Ruby subprocess

[badcherry]

I am wanting inside of a ruby script to execute another ruby script in
a subprocess in the same manner as exec(). As first thought I
considered seeing if you can lookup the ruby executable path from
within ruby, but I couldn't find a way of doing it. If that was the
case you could just say exec("/usr/bin/ruby " + "file.rb").

 

[ara.t.howard]

I am wanting inside of a ruby script to execute another ruby script in
a subprocess in the same manner as exec(). As first thought I
considered seeing if you can lookup the ruby executable path from
within ruby, but I couldn't find a way of doing it. If that was the
case you could just say exec("/usr/bin/ruby " + "file.rb").

require 'rbconfig'

def which_ruby
c = ::Config::CONFIG
File::join(c['bindir'], c['ruby_install_name']) << c['EXEEXT']
end

ruby = which_ruby

exec ruby, 'file.rb'

probably won't work on windows since the one-click breaks (or used to break)
rbconfig.

-a

 

[Robert Klemme]

I am wanting inside of a ruby script to execute another ruby script in
a subprocess in the same manner as exec(). As first thought I
considered seeing if you can lookup the ruby executable path from
within ruby, but I couldn't find a way of doing it. If that was the
case you could just say exec("/usr/bin/ruby " + "file.rb").

Depending on the platform you can use fork like this:

child_pid = fork do
# child code
load "file.rb"
end
# ...
Process.wait(child_pid)
print "Child ", child_pid, " exited with ", $?.exitstatus, "\n"

See
http://www.ruby-doc.org/core/classes/Kernel.html#M005750
http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_threads.html

HTH

robert

 

[badcherry]

require 'rbconfig'

def which_ruby
c = ::Config::CONFIG
File::join(c['bindir'], c['ruby_install_name']) << c['EXEEXT']
end

ruby = which_ruby

exec ruby, 'file.rb'

probably won't work on windows since the one-click breaks (or used to break)
rbconfig.

This will work for now, but didn't test it on windows yet. Thanks,
much.