purifyeps: 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/purifyeps - from package: purifyeps

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

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