] || [ "$OSTYPE" = "NetBSD" ] || [ "$OSTYPE" = "OpenBSD" ]; then
    if [ "$DISTNAME" = "Ubuntu" ]; then
	echo "     sudo userdel bbs"
	echo "     sudo userdel -r mbse"
	echo "     sudo groupdel bbs"
    else
    	echo "     userdel bbs"
    	echo "     userdel -r mbse"
    	echo "     groupdel bbs"
    fi
fi
if [ "$OSTYPE" = "FreeBSD" ]; then
    echo "     pw userdel bbs -r"
    echo "     pw userdel mbse -r"
    echo "     pw groupdel bbs"
fi