netscript: 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/netscript - from package: netscript-2.4
/sbin/netscript - from package: netscript-ipfilter

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

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