alarmclock: 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/alarmclock - from package: alarm-clock

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

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