showpep: 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/showpep - from package: emboss

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

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