if statement

[Ray Parrish]

sam wrote:
> Ray Parrish wrote:
>   
>> 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
>>
>>     
> the use of square brackets (if [...]) uses linux command test to provide
> the boolean value.
>
> try man test for starters
>
> sam
>   
test!!! he says as he slaps his forehead. I've been trying "man if" 
which does not work.

Very good pointer, thanks for that!

Later, Ray Parrish

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