pmconfig: 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/libexec/pcp/bin/pmconfig - from package: pcp

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

On Debian possible default full paths are:

/usr/lib/pcp/bin/pmconfig - from package: pcp

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

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