ftpsend: 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/ftpsend - from package: qftp

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

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