Get all PowerShell or pwsh processes running on your computer.

Get-PSProcess.ps1

#requires -version 5.1
#requires -module CIMCmdlets

Function Get-PSPowerShell {
    <#
    .Synopsis
    Get all PowerShell processes.
    .Description
    Get all PowerShell or pwsh processes on your computer. The command will default
    to the same PowerShell process as your console, but you can specify either one.
    The command writes a custom object to the pipeline with custom formatting. If
    you are running in a console host, the default formatting will use ANSI escape
    sequences to highlight details.
    .Parameter Name
    Specify either powershell.exe or pwsh.exe. The default is your current process.
    .Parameter Exclude
    Exclude the current PowerShell or pwsh process.
    .Example
    PS C:\> Get-PSPowerShell -exclude

    Get all processes that are the same as the current host, but exclude the current
    process.
    .Example
    PS C:\> Get-PSPowerShell powershell.exe | Format-Table

    Use the default table view. The process ID of the current process will be shown
    in Green. If the Owner is other than the current user, it will be shown in Red.
    .Example
    PS C:\> Get-PSPowerShell pwsh.exe | Format-Table -view cmd

    Use an alternate table view.
    .Notes
    The command has an alias of gpsp.
    Learn more about PowerShell: http://jdhitsolutions.com/blog/essential-powershell-resources/.
    .Link
    Get-Process
    .Link
    Get-CimInstance
    #>

    [cmdletbinding()]
    [alias("gpsp")]
    [Outputtype("PowerShellProcess")]
    Param(
        [Parameter(Position = 0, HelpMessage = "Specify PowerShell or Pwsh. The default is your current engine.")]
        [ValidateSet("powershell.exe", "pwsh.exe")]
        [string]$Name = $(Split-Path (Get-Process -Id $pid).path -Leaf),
        [Parameter(HelpMessage = "Exclude the current PowerShell or pwsh process.")]
        [switch]$Exclude
    )

    Write-Verbose "Starting $($MyInvocation.MyCommand)"
    Write-Verbose "Getting all $name processes."
    #define a CIM Filter
    $filter = "Name='$Name'"

    if ($Exclude) {
        #expand the filter
        Write-Verbose "Excluding current $name process $pid."
        $filter += " AND ProcessID != $pid"
    }

    <#
    a hashtable of parameter values that will be splatted to Get-CimInstance
    limiting CIM properties to squeeze out a bit more performance. If I am
    not going to use a property, why get it?
    #>
    $splat = @{
        Classname = "Win32_Process"
        Filter    = $filter
        Property  = "ProcessID", "HandleCount", "CommandLine", "ParentProcessID", "CreationDate","WorkingSetSize","Name"
    }

    Write-Verbose "Getting process data"
    $items = Get-CimInstance @splat

    if ($items) {
        Write-Verbose "Found $($items.count) matching processes"

        #create a list object to temporarily store the results
        $results = [System.Collections.Generic.list[object]]::New()

        foreach ($item in $items) {
            Write-Verbose "Processing id $($item.processId)"
            #get owner
            $owner = Invoke-CimMethod -InputObject $item -MethodName GetOwner
            $parent = Get-Process -Id $item.ParentprocessID
            $r = [PSCustomObject]@{
                PSTypename      = "PowerShellProcess"
                ProcessID       = $item.ProcessID
                Name            = $item.Name
                Handles         = $item.HandleCount
                WorkingSet      = $item.WorkingSetSize
                ParentProcessID = $item.ParentProcessID
                ParentProcess   = $parent.Name
                ParentPath      = $parent.Path
                Started         = $item.CreationDate
                Owner           = "$($owner.Domain)\$($owner.user)"
                CommandLine     = $item.Commandline
            }
            #add each custom object to the list
            $results.Add($r)
        }

        #sort results and write to the pipeline
        #I'm sorting so that my custom formats work as designed
        $results | Sort-Object -Property Commandline, Started
    }
    Else {
        Write-Warning "No $name processes found."
    }

    Write-Verbose "Ending $($MyInvocation.MyCommand)"
}

#add some type extensions to the custom object output
Update-TypeData -TypeName PowerShellProcess -MemberType ScriptProperty -MemberName Runtime -Value { (Get-Date) - $this.Started } -Force
Update-TypeData -TypeName PowerShellProcess -MemberType AliasProperty -MemberName ID -Value ProcessID -Force
Update-TypeData -TypeName PowerShellProcess -MemberType AliasProperty -MemberName WS -Value WorkingSet -Force
Update-TypeData -TypeName PowerShellProcess -MemberType AliasProperty -MemberName cli -Value Commandline -Force

#load the custom format file which should be in the same folder as this file
Update-FormatData $PSScriptRoot\powershellprocess.format.ps1xml

<#
MIT License

Copyright (c) 2021 JDH Information Technology Solutions, Inc.


Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:


The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.


THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
#>

powershellprocess.format.ps1xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Format type data generated 04/12/2021 13:56:07 by PROSPERO\Jeff

This file was created using the New-PSFormatXML command that is part
of the PSScriptTools module.
https://github.com/jdhitsolutions/PSScriptTools

Load this file with Update-FormatData
-->
<Configuration>
  <ViewDefinitions>
    <View>
      <!--Created 04/12/2021 13:56:07 by PROSPERO\Jeff-->
      <Name>default</Name>
      <ViewSelectedBy>
      <TypeName>PowerShellProcess</TypeName>
      </ViewSelectedBy>
      <ListControl>
        <ListEntries>
          <ListEntry>
            <ListItems>
              <ListItem>
                <Label>ProcessID</Label>
                <ScriptBlock>
                  <!-- highlight the current process ID using ANSI-->
                if ($host.name -match "console|code" -AND $_.processID -eq $pid) {
                  "$([char]27)[92m$($_.ProcessID)$([char]27)[0m"
                }
                else {
                  $_.ProcessID
                }
                </ScriptBlock>
              </ListItem>
               <ListItem>
                <Label>Name</Label>
                <PropertyName>Name</PropertyName>
              </ListItem>
              <ListItem>
                <Label>Handles</Label>
                <PropertyName>Handles</PropertyName>
              </ListItem>
              <ListItem>
                <Label>WorkingSetMB</Label>
                <ScriptBlock>($_.WorkingSet/1MB) -as [int32]</ScriptBlock>
              </ListItem>
              <ListItem>
                <Label>ParentProcessID</Label>
                <PropertyName>ParentProcessID</PropertyName>
              </ListItem>
              <ListItem>
                <Label>ParentProcess</Label>
                <PropertyName>ParentProcess</PropertyName>
              </ListItem>
              <ListItem>
                <Label>Started</Label>
                <PropertyName>Started</PropertyName>
              </ListItem>
              <ListItem>
                <Label>Owner</Label>
                <!-- Highlight owner if it isn't the current user-->
                <ScriptBlock>
                 if ($host.name -match "console|code" -AND ($_.owner -ne "$env:USERDOMAIN\$env:username" )) {
                    "$([char]27)[91m$($_.Owner)$([char]27)[0m"
                 }
                 else {
                   $_.Owner
                 }
                </ScriptBlock>
              </ListItem>
              <ListItem>
                <Label>CommandLine</Label>
                <PropertyName>CommandLine</PropertyName>
              </ListItem>
              <ListItem>
                <Label>Runtime</Label>
                <ScriptBlock>
                  $r = $_.Runtime.toString()
                  $r.Substring(0,$r.lastindexof("."))
                </ScriptBlock>
              </ListItem>
            </ListItems>
          </ListEntry>
        </ListEntries>
      </ListControl>
    </View>
    <View>
      <!--Created 04/12/2021 14:38:01 by PROSPERO\Jeff-->
      <Name>parent</Name>
      <ViewSelectedBy>
        <TypeName>PowerShellProcess</TypeName>
      </ViewSelectedBy>
      <GroupBy>
        <ScriptBlock>
        @"
$($_.ParentProcess) [$($_.ParentProcessID)]
   Path  : $($_.ParentPath)
"@

