config11: 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/config11 - from package: simh

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

Error in other languages:
config11: bevel nie gevind nie
config11: comandă negăsită
config11: comando não encontrado
config11: commande introuvable
config11: command not found
config11: käsku ei ole
config11: không tìm thấy lệnh
config11: komanda nerasta
config11: Kommando nicht gefunden.
config11: kommandot finns inte
config11: komut yok
config11: nie znaleziono polecenia
config11: níor aimsíodh an t-ordú
config11: no se encontró la orden
config11: no s'ha trobat l'ordre
config11: opdracht niet gevonden
config11: parancs nem található
config11: perintah tidak ditemukan
config11: príkaz nenájdený
config11: příkaz nenalezen
config11: команда не найдена
config11: командата не е открита
config11: 命令找不到
config11: コマンドが見つかりません