read-front: 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/lib64/piglit/bin/read-front - from package: piglit

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

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