ezmapdemo: 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/ezmapdemo - from package: ncl

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

On Debian possible default full paths are:

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

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

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