c# barcode zebra printer Cmdlet Write-Warning in Visual Basic .NET

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Cmdlet Write-Warning
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Write-Verbose
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Write-Debug
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$DebugPreference (SilentlyContinue by default)
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Write-Error
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$ErrorActionPreference (Continue by default)
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Write-Error works a bit differently because it actually writes an error to PowerShell s
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error stream. 22 will discuss errors in a bit more detail, and will provide more information on how $ErrorActionPreference can be used. There s also a Write-Progress cmdlet that can display progress bars, but it works entirely differently. Feel free to read its help for more information and for examples, but we won t be covering it in this chapter. To use any of these cmdlets, first make sure that its associated configuration variable is set to Continue. If it s set to SilentlyContinue, which is the default for a couple of them, you won t see any output at all. Then, use the cmdlet to output a message. Note that some PowerShell hosting applications may display the output from these cmdlets in a different location. In PrimalScript, for example, debugging text is written to a different output pane than the script s main output, so that the debug text can be more easily separated for analysis. You ll see more about Write-Debug in chapter 23.
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16.6 Lab
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Write-Host and Write-Output can be a bit tricky to work with. See how many of these
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tasks you can complete, and if you get completely stuck, it s okay to peek at the sample answers available on MoreLunches.com.
1 2 3
Use Write-Output to display the result of 100 multiplied by 10. Use Write-Host to display the result of 100 multiplied by 10. Prompt the user to enter a name, and then display that name in yellow text.
Input and output
Prompt the user to enter a name, and then display that name only if it s longer than 5 characters. Do this all in a single line don t use a variable.
That s all for this lab. Because these cmdlets are all pretty straightforward, I want you to spend some more time experimenting with them on your own. Be sure to do that there are some ideas in the next section.
16.7 Ideas for on your own
Spend some time getting comfortable with all of the cmdlets in this chapter. Make sure you can display verbose output, accept input, and even display a graphical input box. You ll be using the commands from this chapter a lot from here on out, so you should read their help files and even jot down a quick syntax reminder for future reference.
You call this scripting
So far, you could have accomplished everything in this book using PowerShell s command-line interface. You haven t had to write a single script. That s a big deal for me, because I see a lot of administrators initially shy away from scripting, (rightly) perceiving it as a kind of programming, and (correctly) feeling that learning it can sometimes take more time than it s worth. Hopefully, you ve seen how much you can accomplish in PowerShell without having to become a programmer. But at this point, you may also be starting to feel that constantly retyping the same commands, over and over, is going to become pretty tedious. You re right, so in this chapter we re going to dive into PowerShell scripting but we re still not going to be programming. Instead, we re going to focus on scripts as little more than a way of saving our fingers from unnecessary retyping.
17.1 Not programming more like batch files
Most Windows administrators have, at one point or another, created a commandline batch file (which usually have a .BAT or .CMD filename extension). These are nothing more than simple text files that you can edit with Windows Notepad, containing a list of commands to be executed in a specific order. Technically, you call those commands a script because, like a Hollywood script, they tell the performer (your computer) exactly what to do and say, and in what order to do and say it. But batch files rarely look like programming, in part because the Cmd.exe shell has a very limited language that doesn t permit incredibly complicated scripts. PowerShell scripts or batch files, if you prefer work similarly. Simply list the commands that you want to run, and the shell will execute those commands in the order specified. You can create a script by simply copying a command from the host window and pasting it into Notepad. Of course, Notepad is a pretty horrible text
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