# Open4 : undefined method \`spawn' **URL:** \ **Category:** Ruby\ **Created:** [September 3, 2008, 2:26pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594 "2008-09-03T14:26:26Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Une\_BSSSSvS\_ue](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2acd7d/32.png) [@Une\_BSSSSvS\_ue](https://www.ruby-forum.com/u/Une_BSSSSvS_ue)\ **Post date:** [September 3, 2008, 2:26pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594/1 "2008-09-03T14:26:26Z")
I’m trying some samples of open4-0.9.6 : * * * #! /usr/bin/env ruby require ‘rubygems’ require ‘open4’ include Open4 cat = ‘ruby -e" ARGF.each{|line| STDOUT \<\< line} "’ stdout, stderr = ‘’, ‘’ status = spawn cat, ‘stdin’ =\> ‘42’, ‘stdout’ =\> stdout, ‘stderr’ =\> stderr p status p stdout p stderr ## stdout, stderr = ‘’, ‘’ status = spawn cat, 0=\>‘42’, 1=\>stdout, 2=\>stderr p status p stdout p stderr I’ve just added the shebang and “require ‘rubygems’” to the original file. When running it, i get : ./spawn.rb:10: undefined method `spawn’ for main:Object (NoMethodError) seems strange to me because the method spawn IS defined in the “module Open4” (lines 241-320) any idea ? ---
**Author:** ![Une\_BSSSSvS\_ue](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2acd7d/32.png) [@Une\_BSSSSvS\_ue](https://www.ruby-forum.com/u/Une_BSSSSvS_ue)\ **Post date:** [September 3, 2008, 9:49pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594/2 "2008-09-03T21:49:31Z")
On Sep 3, 2008, at 6:19 AM, Une Bévue wrote: > p stdout > Open4" (lines 241-320) > > ## any idea ? > > Une Bévue it does seems strange. for me: cfp:~ \> sudo gem install open4 Successfully installed open4-0.9.6 1 gem installed cfp:~ \> ruby -r rubygems -e’ require “open4” and include Open4 and spawn “echo 42”, :stdout =\> STDOUT and p Open4.version ’ 42 “0.9.6” a @ [http://codeforpeople.com/](http://codeforpeople.com/) ---
**Author:** ![Une\_BSSSSvS\_ue](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2acd7d/32.png) [@Une\_BSSSSvS\_ue](https://www.ruby-forum.com/u/Une_BSSSSvS_ue)\ **Post date:** [September 3, 2008, 10:16pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594/3 "2008-09-03T22:16:31Z")
-------- Original-Nachricht -------- > Datum: Thu, 4 Sep 2008 04:42:56 +0900 > Von: “ara.t.howard” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > An: removed\_email\_address@domain.invalid > Betreff: Re: Open4 : undefined method `spawn' > > include Open4 > > stdout, stderr = ‘’, ‘’ > > (NoMethodError) > > it does seems strange. for me: > > “0.9.6” Hi — what platform are you on ? I tried the code you posted and it works fine on my Ubuntu box. That said, I came across some quite mysterious errors on previous installs of various gems, sent some mails to this and other lists, where the authors said, “I’ve just tried the software on a fresh install of Ubuntu, and it works.” Then I freshly installed Ubuntu, and it worked… never found out what the error was … presumably some path issue with ruby installed in multiple ways … Just guessing … Best regards, Axel ---
**Author:** ![Une\_BSSSSvS\_ue](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2acd7d/32.png) [@Une\_BSSSSvS\_ue](https://www.ruby-forum.com/u/Une_BSSSSvS_ue)\ **Post date:** [September 3, 2008, 10:29pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594/4 "2008-09-03T22:29:27Z")
On Sep 3, 2008, at 2:10 PM, Axel E. wrote: > Hi — > > what platform are you on ? osx. > Just guessing … > > Best regards, > > Axel all the distros, including osx and ubuntu completely hose ruby. that includes redhat enterprise, etc, etc. i always build ruby from src: ./configure --prefix=/usr/local/ && make && sudo make install even on windows (using msys) this has been my preferred method of installing ruby. i too have heard of issues with ubuntu. sorry i can’t be of more help. cheers. a @ [http://codeforpeople.com/](http://codeforpeople.com/) ---
**Author:** ![Une\_BSSSSvS\_ue](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/2acd7d/32.png) [@Une\_BSSSSvS\_ue](https://www.ruby-forum.com/u/Une_BSSSSvS_ue)\ **Post date:** [September 9, 2008, 7:50pm UTC](https://www.ruby-forum.com/t/open4-undefined-method-spawn/147594/5 "2008-09-09T19:50:38Z")
Axel E. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > what platform are you on ? MacOS X 10.4.11 ruby 1.8.6 (2007-09-24 patchlevel 111) [powerpc-darwin8.11.0] MacPorts install (under /opt/local)