cs: 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/cs - from package: clearsilver

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

On Debian possible default full paths are:

/usr/bin/cs - from package: csound

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

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