opimport: 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/opimport - from package: oprofile

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