bbtime: 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/bbtime - from package: bbtime

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

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