shorewall-lite: 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:

/sbin/shorewall-lite - from package: shorewall-lite

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

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