pepinfo: 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/pepinfo - from package: emboss

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

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