ck-history: 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/ck-history - from package: ConsoleKit

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

On Debian possible default full paths are:

/usr/bin/ck-history - from package: ConsoleKit

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

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