activate-devpay: 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/activate-devpay - from package: amanda-server

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

On Debian possible default full paths are:

/usr/sbin/activate-devpay - from package: amanda-server

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

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