exrstdattr: 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/exrstdattr - from package: OpenEXR

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

On Debian possible default full paths are:

/usr/bin/exrstdattr - from package: OpenEXR

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

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