sgf2dg: 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/sgf2dg - from package: sgf2dg

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

Error in other languages:
sgf2dg: bevel nie gevind nie
sgf2dg: comandă negăsită
sgf2dg: comando não encontrado
sgf2dg: commande introuvable
sgf2dg: command not found
sgf2dg: käsku ei ole
sgf2dg: không tìm thấy lệnh
sgf2dg: komanda nerasta
sgf2dg: Kommando nicht gefunden.
sgf2dg: kommandot finns inte
sgf2dg: komut yok
sgf2dg: nie znaleziono polecenia
sgf2dg: níor aimsíodh an t-ordú
sgf2dg: no se encontró la orden
sgf2dg: no s'ha trobat l'ordre
sgf2dg: opdracht niet gevonden
sgf2dg: parancs nem található
sgf2dg: perintah tidak ditemukan
sgf2dg: príkaz nenájdený
sgf2dg: příkaz nenalezen
sgf2dg: команда не найдена
sgf2dg: командата не е открита
sgf2dg: 命令找不到
sgf2dg: コマンドが見つかりません