euare-usercreate: 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-usercreate - from package: euca2ools

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

On Debian possible default full paths are:

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

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

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