Method: FileUtils#sh

Defined in:
lib/rake/file_utils.rb

#sh(*cmd, &block) ⇒ Object

Run the system command cmd. If multiple arguments are given the command is run directly (without the shell, same semantics as Kernel::exec and Kernel::system).

It is recommended you use the multiple argument form over interpolating user input for both usability and security reasons. With the multiple argument form you can easily process files with spaces or other shell reserved characters in them. With the multiple argument form your rake tasks are not vulnerable to users providing an argument like ; rm # -rf /.

If a block is given, upon command completion the block is called with an OK flag (true on a zero exit status) and a Process::Status object. Without a block a RuntimeError is raised when the command exits non-zero.

Examples:

sh 'ls -ltr'

sh 'ls', 'file with spaces'

# check exit status after command runs
sh %{grep pattern file} do |ok, res|
  if !ok
    puts "pattern not found (status = #{res.exitstatus})"
  end
end

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# File 'lib/rake/file_utils.rb', line 43

def sh(*cmd, &block)
  options = (Hash === cmd.last) ? cmd.pop : {}
  shell_runner = block_given? ? block : create_shell_runner(cmd)

  set_verbose_option(options)
  verbose = options.delete :verbose
  noop    = options.delete(:noop) || Rake::FileUtilsExt.nowrite_flag

  Rake.rake_output_message sh_show_command cmd if verbose

  unless noop
    res = (Hash === cmd.last) ? system(*cmd) : system(*cmd, options)
    status = $?
    status = Rake::PseudoStatus.new(1) if !res && status.nil?
    shell_runner.call(res, status)
  end
end