cckddiag: 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/cckddiag - from package: hercules

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

On Debian possible default full paths are:

/usr/bin/cckddiag - from package: hercules

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

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