ktradertest: 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/ktradertest - from package: kdelibs3

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

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