syrthes4med30: 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/syrthes4med30 - from package: syrthes-tools
/usr/lib/syrthes/bin/syrthes4med30 - from package: syrthes-tools

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

Error in other languages:
syrthes4med30: bevel nie gevind nie
syrthes4med30: comandă negăsită
syrthes4med30: comando não encontrado
syrthes4med30: commande introuvable
syrthes4med30: command not found
syrthes4med30: käsku ei ole
syrthes4med30: không tìm thấy lệnh
syrthes4med30: komanda nerasta
syrthes4med30: Kommando nicht gefunden.
syrthes4med30: kommandot finns inte
syrthes4med30: komut yok
syrthes4med30: nie znaleziono polecenia
syrthes4med30: níor aimsíodh an t-ordú
syrthes4med30: no se encontró la orden
syrthes4med30: no s'ha trobat l'ordre
syrthes4med30: opdracht niet gevonden
syrthes4med30: parancs nem található
syrthes4med30: perintah tidak ditemukan
syrthes4med30: príkaz nenájdený
syrthes4med30: příkaz nenalezen
syrthes4med30: команда не найдена
syrthes4med30: командата не е открита
syrthes4med30: 命令找不到
syrthes4med30: コマンドが見つかりません