sbnc: 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/sbin/sbnc - from package: sbnc

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

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