ept-cache: command not found

Have You tried accessing the binary with the full path?

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/ept-cache - from package: ept-cache

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