scilab-bin: command not found

Have You tried accessing the binary with the full path?

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/lib/debug/usr/bin/scilab-bin - from package: scilab-full-bin-dbg
/usr/bin/scilab-bin - from package: scilab-full-bin

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