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How to Use PowerShell to Check If A File Exists
In this Itechguide, Victor teaches you how to utilise PowerShell to check if a file exists. The guide covers multiple examples to apply PowerShell to bank check if a file exists.
To use PowerShell to check if a file exists, you utilise the Test-Path Cmdlet. However, you can either enter the file path direct to the Exam-Path command or save the file in a variable. Then use the variable in Test-Path.
How to Employ PowerShell To Cheque If A File Exists Without A Variable
This department section teaches yous how to run Examination-Path command without a variable.
You tin run Examination-Path every bit a stand-lone command. Moreover, y'all can also combine the command with an IF argument to perform additional tasks based on the result of the Test-Path command.
How To Run Test-Path Direct Without A Variable
This sub-section teaches you how to run Test-Path solitary (without using the result in an IF statement).
I have a file called processes.txt in E:\reports.
To check if the file exists, enter the control below in PowerShell and press enter
Test-Path -Path E:\reports\processes.txt
When I pressed, PowerShell returned True, pregnant that the file exists.
However, if I run the same command for a file that does not exists, PowerShell returns False.
How to Combine Test-Path And IF Statement Without A Variable
Equally I mentioned earlier, afterwards using PowerShell Test-Path to check if a file exists, you can use the event in an IF statement to perform additions tasks.
In this example, I will cheque if "Due east:\reports\processes.txt" exists and if information technology exists, I will copy the file to "C:\reports". Here is the script that will do the job.
If (Examination-Path -Path E:\reports\processes.txt ) { Copy-Particular -Path E:\reports\processes.txt -Destination C:\reports } Here is the upshot in PowerShell ISE and the file copied in C:\reports
I can brand the script smarter by adding ii additional lines.
Write-Host "file copied"
and….
Else { Write-Host "file does not exist" } The get-go command above displays a bulletin if the file is copied. The 2d displays a bulletin that the file does not exist.
Here is the modified script…
If (Exam-Path -Path E:\reports\processes.txt ) { Copy-Item -Path E:\reports\processes.txt -Destination C:\reports Write-Host "file copied" } Else { Write-Host "file does not be" } 
How To Use PowerShell To Check If A File Exists With A Variable
In the last section I showed you lot how to use PowerShell to bank check if a file exists without using variables. In this section, I will relieve the event of Test-Path in a variable. Then, use the variable in an IF statement.
In the example in this section, I want to check if starting time-file.txt exists in the path shown in the image below. So, if information technology exists, I will copy the file to "C:\PS"
In the first steps, I will run the command below:
$fileexists = Test-Path -Path East:\reports\start-file.txt
This command is the same equally the final one with one difference – the result of the command is saved in the fileexists variable.
How To Utilise PowerShell To Check If A File Exists And Re-create It
When I introduced this section, I saved the output of the Test-Path command to the fileexists variable.
$fileexists = Test-Path -Path E:\reports\first-file.txt
In this subsection, I will teach you how to copy the file if it exists. To exercise this, I will introduce the IF statement with the Re-create-Item command.
If ($fileexists ) { Copy-Item -Path E:\reports\first-file.txt -Destination C:\PS } Here is the full script with the combined commands:
$fileexists = Exam-Path -Path E:\reports\outset-file.txt If ($fileexists ) { Copy-Item -Path Eastward:\reports\offset-file.txt -Destination C:\PS } And here is the script in PowerShell ISE.
How To Use PowerShell To Check If A File Exists And Delete It
In the last sub-section, you saw how to check if a file exists and copy the file. What if you want to copy the file instead?
If you want to delete the file instead of copying it, replace the Re-create-Item command with the Remove-Detail command.
Hither is the updated script that uses PowerShell "IF" statement to check if a file exists. And then, if it exists, delete it…
$fileexists = Examination-Path -Path E:\reports\first-file.txt If ($fileexists ) { Remove-Item -Path E:\reports\first-file.txt -Strength } How To Use PowerShell To Check If A File Exists Else Go out
In some PowerShell scripting situations, you lot may want to check if a file exists. Then, if it exists, perform a specified job – like copy or delete the file – otherwise, exit the script.
To achieve this, all you demand to do is add the Else block of the If statement.
In the concluding sub-section, I used this script to delete a file if it exists.
$fileexists = Examination-Path -Path Eastward:\reports\first-file.txt
If ($fileexists ) {
Remove-Item -Path E:\reports\kickoff-file.txt -Force
}
If I want the script to get out if the file does not exist, I will modify the script as shown beneath…
$fileexists = Test-Path -Path East:\reports\first-file.txt If ($fileexists ) { Remove-Detail -Path E:\reports\first-file.txt -Force } Else { Break } Here is the logic of the modified script…
Cheque if the file, Eastward:\reports\first-file.txt exists. If information technology exists, delete the file.
