ktimetracker: 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/ktimetracker - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/ktimetracker - from package: ktimetracker

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

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