Method: Bio::Command.query_command

Defined in:
lib/bio/command.rb

.query_command(cmd, query = nil, options = {}) ⇒ Object

Executes the program with the query (String) given to the standard input, waits the program termination, and returns the output data printed to the standard output as a string.

Automatically select popen for Ruby 1.9 or Windows environment and fork for the others.

Available options:

:chdir => "path" : changes working directory to the specified path.

Arguments:

  • (required) cmd: Array containing String objects

  • (optional) query: String

  • (optional) options: Hash

Returns

String or nil



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# File 'lib/bio/command.rb', line 442

def query_command(cmd, query = nil, options = {})
  if RUBY_VERSION >= "1.9.0" then
    return query_command_popen(cmd, query, options)
  elsif no_fork? then
    query_command_popen(cmd, query, options)
  else
    begin
      query_command_fork(cmd, query, options)
    rescue NotImplementedError
      # fork(2) not implemented
      @@no_fork = true
      query_command_fork(cmd, query, options)
    end
  end
end