Cone: 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/Cone - from package: vtk-examples

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

On Debian possible default full paths are:

/usr/bin/Cone - from package: cone

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

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