cckdswap: 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/cckdswap - from package: hercules

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

On Debian possible default full paths are:

/usr/bin/cckdswap - from package: hercules

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

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