rhc: 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/rhc - from package: rhc

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

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