supernode: 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/supernode - from package: n2n

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

On Debian possible default full paths are:

/usr/bin/supernode - from package: n2n

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

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