# String test.


echo "**** String comparisons."
string="In Xanadu did Kublai Khan..."

echo -n "test of a string: "
if (test "$string") then
   echo "We have a non-null \$string. Expected."
else
    echo "\$string is null."
fi

echo -n "test of a string: "
if (test $notset) then
    echo "How did \$notset get a value?"
else
    echo "\$notset has not been set. Expected."
fi

echo -n "test -z: "
if (test -z $notset) then   
    echo "Length of \$notset is zero. Expected."
else
    echo "Length of \$notset is NOT zero."
fi

# Note quotes around multi-word string.
echo -n "test -z: "
if (test -z "$string") then   
    echo "Length of \$string is zero."
else
    echo "Length of \$string is NOT zero. Expected."
fi

echo -n "test -n: "
if (test -n "$string") then
    echo "Length of \$string is NOT zero. Expected."
else
    echo "Length of \$string is zero."
fi


echo -n "test =: "
if (test "$string" = "$string") then
    echo "Strings are equal. Expected."
else
    echo "Strings are not equal."
fi

# Tricky one. Notice the difference.
echo -n "test =: "
if (test "$string" = "$string ") then
    echo "Strings are equal. "
else
    echo "Strings are not equal. Expected"
fi


echo -n "test =: "
if (test "$string" = "In Xanadu did Kublai Khan...") then
    echo "Strings are equal. Expected."
else
    echo "Strings are not equal."
fi


echo -n "test !=: "
if (test "$string" != "In Xanadu did Kublai Khan...") then
    echo "Strings are equal."
else
    echo "Strings are not equal. Expected."
fi

echo -n "test !=: "
if (test "$string" != "$notset" ) then
    echo "Strings are not equal. Expected."
else
    echo "Strings are equal."
fi

echo