syrthes4ensight: 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/syrthes4ensight - from package: syrthes-tools
/usr/lib/syrthes/bin/syrthes4ensight - from package: syrthes-tools

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

Error in other languages:
syrthes4ensight: bevel nie gevind nie
syrthes4ensight: comandă negăsită
syrthes4ensight: comando não encontrado
syrthes4ensight: commande introuvable
syrthes4ensight: command not found
syrthes4ensight: käsku ei ole
syrthes4ensight: không tìm thấy lệnh
syrthes4ensight: komanda nerasta
syrthes4ensight: Kommando nicht gefunden.
syrthes4ensight: kommandot finns inte
syrthes4ensight: komut yok
syrthes4ensight: nie znaleziono polecenia
syrthes4ensight: níor aimsíodh an t-ordú
syrthes4ensight: no se encontró la orden
syrthes4ensight: no s'ha trobat l'ordre
syrthes4ensight: opdracht niet gevonden
syrthes4ensight: parancs nem található
syrthes4ensight: perintah tidak ditemukan
syrthes4ensight: príkaz nenájdený
syrthes4ensight: příkaz nenalezen
syrthes4ensight: команда не найдена
syrthes4ensight: командата не е открита
syrthes4ensight: 命令找不到
syrthes4ensight: コマンドが見つかりません