citydecoder: 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/bin/citydecoder - from package: splat

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