cckdcdsk: 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/cckdcdsk - from package: hercules

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

On Debian possible default full paths are:

/usr/bin/cckdcdsk - from package: hercules

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

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