ecppl: 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/ecppl - from package: libtntnet-dev

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