serverspec-init: 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/serverspec-init - from package: ruby-serverspec

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

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