plutil: command not found

Have You tried accessing the binary with the full path?

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/plutil - from package: libplist

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