epinfo: 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/epinfo - from package: photopc

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

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