PatchPcdValue: 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/PatchPcdValue - from package: edk2-tools-python

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

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