oathtool: 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/bin/oathtool - from package: oathtool

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

On Debian possible default full paths are:

/usr/bin/oathtool - from package: oathtool

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

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