scilab-cli-bin: 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-cli-bin - from package: scilab-minimal-bin

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

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