Cone4: 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/Cone4 - from package: vtk-examples

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

Error in other languages:
Cone4: bevel nie gevind nie
Cone4: comandă negăsită
Cone4: comando não encontrado
Cone4: commande introuvable
Cone4: command not found
Cone4: käsku ei ole
Cone4: không tìm thấy lệnh
Cone4: komanda nerasta
Cone4: Kommando nicht gefunden.
Cone4: kommandot finns inte
Cone4: komut yok
Cone4: nie znaleziono polecenia
Cone4: níor aimsíodh an t-ordú
Cone4: no se encontró la orden
Cone4: no s'ha trobat l'ordre
Cone4: opdracht niet gevonden
Cone4: parancs nem található
Cone4: perintah tidak ditemukan
Cone4: príkaz nenájdený
Cone4: příkaz nenalezen
Cone4: команда не найдена
Cone4: командата не е открита
Cone4: 命令找不到
Cone4: コマンドが見つかりません