fbgs: 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/fbgs - from package: fbida-fbgs

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

On Debian possible default full paths are:

/usr/bin/fbgs - from package: fbi

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

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