science-geometry: 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/science-geometry - from package: science-geometry

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

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