pmw: 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/pmw - from package: pmw

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

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