shinken: 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 - from package: shinken

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

On Debian possible default full paths are:

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

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

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