cacaclock: 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/cacaclock - from package: caca-utils

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

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