ksc: 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/ksc - from package: ksc

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

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