ktraderclient: 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/ktraderclient - from package: kdebase-runtime

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

On Debian possible default full paths are:

/usr/bin/ktraderclient - from package: kde-runtime

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

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