euare-userlistgroups: 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-userlistgroups - from package: euca2ools

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

On Debian possible default full paths are:

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

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

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