scissor-offscreen: 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/scissor-offscreen - from package: piglit

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

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