uc-echo: 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/uc-echo - from package: uc-echo

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

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