pmstore: 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/pmstore - from package: pcp

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

On Debian possible default full paths are:

/usr/bin/pmstore - from package: pcp

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

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