mongoose: 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/mongoose - from package: mongoose

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

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