amcheckdump: 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/sbin/amcheckdump - from package: amanda-server

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

On Debian possible default full paths are:

/usr/sbin/amcheckdump - from package: amanda-server

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

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