From: wys@... (Clemens Wyss)
Date: 2001-04-24T14:11:25+09:00
Subject: [ruby-talk:14139] Re: threads and IO.popen questions

Jean-Marc Beroud <jean-marc.beroud@ubs.com> wrote in <3AE45AEC.A6144F96
@ubs.com>:

>    begin
>        IO.popen( "gzip -cd #{file}" )
>  
>        rescue
>             # I don't see this message
>             $stderr.puts "ERROR: #{file}: #{$!}"; exit 1
>    end
>
>    Why does IO.popen not generate an exception (gzip fails)?
>    How can I test if gzip is successful or not?
>

the lobal variable $? contains the "exit code" of the last call:
I.e.:
output = IO.popen( "gzip -cd #{file}" )
if not($? == 0) then
  print ("Error #{output.read()}")    	
end


Clemens