From: jackster the jackle <johnsheahan@...>
Date: 2008-10-20T02:19:23+09:00
Subject: Re: Error Exception if script doesn't run

Brian Candler wrote:
> jackster the jackle wrote:
>> $? equals 0, however if I change the path to js.txt to something that 
>> doesn't exist in order to make it fail, $? has a value of 256.
> 
> That's because the low-order 8 bits of $? encode something different; 
> the next 7 bits are the exit code (0 to 127). Use $?.exitstatus to get 
> that.
> 
> http://www.ruby-doc.org/core/classes/Process/Status.html
> 
>> I thought $? should always have a value of 1 when it fails? Why is it 
>> 256?
> 
> The exit status in this case is 256 >> 8, which is 1.

this code seems to work well for what I need:

`cp /xhome/jsmith/js.txt /home/jsmith/js2.txt`
unless $?.success?; raise "error with: #{$0}" ; end

I would like to be able to add the line number of the file into the 
error message with the file name ($0) but when I try other global 
variables such as $@ or $. I don't get the line number of the script 
that failed?

jack



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