pmpause: 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/pmpause - from package: pcp

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

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