reply: 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/reply - from package: libreply-perl

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

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