Powershell run exe asynchronously

Many of my Windows systems administrator friends know that they can run commands such as the following successfully from a PowerShell console session:. See here:.

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On my system, I use the free and open-source 7-Zip utility for my file archiving and expansion needs. PowerShell can execute an exe, but you need to be explicit in your instructions. NET Framework by using the [ Environment ] type accelerator:. Sublime Text is my favorite text editor, and I can run the program on my workstation by running the following two lines of PowerShell code:. PowerShell politely runs executables that exist inside search path directories, as previously discussed.

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The problem in the above example is that PowerShell has no earthly idea that subl. As far as the PowerShell parser is concerned, we simply defined an anonymous string. Fair enough. But have you ever tried to run an external command in PowerShell that used arguments? The following approach, though much more formal, also works. Here, we define variables for each external command element, and then plug the variables into our call:. The last method I want to show you involves splatting.

In splatting, we pass a hash table into a command and PowerShell spreads out the hash table contents to be used as parameters. To do this, we first create a hash table that contains our arguments and their values:. Join the 4sysops PowerShell group! Your question was not answered?

Ask in the forum! Thanks for the concise guide; using external executables in PoSH is kind of tricky, so this is rather helpful. Hi AceyMan. You're right of course--thanks for pointing it out. I'll submit a change request immediately. Peace, Tim. Thank you so much!

Running PowerShell scripts as real Windows Applications!

I was looking for a way to save the executable directory into powershell so I call call it later without navigating to it's directory. Thanks for sharing the wonderful content. I am getting error while executing an exe file for sQL server patch on remote computer using invoke-command. The command runs without any error but do not start the patching process. Your email address will not be published. Notify me of followup comments via e-mail. Receive new post notifications.

Member Leaderboard — Month.The most frequent kind of PowerShell function is a function that executes code and, when finished, returns control back to the console. This is called synchronous code.

This means further code execution will not continue until that function's execution is complete. There are those times when the code inside of your function may take a while, and you don't feel like waiting around until it's done.

In this case, you need to build functions that immediately return control but continue running a thread in the background. Not all functions lend themselves to run in this manner.

Use PowerShell to execute an exe

For example, if you have other code that depends on the output of the function, it must remain synchronous. Suitable candidates are operations that you don't have to get the results of the function to run your script s successfully.

I use asynchronous functions to clean up Azure VMs, for example. The process takes up to 5 minutes because it must bring down the VM, remove the VM and clean up all of the attached disks. It's much easier to simply have my custom function return a background job object and monitor that when I have time. Asynchronous functions can be written in a few different ways; workflows, parallel runspaces, and jobs to name a few.

Each has its advantages and disadvantages. However, I typically use jobs to run asynchronous code. I do this because they're typically easy to manage and are intuitive to me. Let's say I have a need for a function that removes an Azure virtual machine. Within this function, I need to remove the VM, which takes a few minutes and does some other cleanup tasks.

I want to build a function that allows me to return a background job object but also give the user the option to wait for the function if they need to. Always give the option to wait just in case there might be a time when you develop a script that might require that functionality. To build a function around this to run in the background, I'll need to build it to support the parameters that Remove-AzVm needs so Name and ResourceGroupName.

I now have a simple proxy function that passes two parameters to the Remove-AzVm cmdlet. This works, but it's not much good because it's running synchronously. We need to implement PowerShell job support but also give the user the option to run it synchronously if they want. To do this, we'll need to put our code into a scriptblock. This allows us to not only pass it to Start-Job but also just to execute it if the user wants to wait for the operation to complete.

Since Remove-AzVm requires some parameters from the function, we must also add these parameters to the scriptblock as well. Once the code is in the scriptblock, you can then simply pass it to Start-Joband you're off to the races! Just be sure to pass in the arguments as necessary.

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Since the code is in a scriptblock, we can now also execute this on its own by using the ampersand and passing in the parameters again. So we've now got both ways to execute the code. All we need to do now is provide a way for the function to specify which one we want.

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By default, I want the code to be executed in a background job, but I want the option to execute it synchronously if need be.

