runsnake: 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 Debian possible default full paths are:

/usr/bin/runsnake - from package: runsnakerun

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

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