wmclock: 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/wmclock - from package: wmclock

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

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