pvremove: 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/pvremove - from package: lvm2

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

On Debian possible default full paths are:

/sbin/pvremove - from package: lvm2

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

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