shinken-poller: 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/sbin/shinken-poller - from package: shinken-poller

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

On Debian possible default full paths are:

/usr/bin/shinken-poller - from package: shinken-common

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

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