tilp: 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/tilp - from package: tilp2

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