snake-install: 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-install - from package: snake

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

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