oarnodes: 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/oarnodes - from package: oar-user

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

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