pmquery: 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/pmquery - from package: pcp-gui

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

On Debian possible default full paths are:

/usr/bin/pmquery - from package: pcp-gui

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

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