science-electronics: 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-electronics - from package: science-electronics

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

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