snake-server: 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/sbin/snake-server - from package: snake-server

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

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