qpid-queue-stats: command not found

Have You tried accessing the binary with the full path?

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/qpid-queue-stats - from package: qpid-tools

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