ncftpget: 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/ncftpget - from package: ncftp

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

On Debian possible default full paths are:

/usr/bin/ncftpget - from package: ncftp

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

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