amserverconfig: command not found

Have You tried accessing the binary with the full path?

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/amserverconfig - from package: amanda-server

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

On Debian possible default full paths are:

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

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