sfc: command not found

Have You tried accessing the binary with the full path?

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/sfc - from package: sfc

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