brltty-config: 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:

/bin/brltty-config - from package: brltty

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

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