euare-userdelcert: 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-userdelcert - from package: euca2ools

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

On Debian possible default full paths are:

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

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

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