        </ScriptBlock>
        <Label>Parent</Label>
      </GroupBy>
      <TableControl>
        <!--Delete the AutoSize node if you want to use the defined widths.
        <AutoSize />-->
        <TableHeaders>
          <TableColumnHeader>
            <Label>ID</Label>
            <Width>8</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Owner</Label>
            <Width>25</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Started</Label>
            <Width>23</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Runtime</Label>
            <Width>12</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Commandline</Label>
            <Alignment>left</Alignment>
          </TableColumnHeader>
        </TableHeaders>
        <TableRowEntries>
          <TableRowEntry>
            <Wrap />
            <TableColumnItems>
              <TableColumnItem>
                  <ScriptBlock>
                  <!-- highlight the current process ID using ANSI-->
                if ($host.name -match "console|code" -AND $_.processID -eq $pid) {
                  "$([char]27)[92m$($_.ProcessID)$([char]27)[0m"
                }
                else {
                  $_.ProcessID
                }
                </ScriptBlock>
              </TableColumnItem>
              <TableColumnItem>
                <!-- Highlight owner if it isn't the current user-->
                <ScriptBlock>
                 if ($host.name -match "console|code" -AND ($_.owner -ne "$env:USERDOMAIN\$env:username" )) {
                    "$([char]27)[91m$($_.Owner)$([char]27)[0m"
                 }
                 else {
                   $_.Owner
                 }
                </ScriptBlock>
              </TableColumnItem>
              <TableColumnItem>
                <PropertyName>Started</PropertyName>
              </TableColumnItem>
              <TableColumnItem>
                <ScriptBlock>
                  $r = $_.Runtime.toString()
                  $r.Substring(0,$r.lastindexof("."))
                </ScriptBlock>
              </TableColumnItem>
                <TableColumnItem>
                <PropertyName>Commandline</PropertyName>
              </TableColumnItem>
            </TableColumnItems>
          </TableRowEntry>
        </TableRowEntries>
      </TableControl>
    </View>
        <View>
      <!--Created 04/12/2021 14:15:24 by PROSPERO\Jeff-->
      <Name>cmd</Name>
      <ViewSelectedBy>
        <TypeName>PowerShellProcess</TypeName>
      </ViewSelectedBy>
      <GroupBy>
        <PropertyName>Commandline</PropertyName>
        <Label>Commandline</Label>
      </GroupBy>
      <TableControl>
        <!--Delete the AutoSize node if you want to use the defined widths
        <AutoSize />.-->
        <TableHeaders>
          <TableColumnHeader>
            <Label>ID</Label>
            <Width>10</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>ParentID</Label>
            <Width>10</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Owner</Label>
            <Width>25</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Started</Label>
            <Width>23</Width>
            <Alignment>left</Alignment>
          </TableColumnHeader>
          <TableColumnHeader>
            <Label>Runtime</Label>
            <Width>12</Width>
            <Alignment>right</Alignment>
          </TableColumnHeader>
        </TableHeaders>
        <TableRowEntries>
          <TableRowEntry>
            <TableColumnItems>
              <TableColumnItem>
                <ScriptBlock>
                  <!-- highlight the current process ID using ANSI-->
                if ($host.name -match "console|code" -AND $_.processID -eq $pid) {
                  "$([char]27)[92m$($_.ProcessID)$([char]27)[0m"
                }
                else {
                  $_.ProcessID
                }
                </ScriptBlock>
              </TableColumnItem>
              <TableColumnItem>
                <PropertyName>ParentProcessID</PropertyName>
              </TableColumnItem>
              <TableColumnItem>
                <!-- Highlight owner if it isn't the current user-->
                <ScriptBlock>
                 if ($host.name -match "console|code" -AND ($_.owner -ne "$env:USERDOMAIN\$env:username" )) {
                    "$([char]27)[91m$($_.Owner)$([char]27)[0m"
                 }
                 else {
                   $_.Owner
                 }
                </ScriptBlock>
              </TableColumnItem>
              <TableColumnItem>
                <PropertyName>Started</PropertyName>
              </TableColumnItem>
              <TableColumnItem>
                <ScriptBlock>
                  $r = $_.Runtime.toString()
                  $r.Substring(0,$r.lastindexof("."))
                </ScriptBlock>
              </TableColumnItem>
            </TableColumnItems>
          </TableRowEntry>
        </TableRowEntries>
      </TableControl>
    </View>
  </ViewDefinitions>
</Configuration>

Put both files in the same directory. Dot source the ps1 file which will also load the custom format file.

These files are explained at https://jdhitsolutions.com/blog/powershell/8321/building-a-powershell-process-detection-tool/