osage: 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/osage - from package: graphviz

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

On Debian possible default full paths are:

/usr/bin/osage - from package: graphviz

You may install the required package with command apt-get install {package}

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