tetraview: 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/tetraview - from package: tetradraw

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

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