pvmgs: 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/pvmgs - from package: pvm

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

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