chicken: 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/chicken - from package: chicken

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

On Debian possible default full paths are:

/usr/bin/chicken - from package: chicken-bin

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

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