aesvt: 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/aesvt - from package: aegis

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