aggregate-ios: 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 CentOS possible default full paths are:

/usr/bin/aggregate-ios - from package: aggregate-ios

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/aggregate-ios - from package: aggregate

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

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