cckd2ckd: 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/cckd2ckd - from package: hercules

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

On Debian possible default full paths are:

/usr/bin/cckd2ckd - from package: hercules

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

Error in other languages:
cckd2ckd: bevel nie gevind nie
cckd2ckd: comandă negăsită
cckd2ckd: comando não encontrado
cckd2ckd: commande introuvable
cckd2ckd: command not found
cckd2ckd: käsku ei ole
cckd2ckd: không tìm thấy lệnh
cckd2ckd: komanda nerasta
cckd2ckd: Kommando nicht gefunden.
cckd2ckd: kommandot finns inte
cckd2ckd: komut yok
cckd2ckd: nie znaleziono polecenia
cckd2ckd: níor aimsíodh an t-ordú
cckd2ckd: no se encontró la orden
cckd2ckd: no s'ha trobat l'ordre
cckd2ckd: opdracht niet gevonden
cckd2ckd: parancs nem található
cckd2ckd: perintah tidak ditemukan
cckd2ckd: príkaz nenájdený
cckd2ckd: příkaz nenalezen
cckd2ckd: команда не найдена
cckd2ckd: командата не е открита
cckd2ckd: 命令找不到
cckd2ckd: コマンドが見つかりません