plee-the-bear: 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/plee-the-bear - from package: plee-the-bear

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

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