gpvo: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/gpvo - from package: gputils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gpvo - from package: gputils

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