ncargworld: 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/ncargworld - from package: ncl

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

On Debian possible default full paths are:

/usr/bin/ncargworld - from package: ncl-ncarg

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

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