This is a note from when I installed tmux on a CentOS 6 minimal VM. If you run `yum` without thinking about it, you get Error: Nothing to do because the package is not available. If you just want to install tmux quickly and do not mind that the version is a little old, the following is enough.
Installation
Install it with yum.
$ sudo yum install epel-release ... $ sudo yum install tmux…
Package Arch Version Repository Size
Installing: tmux x86_64 1.6-3.el6 epel 208 k
Transaction Summary
Install 1 Package(s)
Total download size: 208 k Installed size: 494 k Is this ok [y/N]: …
$ tmux -V tmux 1.6
Test Environment
$ cat /etc/centos-release CentOS release 6.10 (Final)
Bonus
.tmux.conf
Automatically Start tmux When Added to bashrc

Me
Since this is a VM test environment I use often, it may be worth putting this in the Vagrant file.