How can I get the current PowerShell executing file?

If you only want the filename (not the full path) use this:

$ScriptName = $MyInvocation.MyCommand.Name

Try the following

$path =  $MyInvocation.MyCommand.Definition 

This may not give you the actual path typed in but it will give you a valid path to the file.

As noted in previous responses, using "$MyInvocation" is subject to scoping issues and doesn't necessarily provide consistent data (return value vs. direct access value). I've found that the "cleanest" (most consistent) method for getting script info like script path, name, parms, command line, etc. regardless of scope (in main or subsequent/nested function calls) is to use "Get-Variable" on "MyInvocation"...

# Get the MyInvocation variable at script level
# Can be done anywhere within a script
$ScriptInvocation = (Get-Variable MyInvocation -Scope Script).Value

# Get the full path to the script
$ScriptPath = $ScriptInvocation.MyCommand.Path

# Get the directory of the script
$ScriptDirectory = Split-Path $ScriptPath

# Get the script name
# Yes, could get via Split-Path, but this is "simpler" since this is the default return value
$ScriptName = $ScriptInvocation.MyCommand.Name

# Get the invocation path (relative to $PWD)
# @GregMac, this addresses your second point
$InvocationPath = ScriptInvocation.InvocationName

So, you can get the same info as $PSCommandPath, but a whole lot more in the deal. Not sure, but it looks like "Get-Variable" was not available until PS3 so not a lot of help for really old (not updated) systems.

There are also some interesting aspects when using "-Scope" as you can backtrack to get the names, etc. of the calling function(s). 0=current, 1=parent, etc.

Hope this is somewhat helpful.

Ref, https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-variable

I would argue that there is a better method, by setting the scope of the variable $MyInvocation.MyCommand.Path:

ex> $script:MyInvocation.MyCommand.Name

This method works in all circumstances of invocation:

EX: Somescript.ps1

function printme () {
    "In function:"
    ( "MyInvocation.ScriptName: " + [string]($MyInvocation.ScriptName) )
    ( "script:MyInvocation.MyCommand.Name: " + [string]($script:MyInvocation.MyCommand.Name) )
    ( "MyInvocation.MyCommand.Name: " + [string]($MyInvocation.MyCommand.Name) )
}
"Main:"
( "MyInvocation.ScriptName: " + [string]($MyInvocation.ScriptName) )
( "script:MyInvocation.MyCommand.Name: " + [string]($script:MyInvocation.MyCommand.Name) )
( "MyInvocation.MyCommand.Name: " + [string]($MyInvocation.MyCommand.Name) )
" "
printme
exit

OUTPUT:

PS> powershell C:\temp\test.ps1
Main:
MyInvocation.ScriptName:
script:MyInvocation.MyCommand.Name: test.ps1
MyInvocation.MyCommand.Name: test.ps1

In function:
MyInvocation.ScriptName: C:\temp\test.ps1
script:MyInvocation.MyCommand.Name: test.ps1
MyInvocation.MyCommand.Name: printme

Notice how the above accepted answer does NOT return a value when called from Main. Also, note that the above accepted answer returns the full path when the question requested the script name only. The scoped variable works in all places.

Also, if you did want the full path, then you would just call:

$script:MyInvocation.MyCommand.Path

A short demonstration of @gregmac's (excellent and detailed) answer, which essentially recommends $PSCommandPath as the only reliable command to return the currently running script where Powershell 3.0 and above is used.

Here I show returning either the full path or just the file name.

Test.ps1:

'Direct:'
$PSCommandPath  # Full Path 
Split-Path -Path $PSCommandPath -Leaf  # File Name only

function main () {
  ''
  'Within a function:'
  $PSCommandPath
  Split-Path -Path $PSCommandPath -Leaf
}

main

Output:

PS> .\Test.ps1
Direct:
C:\Users\John\Documents\Sda\Code\Windows\PowerShell\Apps\xBankStatementRename\Test.ps1
Test.ps1

Within a function:
C:\Users\John\Documents\Sda\Code\Windows\PowerShell\Apps\xBankStatementRename\Test.ps1
Test.ps1

This can works on most powershell versions:

(& { $MyInvocation.ScriptName; })

This can work for Scheduled Job

Get-ScheduledJob |? Name -Match 'JOBNAMETAG' |% Command