gmond: 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/sbin/gmond - from package: ganglia-gmond

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

On Debian possible default full paths are:

/usr/sbin/gmond - from package: ganglia-monitor

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

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