pepwindow: 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/pepwindow - from package: emboss

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

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