aepatch: 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/aepatch - from package: aegis

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

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