9bind: 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/9bind - from package: 9mount

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

Error in other languages:
9bind: bevel nie gevind nie
9bind: comandă negăsită
9bind: comando não encontrado
9bind: commande introuvable
9bind: command not found
9bind: käsku ei ole
9bind: không tìm thấy lệnh
9bind: komanda nerasta
9bind: Kommando nicht gefunden.
9bind: kommandot finns inte
9bind: komut yok
9bind: nie znaleziono polecenia
9bind: níor aimsíodh an t-ordú
9bind: no se encontró la orden
9bind: no s'ha trobat l'ordre
9bind: opdracht niet gevonden
9bind: parancs nem található
9bind: perintah tidak ditemukan
9bind: príkaz nenájdený
9bind: příkaz nenalezen
9bind: команда не найдена
9bind: командата не е открита
9bind: 命令找不到
9bind: コマンドが見つかりません