Command Syntax Lab Answers

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In this lecture I’m gonna give you the answers to the questions, from the Command Syntax Section.

We’ll take a look at the command syntax from get service

The Answer is in 6 parts, we’ll start from the left and work to the right 

  1. Every cmdlet is based upon the same structure A name for this structure is?  Verb - Noun
  2. A dash tells PowerShell that a Parameter is being used.
  3. Two angle brackets tell’s me that this a Argument.
  4. The word string is located between two angle brackets, string is called a Value Type.
  5. When two square brackets are surrounded by two angle brackets this tells us that this can take multiple arguments separated by a comma.
  6. These three groups are called _Parameter sets.

Question 2 video and tablet  

The question was:

  • Take a look at the parameter sets from get-service. Can you tell me which parameters are unique in each set? Now tell me what parameters are common in each set. 

The answer is in three parts. 

  • In order to have a parameter set each set must have at least one unique parameter. Our unique parameters in this case are:
  • Displayname from set #1
  • Inputobject from set # 2
  • Name from # 3

Question 2 Part 2 

  • Question was: 
  • Now tell me what parameters are common to each set.

The Common Parameters in Set # 1,2, 3 are:

  • Computername, DependentServices, Exclude, Include, RequiredServices, Common Parameters 

Question 2 Part 3 

  • The Question was:

You probably noticed that commonparameters are common to all three sets.

  • What command would you use to checkout the help for commonparameters?
  • Type get-help about_common_parameters.

Scroll to the top. 

  • Some of the highlights are debug, outvariable, verbose, whatif and confirm
  • If you want to know more notice there are descriptions for each parameter. 
  • Most of the time these parameters work with every cmdlet.

Question # 3

  • The Question was:
  • If I type get-service, then press return. 

Why does the command run without using any parameters?

Type CLS

  • Type get-help get-service -full. 
  • Now using the syntax, explain why getservice ran without using any parameters. 

The answer is:

  • Because all the parameters in parameter set # 2 and 3, all have square brackets around them. 
  • That means that all the parameters are optional and not needed. 

And that means that get-service will run by itself without any parameters.

Question #4 

  • The question was:

Type get-eventlog, then press return. 

Notice that geteventlog is asking for a value or a logname

Press Ctrl-C

  • Using the syntax, explain why geteventlog requires you to type a value or a logname, while get-service ran without a value or even a parameter
  • Type get-help get-eventlog -full. Scroll up to the Syntax section.
  • Notice that every parameter is surrounded by square brackets. 
  • That means that all the parameters for the command get-eventlog are optional and not needed.
  • Notice that -logname is surrounded by square brackets but the argument is not. 

That means that -logname is optional (you don’t have to type -logname) 

but you have to type a string (which in this case is a text string) 

  • So that’s why when you type get-eventlog and you press return

PowerShell asks you for a value.

  • Let’s go ahead and type security (which is one of the Windows log files.

Question #5 

  • The Question was:
  • Using help get-eventlog -showwindow. 
  • Take a look at the parameter -instanceID . 
  • Explain why -instanceID should be second in the order of parameters?

-InstanceID <int64> is position 1 so it’s second in the lineup of parameters.

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