emem: 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/lib64/erlang/lib/tools-2.6.6.5/bin/emem - from package: erlang-tools

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

On Debian possible default full paths are:

/usr/lib/debug/usr/lib/erlang/lib/tools-2.7/bin/emem - from package: erlang-dbg
/usr/lib/erlang/lib/tools-2.7/bin/emem - from package: erlang-tools

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

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