parec: 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/parec - from package: pulseaudio-utils

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

On Debian possible default full paths are:

/usr/bin/parec - from package: pulseaudio-utils

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

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