cwhois: 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/cwhois - from package: asused

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

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