$user = "user"
$password = "password"
$hostname = "host"
$plinkPath = gci -Recurse | Where-Object {$_.Name -eq "plink.exe"} | select -First 1 | foreach{$_.FullName}
& $plinkPath "$User@$hostname" -pw $password "echo" "hello ab`"cdef world"

$user = "user"
$password = "password"
$hostname = "host"
$plinkPath = gci -Recurse | Where-Object {$_.Name -eq "plink.exe"} | select -First 1 | foreach{$_.FullName}
$command = "hello ab``"cdef world"
& $plinkPath "$User@$hostname" -pw $password "echo" ($command -replace '(\*)"','$1$1"')