jython: 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/jython - from package: jython

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

On Debian possible default full paths are:

/usr/bin/jython - from package: jython

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

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