fdtget: 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/bin/fdtget - from package: dtc

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

On Debian possible default full paths are:

/usr/bin/fdtget - from package: device-tree-compiler

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

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