clamfs: 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/clamfs - from package: clamfs

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

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