euare-userdelkey: 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/euare-userdelkey - from package: euca2ools

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

On Debian possible default full paths are:

/usr/bin/euare-userdelkey - from package: euca2ools

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

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