amdevcheck: 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/amdevcheck - from package: amanda-server

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

On Debian possible default full paths are:

/usr/sbin/amdevcheck - from package: amanda-common

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

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