if statement

[Ray Parrish]

Hello,

I am having difficulty with an if statement. Here it is -

# load the sleep interval in seconds from the command line.
interval=$2;
    # if specified interval in seconds is less than 200 or empty, set it 
to the default of 300 seconds
    if  [ $interval == "" ]

        then
            interval=300; # five minutes default setting
            echo "interval blank";
    fi

Here is the error I keep getting, no matter how I try to change the if 
statement around -

ray at RaysComputer:~$ ~/WebChange/UpdateWebURL.sh 
http://finance.yahoo.com/q?s=MSFT
/home/ray/WebChange/UpdateWebURL.sh: line 25: [: ==: unary operator expected

I actually want to check to see if interval is blank or less than 200, 
but I can't seem to get that to work.

This happens with a single "=" as well. What am I doing wrong here?

Thanks for any help you can be. Later, Ray Parrish

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