kftpgrabber: 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 Debian possible default full paths are:

/usr/bin/kftpgrabber - from package: kftpgrabber

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

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