prdb_check: 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/prdb_check - from package: openafs-dbserver

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

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