Powershell script to indexof value from array-CodePudding

The below command will print out a list of string

Invoke-Expression -Command "mc.exe admin policy list $target" -OutVariable policiesList | Out-Null

In the powershell script, there is a prompt to enter some value

$option = Read-Host -Prompt "Enter option: "

I wanted to keep prompting the "Read-Host" to capture user value until the value (in $option ) matches in the policiesList. I have tried using the IndexOf, but it returns -1 even though the $option matches one of the value in policiesList

$rr=[array]::IndexOf($policiesList , $option)
echo $rr

The below is my entire script

Invoke-Expression -Command "mc.exe admin policy list $target" -OutVariable policiesList | Out-Null
$option=""
$i=[Array]::IndexOf($policiesList, $option) 
while($i -eq -1){
    $i=[Array]::IndexOf($policiesList, $option) 
    $option = Read-Host -Prompt "Enter option"
}

CodePudding user response：

Note: Invoke-Expression (iex) should generally be avoided; definitely don't use it to invoke an external program or PowerShell script.

Therefore, reformulate your call to mc.exe as follows:

# Saves the output lines as an array in $policies.
$policies = mc.exe admin policy list $target

Note that [Array]::IndexOf() uses case-sensitive lookups, which may be why the lookups don't succeed.
A case-insensitive approach that is also simpler is to use PowerShell's -inoperator. (Note that the comparison value must match an array element in full either way.)

do {
  $option = Read-Host -Prompt "Enter option"
} while ($option -notin $policies)

CodePudding user response：

Try casting the result of Invoke-Expression to an array, as Invoke-Expression returns a PSObject type.

$policiesList = @(Invoke-Expression -Command "mc.exe admin policy list $target")
$option=""
$i=[Array]::IndexOf($policiesList, $option) 
while($i -eq -1){
    $i=[Array]::IndexOf($policiesList, $option) 
    $option = Read-Host -Prompt "Enter option"
}