filelight: 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/filelight - from package: filelight

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

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