tetradraw: 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/tetradraw - from package: tetradraw

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

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