amrestore: 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/amrestore - from package: amanda

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

On Debian possible default full paths are:

/usr/sbin/amrestore - from package: amanda-client

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

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