projectM-pulseaudio: 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/projectM-pulseaudio - from package: projectM-pulseaudio

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

On Debian possible default full paths are:

/usr/bin/projectM-pulseaudio - from package: projectM-pulseaudio

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

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