MicrosoftВ® Windows PowerShell(TM) Step By Step (Step By Step (Microsoft))

In this exercise, we explore the use of constants, variables, concatenation, decision making, and looping as we create 10 folders in the C:\Mytest directory. This directory was created earlier. If you do not have this folder on your machine, you can either create it manually or modify both the step-by-step exercise and the one step further exercise to use a folder that exists on your machine.

  1. Open Notepad or your favorite Windows PowerShell script editor.

  2. Create a variable called $intFolders and have it hold the value of 10. The code to do this is shown here:

    $intFolders = 10

  3. Create a variable called $intPad. Do not put anything in the variable yet. This code is shown here:

    $intPad

  4. Create a variable called $i and put the number 1 in it. The code to do this is shown here:

    $i = 1

  5. Use the New-Variable cmdlet to create a variable named strPrefix. Use the value argument of the cmdlet to assign the value of "testFolder" to the variable. Use the option argument to make $strPrefix into a constant. The code to do this is shown here:

    New-Variable -Name strPrefix -Value "testFolder" -Option constant

  6. Open a do … until statement. Include the opening curly bracket for the script block. This code is shown here:

    do {

  7. Begin an if … else statement. The condition to be evaluated is if the variable $i is less than 10. The code that does this is shown here:

    if ($i -lt 10)

  8. Open the script block for the if statement. Assign the value of 0 to the variable $intPad. This is shown here:

    {$intPad=0

  9. Use the New-Item cmdlet to create a new folder. The new folder will be created in the C:\Mytest directory. The name of the new folder will comprise the $strPrefix constant "testFolder", the number 0 from the $intPad variable, and the number contained in the $i variable. The code that does this is shown here:

    new-item -path c:\mytest -name $strPrefix$intPad$i -type directory}

  10. Add the else clause. This code is shown here:

    else

  11. The else script block is the same as the if script block, except it does not include the 0 in the name that comes from the $intPad variable. Copy the New-Item line of code from the if statement and delete the $intPad variable from the name argument. The revised line of code is shown here:

    {new-item -path c:\mytest -name $strPrefix$i -type directory}

  12. Increment the value of the $i variable by 1. To do this, use the double plus symbol (++) operator. The code that does this is shown here:

    $i++

  13. Close the script block for the else clause and add the until statement. The condition that until will evaluate is if the $i variable is equal to the value contained in the $intFolders variable + 1. The reason for adding 1 to $intFolders is so the script will actually create the same number of folders as are contained in the $intFolders variable. Because this script uses a do …until loop and the value of $i is incremented before entering the until evaluation, the value of $i is always 1 more than the number of folders created. This code is shown here:

    }until ($i -eq $intFolders+1)

  14. Save your script as yourname CreateMultipleFolders.ps1. Run your script. You should see 10 folders created in the C:\Mytest directory. If you do not, compare your results with the  CreateMultipleFolders.ps1 script in the scripts folder for this chapter. This concludes this step-by-step exercise.

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