amflush: 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/amflush - from package: amanda-server

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

On Debian possible default full paths are:

/usr/sbin/amflush - from package: amanda-server

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

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