amcrypt: 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/amcrypt - from package: amanda-server

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

On Debian possible default full paths are:

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

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

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