wmclockmon: 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/wmclockmon - from package: wmclockmon

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

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