pmiostat: command not found

Have You tried accessing the binary with the full path?

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/pmiostat - from package: pcp-system-tools

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

On Debian possible default full paths are:

/usr/bin/pmiostat - from package: pcp

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