gnunet-auto-share: 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/gnunet-auto-share - from package: gnunet

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

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