elfedit: command not found

Have You tried accessing the binary with the full path?

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/elfedit - from package: binutils

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