alsa-info: 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/alsa-info - from package: alsa-utils

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

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