cyrdump: 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/lib/cyrus/bin/cyrdump - from package: cyrus-common

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

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