triplea.jar: command not found

Have You tried accessing the binary with the full path?

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/share/triplea/bin/triplea.jar - from package: triplea

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