From: Ryan Victory <ryan@...>
Date: 2013-01-16T23:46:02+09:00
Subject: Re: Variable empty or not

nil != ""

Your command will always return something, even if it's just an empty
string. Replace the check to nil with "" and it should work. Also, two tips:

1. Don't use $variable variable names unless you absolutely need to,
these are global and make Ruby look like Perl. Also don 't start a
variable name with a capital letter, this denotes a constant. I'd rename
your $Fw_Ip variable to fw_ip
2. If you wanted to check for nil, I'd highly recommend the much cleaner
looking "variable.nil?" syntax, which is also more ruby-esque.

Hope this helps,
Ryan

On 1/16/13 7:19 AM, fox foxmaster wrote:
> Hi all,
>
> I am doing some evaluating on a variable,
> $Fw_Ip = %x[/usr/bin/plink -pw xxxxxx xxxx@xxxxxx "command" |grep
> INACTIVE]
>
> Now I want to do something depending on if the $Fw_Ip is empty or not.
>
> if ($Fw_Ip != nil)
> puts "Active"
> else
> puts "Inactive"
> end
>
> I guess that the variable is not empty so it will always return True but
> if I  puts $Fw_Ip it is empty.
>
> Suggestions on how to solve it would be much appreciated.
>