plpa-info: 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/plpa-info - from package: plpa

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

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