wmifs: 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/wmifs - from package: wmifs

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

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