Mine

#!/bin/sh
# $Xorg: xinitrc.cpp,v 1.3 2000/08/17 19:54:30 cpqbld Exp $

userresources=$HOME/.Xresources
usermodmap=$HOME/.Xmodmap
xinitdir=/etc/X11
sysresources=$xinitdir/Xresources
sysmodmap=$xinitdir/Xmodmap

# merge in defaults and keymaps

if [ -f $sysresources ]; then
    xrdb -merge $sysresources
fi

if [ -f $sysmodmap ]; then
    xmodmap $sysmodmap
fi
if [ -f $userresources ]; then
    xrdb -merge $userresources
fi

if [ -f $usermodmap ]; then
    xmodmap $usermodmap
fi

# First try ~/.xinitrc
if [ -f "$HOME/.xinitrc" ]; then
        XINITRC="$HOME/.xinitrc"
        if [ -x $XINITRC ]; then
                # if the x bit is set on .xinitrc
                # it means the xinitrc is not a
                # shell script but something else
                exec $XINITRC
        else
                exec /bin/sh "$HOME/.xinitrc"
        fi

# If not present, try the system default
elif [ -n "`/etc/X11/chooser.sh`" ]; then
        exec "`/etc/X11/chooser.sh`"
                # it means the xinitrc is not a
                # shell script but something else
                exec $XINITRC
        else
                exec /bin/sh "$HOME/.xinitrc"
        fi

# If not present, try the system default
elif [ -n "`/etc/X11/chooser.sh`" ]; then
        exec "`/etc/X11/chooser.sh`"

# Failsafe
else
        # start some nice programs
        twm &
        xclock -geometry 50x50-1+1 &
        xterm -geometry 80x50+494+51 &
        xterm -geometry 80x20+494-0 &
        exec xterm -geometry 80x66+0+0 -name login
fi