arecord: 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/arecord - from package: alsa-utils

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

On Debian possible default full paths are:

/usr/bin/arecord - from package: alsa-utils

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

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