# Checks for environment variables.

# Uncomment the following line to remove the variable.
#unset DISPLAY

if [ "$DISPLAY" == "" ] 
then
    echo "DISPLAY not set, using :0.0 as default."
    DISPLAY=":0.0"
fi



#unset SHELL

if [ "$SHELL" == "" ] 
then
    echo "Using /bin/bash, which is the shell you should use."
    SHELL=/bin/bash
fi



#unset USER

if [ "$USER" == "" ] 
then
    echo -n "Please enter your username: "
    read USER
fi




#unset HOME

if [ "$HOME" == "" ] 
then
    # Check for Mac OS X home.
    if [ -d "/Users/$USER" ]
    then
        HOME="/Users/$USER"

    # Check for Linux home.
    elif [ -d "/home/$USER" ]
    then
        HOME="/home/$USER"

    else
        echo -n "Please enter your home directory: "
        read HOME
        echo
    fi
fi

# Display all the values.

echo "DISPLAY=$DISPLAY"
echo "SHELL=$SHELL"
echo "USER=$USER"
echo "HOME=$HOME"