A great way to implement this functionality is to use the Wait parameter as a switch type. This allows me to quickly "turn on" synchronous behavior if I need to.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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It only takes a minute to sign up. If I have a script that I need to run against multiple computers, or with multiple different arguments, how can I execute it in parallel, without having to incur the overhead of spawning a new PSJob with Start-Job? As an example, I want to re-sync the time on all domain memberslike so:. But I don't want to wait for each PSSession to connect and invoke the command. How can this be done in parallel, without Jobs?

Update - While this answer explains the process and mechanics of PowerShell runspaces and how they can help you multi-thread non-sequential workloads, fellow PowerShell aficionado Warren 'Cookie Monster' F has gone the extra mile and incorporated these same concepts into a single tool called Invoke-Parallel - it does what I describe below, and he has since expanded it with optional switches for logging and prepared session state including imported modules, really cool stuff - I strongly recommend you check it out before building you own shiny solution!

powershell run exe asynchronously

This greatly reduces the overall execution time from the issuers perspective, but connecting to each machine is still done in sequential order. Connecting to thousands of clients in sequence may take a long time depending on the number of machines that are for one reason or another inaccessible, due to an accumulation of timeout waits.

To get around having to queue up all subsequent connections in case of a single or a few consecutive timeouts, we can dispatch the job of connecting and invoking commands to separate PowerShell Runspaces, executing in parallel.

Like the original problem, the job of invoking commands multiple runspaces can be broken down into:. PowerShell has a type accelerator called [RunspaceFactory] that will assist us in the creation of runspace components - let's put it to work.

The two arguments passed to CreateRunspacePool1 and 8 is the minimum and maximum number of runspaces allowed to execute at any given time, giving us an effective maximum degree of parallelism of 8. An instance of PowerShell is not the same as the powershell. We can use the [powershell] type accelerator to create a new PowerShell instance within PowerShell:.

Using what is known in. NET development terminology as the Asynchronous Programming Modelwe can split the invocation of a command into a Begin method, for giving a "green light" to execute the code, and an End method to collect the results. Since we in this case are not really interested in any feedback we don't wait for the output from w32tm anywayswe can make due by simply calling the first method.

Using the above technique, we can wrap the sequential iterations of creating new connections and invoking the remote command in a parallel execution flow:. Assuming that the CPU has the capacity to execute all 8 runspaces at once, we should be able to see that the execution time is greatly reduced, but at the cost of readability of the script due to the rather "advanced" methods used.

We could easily create a RunspacePool that allows for the execution of a runspaces at the same time:. But at the end of the day, it all comes down to how many units of execution our local CPU can handle. In other words, as long as your code is executing, it does not make sense to allow more runspaces than you have logical processors to dispatch execution of code to.

If, on the other hand, the code you are executing itself incurs a lot of wait time due to external factors like network latency, you can still benefit from running more simultanous runspaces than you have logical processors, so you'd probably want to test of range possible maximum runspaces to find break-even :. Adding to this discussion, what's missing is a collector to store the data that is created from the runspace, and a variable to check the status of the runspace, i.

Check out PoshRSJob. In theory threads should be limited by the number of system processors. Thus why that module has a -MaxThreads input parameter. Keep in mind that allocating too many threads will hinder performance. Getting data back from the ScriptBlock is tricky. I made some changes to the OP script based on my experience working with the Active Directory cmdlets. Sign up to join this community.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I have a command that I have build and stored in a variable in PowerShell. This command works if I do a Write-Host and copy and paste into a standard cmd. It works fine for me. Assume 7z. I usually prefer the way with a parameter array because it is easier to compose programmatically than to build an expression for Invoke-Expression.

Learn more. Executing a command stored in a variable from PowerShell Ask Question. Asked 9 years, 7 months ago. Active 4 months ago. Viewed k times. How do I execute this command from inside my script? I have tried several combination of Invoke-Command or Invoke-Expression with no luck. Peter Mortensen Travis Travis 2, 5 5 gold badges 19 19 silver badges 20 20 bronze badges.

Active Oldest Votes. Steven Penny 1. Roman Kuzmin Roman Kuzmin That is great. It is starting to come together now. Do i need to place it is "" or ''? Good Luck Akash 9, 4 4 gold badges 58 58 silver badges 52 52 bronze badges.

powershell run exe asynchronously

Tells me The term '7z. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. Travis: Oops. I updated the post with a solution for your command. I have tried invoke-expression before and it has not worked.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Building Asynchronous PowerShell Functions

The script runs quickly until the remote directory data must be obtained using FTP. It would be desirable to remove the remote directory data retrieval into a different PowerShell script 2.

