cacademo: 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 CentOS possible default full paths are:

/usr/bin/cacademo - from package: caca-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/cacademo - from package: caca-utils

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

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