However, if the file does not exist, run the control in the Else cake of the If argument. In this example, the control in the Else loop is the word, Break.
"Break" tells PowerShell to stop processing the script. You may also add Interruption on the "If" block of the argument – beneath the Remove-Item control…
$fileexists = Examination-Path -Path E:\reports\first-file.txt If ($fileexists ) { Remove-Item -Path East:\reports\starting time-file.txt -Force Pause } How To Employ PowerShell To Cheque If A File Exists And Not Empty
This is nevertheless some other status common in PowerShell scripting – checking if a file exists and not empty. This may be applicable for log files.
For case, if y'all have an application that creates and updates log files, you may write a PowerShell script that checks that new log files are updated.
Moving on, to test if a file exists, you utilise the Examination-Path command. Yet, to bank check if the file is empty, you demand to innovate another command, Get-ChildItem.
In this scenario, you tin use the Become-ChildItem command in 2 means.
ane, if you desire to check if a single file is empty, you tin run Get-ChildItem control, using the full file path as the Path parameter. two, alternatively, if you want to check a bunch of files in a folder, use the folder path every bit the Path parameter.
In this section, I will give an instance that checks if a specific file exists and is empty. I volition cover the second option in the How To Utilise PowerShell To Bank check If A File Exists An A Binder section after in this guide.
In this instance, I want to bank check if the file, first-file.txt and if it is empty.
As I mentioned earlier, the commencement step is to run the Go-ChildItem control, using the full file path equally the Path parameter. To brainstorm, run the command below…
Get-ChildItem -Path E:\reports\first-file.txt
Hither is the result of the command. From the result of the command, you can see that the file has a property called Length.
Finer, the Length property of a file shows the size of the file. Moreover, if a file is empty, the Length will be zero (0).
So, to utilize PowerShell to cheque if is Not empty, nosotros volition check if the Length is Not zero (0).
To achieve this, I will modify the concluding command every bit shown below…
(Become-ChildItem -Path E:\reports\first-file.txt).Length -ne "0"
Here is the result of the command in PowerShell. In this example, considering the size of my file is 0 (empty), the command returned faux.
This ways that this file is empty.
But how do we include the bit that tests if the file exists? Glad you asked!
To introduce the logic that uses PowerShell to checks if a file exists and besides check that the file is NOT empty, I will combine parts of our previous script and the Get-ChildItem command above.
Hither is my modified script…
$fileexists = Examination-Path -Path E:\reports\first-file.txt $checkiffileisempty = (Get-ChildItem -Path Due east:\reports\first-file.txt).Length -ne "0" If (($fileexists -eq $True) -and ($checkiffileisempty -eq $False)) { Set up-Content -Path E:\reports\first-file.txt -Value "This will add some text for this file" } In this modified version of the script, I made the following changes…
- In line 2, I saved the Get-ChildItem command that checks if a file is empty – in a variable called $checkiffileisempty.
$checkiffileisempty = (Get-ChildItem -Path Eastward:\reports\starting time-file.txt).Length -ne "0"
- And so, in line three I added some other condition to the If argument. The condition part of the If the statement was updated to "If (($fileexists -eq $Truthful) -and ($checkiffileisempty -eq $Faux))".
This condition tests if what is saved in $fileexists is True (file exists). Furthermore, it checks if what is saved in $checkiffileisempt is False (file is empty).
Effectively, PowerShell checks if the Test-Path command that checked if the file path exists is Truthful. Additionally, it also checks if the Become-ChildItem command that checks if the file is NOT empty is False (meaning that the file is empty)
- Finally, if both conditions are met, in line 4, PowerShell will execute the command in the {} bracket of the "If" statement.
In this instance, I accept this command in the {} subclass of the "If" argument.
Set-Content -Path E:\reports\first-file.txt -Value "This will add some text for this file"
The command adds the text in the Value parameter of Gear up-Content command.
To test that the script works, copy it to PowerShell ISE and run the script…
Once I ran the script, the file, showtime-file.txt – that was previously empty – now has some values in it. Additionally, the file size is no longer zero (0)!
How To Apply PowerShell To Bank check If A File Exists In A Binder
And so far this guide has covered multiple scenarios to use PowerShell to check if a file exists.
In this department, I want to dive deep into folders. Specifically, y'all volition larn how to bank check if a file exists in the current folder or in all subfolders.
