pmprobe: 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/pmprobe - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmprobe - from package: pcp

You may install the required package with command apt-get install {package}

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