ncdump: 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/ncdump - from package: netcdf

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

On Debian possible default full paths are:

/usr/bin/ncdump - from package: netcdf-bin

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

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