a56-tobin: 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 Debian possible default full paths are:

/usr/bin/a56-tobin - from package: a56

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

Error in other languages:
a56-tobin: bevel nie gevind nie
a56-tobin: comandă negăsită
a56-tobin: comando não encontrado
a56-tobin: commande introuvable
a56-tobin: command not found
a56-tobin: käsku ei ole
a56-tobin: không tìm thấy lệnh
a56-tobin: komanda nerasta
a56-tobin: Kommando nicht gefunden.
a56-tobin: kommandot finns inte
a56-tobin: komut yok
a56-tobin: nie znaleziono polecenia
a56-tobin: níor aimsíodh an t-ordú
a56-tobin: no se encontró la orden
a56-tobin: no s'ha trobat l'ordre
a56-tobin: opdracht niet gevonden
a56-tobin: parancs nem található
a56-tobin: perintah tidak ditemukan
a56-tobin: príkaz nenájdený
a56-tobin: příkaz nenalezen
a56-tobin: команда не найдена
a56-tobin: командата не е открита
a56-tobin: 命令找不到
a56-tobin: コマンドが見つかりません