cmscan: 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/cmscan - from package: infernal

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

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