pmk: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/pmk - from package: pmk

You may install the required package with command apt-get install {package}

Error in other languages:
pmk: bevel nie gevind nie
pmk: comandă negăsită
pmk: comando não encontrado
pmk: commande introuvable
pmk: command not found
pmk: käsku ei ole
pmk: không tìm thấy lệnh
pmk: komanda nerasta
pmk: Kommando nicht gefunden.
pmk: kommandot finns inte
pmk: komut yok
pmk: nie znaleziono polecenia
pmk: níor aimsíodh an t-ordú
pmk: no se encontró la orden
pmk: no s'ha trobat l'ordre
pmk: opdracht niet gevonden
pmk: parancs nem található
pmk: perintah tidak ditemukan
pmk: príkaz nenájdený
pmk: příkaz nenalezen
pmk: команда не найдена
pmk: командата не е открита
pmk: 命令找不到
pmk: コマンドが見つかりません