tsung-rrd: 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/tsung-rrd - from package: tsung

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

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