eql_enslave: 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/sbin/eql_enslave - from package: eql

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

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