edfhed-gtk: 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/edfhed-gtk - from package: aghermann

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

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