science-economics: 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-economics - from package: science-economics

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

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