blkrawverify: 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/blkrawverify - from package: blktrace

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

On Debian possible default full paths are:

/usr/bin/blkrawverify - from package: blktrace

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

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