copyfs-daemon: 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/copyfs-daemon - from package: copyfs

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

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