avahi-browse: 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/avahi-browse - from package: avahi-tools

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

On Debian possible default full paths are:

/usr/bin/avahi-browse - from package: avahi-utils

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

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