fs-uae-netplay-server: 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/fs-uae-netplay-server - from package: fs-uae-netplay-server

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

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