scilab-adv-cli: 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/scilab-adv-cli - from package: scilab

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

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