csi: 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/csi - from package: chicken

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

On Debian possible default full paths are:

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

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

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