pacmd: 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/pacmd - from package: pulseaudio-utils

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

On Debian possible default full paths are:

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

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

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