supybot-test: 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/supybot-test - from package: supybot-gribble
/usr/bin/supybot-test - from package: supybot

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

On Debian possible default full paths are:

/usr/bin/supybot-test - from package: supybot

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

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