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##[error]Script failed with error: Error: Unable to locate executable file: ‘pwsh’.

In AzureCLI@2 you may choose from a variety of options when it comes on how this task will be executed on the agent machine. I usually choose powershell for windows machines and powershell core for Unix based machines (pwsh).

Recently I got an error on a Windows machine when using Powershell core. The latest version of powershell which is currently on 7.* version can be used as pscore in the AzureCLI@2 task.

      - task: AzureCLI@2
        displayName: az cli task
        inputs:
          azureSubscription: 'SERVICE-CONNECTION'
          scriptType: 'pscore'
          scriptLocation: 'inlineScript'
          inlineScript: |
           script

Error message:

##[error]Script failed with error: Error: Unable to locate executable file: ‘pwsh’. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also verify the file has a valid extension for an executable file.

Solution:

In order to bypass this problem you should make sure that the latest version of powershell which is multiplatform should be installed on your system. At the time of this article this version is 7.*

After installing powershell you should make a restart also on the machine in order for the environmental variables to be added on PATH. Then you can execute your pwsh tasks on your agent machines.

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Install azure cli using Powershell – silent mode

Az cli is a very important tool that one devops engineer may need to install on systems. You can perform a silent install on a windows machine using the powershell below:

$msiFilePath = "azure-cli.msi"
Invoke-WebRequest https://aka.ms/installazurecliwindows -OutFile $msiFilePath
             
$MSIArguments = @(
    "/i"
    ('"{0}"' -f $msiFilePath)
    "/qn"
    "/norestart"
)               
Start-Process "msiexec.exe" -ArgumentList $MSIArguments -Wait -NoNewWindow
Remove-Item -Path $msiFilePath  -Force

By running the powershell the download procedure will begin.

When the installation finishes you can locate it under installed programs:

https://docs.microsoft.com/en-us/cli/azure/install-azure-cli-windows?tabs=azure-cli

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Authenticate to Azure management API using az cli

A quick an easy way to authenticate on Azure management API is to use az cli get-access-token command and use this as a Bearer token on your API calls.

Given that you want to access https://management.azure.com/subscriptions/api you can use:

$token =  az account get-access-token | ConvertFrom-Json

You can then get the access token with $token.accesstoken

Finally you can use this token as a Bearer token on your API calls

$headers = @{ Authorization = "Bearer $token.accesstoken" }