rdmpro_sniffer: 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/rdmpro_sniffer - from package: ola

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

On Debian possible default full paths are:

/usr/bin/rdmpro_sniffer - from package: ola

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

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