eyaml: 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/eyaml - from package: hiera-eyaml

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

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