runsnakemem: 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/runsnakemem - from package: runsnakerun

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

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