boris: 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/boris - from package: php-d11wtq-boris

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

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