aegis: 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/aegis - from package: aegis

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

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