aideinit: 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/sbin/aideinit - from package: aide-common

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