percolator: 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/percolator - from package: percolator

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

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