qftp: 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/qftp - from package: qftp

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

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