imcfw: 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/imcfw - from package: ion

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

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