sheepfs: 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/sbin/sheepfs - from package: sheepdog

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

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