modification in command resource example

[Anirudh-Gupta]

Modified the command resource example. The below code fails :

describe command('ls -al /') do
 it { should exist }
end

Instead this should be written :

describe command('ls') do
 it { should exist }
end

[chris-rock]

Thanks @Anirudh-Gupta for highlighting this. The reason for that is the checking for command availability:

if inspec.os.linux?
  res = inspec.backend.run_command("bash -c 'type \"#{@command}\"'")
elsif inspec.os.windows?
  res = inspec.backend.run_command("where.exe \"#{@command}\"")
elsif inspec.os.unix?
  res = inspec.backend.run_command("type \"#{@command}\"")
else
  warn "`command(#{@command}).exist?` is not suported on your OS: #{inspec.os[:family]}"
  return false
end
res.exit_status.to_i == 0

See https://github.com/chef/inspec/blob/master/lib/resources/command.rb#L46-L55