wifi-radar: 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/sbin/wifi-radar - from package: wifi-radar

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

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