log2tsung: 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/log2tsung - from package: tsung

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

Error in other languages:
log2tsung: bevel nie gevind nie
log2tsung: comandă negăsită
log2tsung: comando não encontrado
log2tsung: commande introuvable
log2tsung: command not found
log2tsung: käsku ei ole
log2tsung: không tìm thấy lệnh
log2tsung: komanda nerasta
log2tsung: Kommando nicht gefunden.
log2tsung: kommandot finns inte
log2tsung: komut yok
log2tsung: nie znaleziono polecenia
log2tsung: níor aimsíodh an t-ordú
log2tsung: no se encontró la orden
log2tsung: no s'ha trobat l'ordre
log2tsung: opdracht niet gevonden
log2tsung: parancs nem található
log2tsung: perintah tidak ditemukan
log2tsung: príkaz nenájdený
log2tsung: příkaz nenalezen
log2tsung: команда не найдена
log2tsung: командата не е открита
log2tsung: 命令找不到
log2tsung: コマンドが見つかりません