Puppet agent on Windows unless doesn't work how I think?
Solution 1:
To use commands with pipe |, you must use the shell builtins work around with cmd.exe /C:
See the example below:
exec { 'configure_timezone':
command => "tzutil.exe /s \"${timezone}\"",
unless => "cmd.exe /C tzutil.exe /g | findstr /C:\"${timezone}\"",
}