sfv-hash: 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/sfv-hash - from package: rhash

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

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