drawgraph: 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/drawgraph - from package: cjdns-graph

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

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