ncftpbookmarks: 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/ncftpbookmarks - from package: ncftp

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

On Debian possible default full paths are:

/usr/bin/ncftpbookmarks - from package: ncftp

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

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