ktrash: 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/ktrash - from package: kdebase-runtime

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

On Debian possible default full paths are:

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

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

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