nasd: 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 CentOS possible default full paths are:

/usr/bin/nasd - from package: nas

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/nasd - from package: nas

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

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