queuegraph-rrd.sh: 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/queuegraph-rrd.sh - from package: queuegraph

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

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