echo-client-2: 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 Debian possible default full paths are:

/usr/bin/echo-client-2 - from package: libbonobo2-bin

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

Error in other languages:
echo-client-2: bevel nie gevind nie
echo-client-2: comandă negăsită
echo-client-2: comando não encontrado
echo-client-2: commande introuvable
echo-client-2: command not found
echo-client-2: käsku ei ole
echo-client-2: không tìm thấy lệnh
echo-client-2: komanda nerasta
echo-client-2: Kommando nicht gefunden.
echo-client-2: kommandot finns inte
echo-client-2: komut yok
echo-client-2: nie znaleziono polecenia
echo-client-2: níor aimsíodh an t-ordú
echo-client-2: no se encontró la orden
echo-client-2: no s'ha trobat l'ordre
echo-client-2: opdracht niet gevonden
echo-client-2: parancs nem található
echo-client-2: perintah tidak ditemukan
echo-client-2: príkaz nenájdený
echo-client-2: příkaz nenalezen
echo-client-2: команда не найдена
echo-client-2: командата не е открита
echo-client-2: 命令找不到
echo-client-2: コマンドが見つかりません