scbayes: 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/scbayes - from package: scmail

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

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