rhash: 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/rhash - from package: rhash

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

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