pvs: 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 CentOS possible default full paths are:

/sbin/pvs - from package: lvm2

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

On Debian possible default full paths are:

/sbin/pvs - from package: lvm2

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

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