code/snippets/process_spawn.rb


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# This call will start up the 'rails server' process with the
# RAILS_ENV environment variable set to 'test'.
Process.spawn({'RAILS_ENV' => 'test'}, 'rails server')

# This call will merge STDERR with STDOUT for the duration
# of the 'ls --help' program.
Process.spawn('ls', '--zz', STDERR => STDOUT)