br_biofetch: 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/br_biofetch - from package: ruby-bio

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

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