ccs: 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/ccs - from package: ccs

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

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