vzcfgvalidate: 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/sbin/vzcfgvalidate - from package: vzctl

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

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