Additionally, you will learn how to employ PowerShell to cheque if a file exists in multiple folders. Finally, I will show y'all how to apply a wildcard to check if a file exists.
How To Employ PowerShell To Cheque If A File Exists In The Current Folder
In this first case, you will learn how to cheque if a file exists in the current folder – excluding all subfolders.
In this example, I want to bank check if files with the ".log" file extension exist in the "E:\reports" folder. However, I want to exclude all subfolders.
The first step is to run the Get-ChildItem command. Then, pipage the output to Where-Object and filter past PSIsContainer property.
The PSIsContainer holding is a property that defines folders or directories. In the Where-Object control, I specified "$_.PSIsContainer -ne $true". This command simply says "Do not return whatever item if its PSIsContainer property is True. This volition return just files.
Hither is the command…
Go-ChildItem E:\reports | Where-Object {$_.PSIsContainer -ne $true} And hither is the upshot in PowerShell…
The final step is to return the full path of all files with the ".log" extension in the current folder.
Here is the command…
Become-ChildItem E:\reports | Where-Object { ($_.PSIsContainer -ne $true) -and ($_.Extension -eq ".log")} | Select-Object FullName And the result…
From this betoken, if you want to perform further tasks on the files, yous can piping the output of the terminal upshot into a ForEach loop. And so, within the ForEach loop, you can run additional commands.
How To Use PowerShell To Check If A File Exists In Subfolders
If you want to check if a specific file or files exists in all subfolders, non on the current binder, you demand to make slight changes to the Get-ChildItem command.
Specifically, when you pipage the Get-ChildItem control, into Where-Object, you filter Where-Object to return only folders.
(Get-ChildItem E:\reports | Where-Object {$_.PSIsContainer}).FullName The control returns the total path to all the subfolders in the specified folder…
In the next step, you lot need to utilise ForEach statement to iterate through all the folders returned by the last command. And so, within the ForEach statement, run some other Get-ChildItem command against each subfolder.
There are three variants of ForEach but, in this example, I will use the ForEach-Object Cmdlet.
(Go-ChildItem E:\reports | Where-Object {$_.PSIsContainer}).FullName | ForEach-Object { Get-ChildItem $_ | Where-Object { ($_.Extension -eq ".log")} | Select-Object Directory, FullName } The command displays all log files in the subfolders…
How To Use PowerShell To Bank check If A File Exists Electric current Folder And All Subfolders
In the concluding two sub-sections, I used the PSIsContainer holding to either filter out subfolders, or return merely subfolders. In this case, I will eliminate the PSIsContainer property.
However, I will introduce a Get-ChildItem control parameter, called Recurse. The Recurse parameter forces Get-ChildItem to check the specified folder and all its subfolders.
Here is modified script.
(Become-ChildItem E:\reports -Recurse).FullName | ForEach-Object { Go-ChildItem $_ | Where-Object { ($_.Extension -eq ".log")} | Select-Object Directory, FullName } The Recurse parameter is introduced in the beginning Get-ChildItem command. It is not required in the second Become-ChildItem command (within the ForEach-Object block).
Hither is the effect of the command. This fourth dimension, the report includes all log files in the top folder and all its subfolders.
How To Use PowerShell To Check If A File Exists In A Remote Computer
If you want to test if a file exists on a remote computer, you lot can apply the same principle discussed in all the examples in this guide.
Nonetheless, you demand to introduce a new command chosen Invoke-Command. Then, within the Invoke-Control command, use its ScriptBlock parameter to specify one of the commands nosotros discussed earlier in this guide.
Another important thing to note is that, you may need to specify a user proper name and password for an account with the permission to connect to the remote calculator.
Additionally, the specified account should have the permission to run the control in the ScriptBlock parameter – on the remote calculator.
Finally, utilise the ComputerName parameter to specify the name of the remote computer.
For your reference, here is the full general syntax of the Invoke-Command command.
Invoke-Command -ComputerName -Credential -ScriptBlock {Exam-Path} To read more nigh the Invoke-Command command, come across "References and Further Reading" at the stop of this guide.
If hope I was able to successfully teach yous how to use PowerShell to check if a file exists!
I also hope y'all found the Itechguide helpful. If you lot constitute it helpful, kindly voteYesto the "Was this mail Helpful" question below.
Alternatively, you could ask a question, leave a annotate or provide feedback with the "Leave a Reply" form found at the end of this folio.
Finally, for more E-mail tech Itechguides, visit our Windows PowerShell how-to page. You may also detect our Work from Home page very helpful.
References and Further Reading
- Invoke-Command
- Powershell If Else Explained: Syntax and Examples
- Become-ChildItem
- Examination-Path
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