pepnet: 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/pepnet - from package: emboss

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

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