tkaegis: 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/tkaegis - from package: aegis-tk

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

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