Logg off all Citrix user session in PowerShell

logoff_sessions.ps1

$timeout = 300
$message = "Please save your work. You will be logged off in "+ $timeout/60 +" minutes"
$sessions = @()

# Collect session IDs and warn users
query session | select-string "wdica" | 
%{$_ -replace " {2,27}"," "} | 
foreach {$_.ToString().split(" ")[3]} | 
foreach {
$sessions += $_
msg $_ /TIME:$timeout $message
}

# Wait for timeout
sleep $timeout

# Log off sessions
$sessions | foreach { logoff $_ }