plrc: 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/plrc - from package: pl

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

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