askbot-setup: 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/askbot-setup - from package: askbot

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

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