ncview: 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/ncview - from package: ncview

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

On Debian possible default full paths are:

/usr/bin/ncview - from package: ncview

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

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