oauth: 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/oauth - from package: ruby-oauth

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

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