btrecord: 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/btrecord - from package: blktrace

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

On Debian possible default full paths are:

/usr/sbin/btrecord - from package: blktrace

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

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