pftp: 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/pftp - from package: ftp

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

On Debian possible default full paths are:

/usr/bin/pftp - from package: ftp-ssl
/usr/bin/pftp - from package: ftp

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

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