ktimer: 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/ktimer - from package: kdeutils

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

On Debian possible default full paths are:

/usr/bin/ktimer - from package: ktimer

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

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