gmetad: 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/gmetad - from package: ganglia-gmetad

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

On Debian possible default full paths are:

/usr/sbin/gmetad - from package: gmetad

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

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