pv: 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:

/usr/bin/pv - from package: pv

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

On Debian possible default full paths are:

/usr/bin/pv - from package: pv

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

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