fwlogwatch: 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/fwlogwatch - from package: fwlogwatch

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

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