This SO post explains launching a script from within a script. But it seems in this case the first script is suspended while the second script executes. How can I code script 1 so that script 2 is launched and forgotten and script 1 continues and completes quickly leaving script 2 to finish in the background. You can use Start-Job to starts a PowerShell background job. This way the job runs without interacting with the current session and will return immediately while the job is running asynchronously.

If you expect receiving a result from the job, you can use Receive-Job to get the result. You can also use Start-Process to start another process.

You can specify a program executable file or script file, or a file that can be opened by using a program on the computer. When you start process for a non-executable file, the program associated to that file type will run like when you use Invoke-Item cmdlet.

You would have a single script with multiple functions. The script is a standard ps1 script. The use-case here is you are executing blocks of code that do effectively a single task and you get to decide which blocks to execute at which stage of the script execution:.

Here I am calling the first function within the second function. You can insert your script logic as you like here.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. When PowerShell sees a command starting with a string it just evaluates the string, that is, it typically echos it to the screen, for example:.

When you invoke an EXE file like this with complex command line arguments it is usually very helpful to have a tool that will show you how PowerShell sends the arguments to the EXE file.

The PowerShell Community Extensions has such a tool. It is called echoargs. You just replace the EXE file with echoargs - leaving all the arguments in place, and it will show you how the EXE file will receive the arguments, for example:. It turns out I was trying too hard before to maintain the double quotes around the connection string.

Apparently that isn't necessary because even cmd. BTW, hats off to the PowerShell team. If this is an area of pain for you, then please vote up this PowerShell bug submission.

See this blog post for details. It's basically the same as Akira's answer, but this works if you dynamically build your command parameters and put them in a variable.

Just put paths or connection strings in one array item and split the other things in one array item each. But they are considered unsafe. Microsoft recommends using Start-Process. By default Windows PowerShell opens a new window. I didn't try adding the "computername" part at the end of the command line, but hopefully this info will help others reading this now get closer to their desired result. The web is full of command lines written for Cmd. This seemed to be the source of many minor headaches.

We do expand environment variables if you use Cmd. Other than that, the arguments up to the end of the line or pipe, if you are piping are passed as is. Here is an example:. The key thing to note here is that FilePath must be in position 0, according to the Help Guide. I tried all of the suggestions but was still unable to run msiexec. So my solution ended up using System. ProcessStartInfo :. This is also completion of the only workaround to the MS connect issue that -File does not pass-back non-zero return codes and -Command is the only alternative.

But until now it was thought a limitation of -Command was that it didn't support spaces. I've updated that feedback item too. An alternative answer is to use a Base64 encoded command switch:. When decoded, you'll see it's the OP's original snippet with all arguments and double quotes preserved.

You can run exe files in powershell different ways. For instance if you want to run unrar. If you want to call simply a winrar archived file as.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a PowerShell 1. The first is a virtual machine and the others are development applications.

powershell run exe asynchronously

I want the virtual machine to finish booting before the rest of the applications are opened. Normally, for internal commands PowerShell does wait before starting the next command. One exception to this rule is external Windows subsystem based EXE. The first trick is to pipeline to Out-Null like so:.

PowerShell will wait until the Notepad. That is nifty but kind of subtle to pick up from reading the code. You can also use Start-Process with the -Wait parameter:.

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Besides using Start-Process -Waitpiping the output of an executable will make Powershell wait. Here is a long list of some other output options. It seems we have to be more verbose with Powershell. Some programs can't process output stream very well, using pipe to Out-Null may not block it.

And Start-Process needs the -ArgumentList switch to pass arguments, not so convenient. There is also another approach. Including the option -NoNewWindow gives me an error: Start-Process : This command cannot be executed due to the error: Access is denied. There's always cmd. It may be less annoying if you have trouble quoting arguments to start-process:. Learn more. How to tell PowerShell to wait for each command to end before starting the next? Ask Question. Asked 10 years, 5 months ago.


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