How to Install a Text editor on Docker Container
Almost all docker containers do not have a text editor by default. But most of the time you will need a command line text editor for edit files inside a docker container.
Install Vim on Docker Container
Most docker containers are based on Debian and Ubuntu Linux. So you should able install vim on docker with apt-get command.
apt-get update apt-get install vim
If the docker container is a redhat based distribution, use the yum install command.
yum install vim
Install nano Text Editor on Docker
On debian based containers, install nano editor with apt-get command.
apt-get update apt-get install nano
On a Redhat/CentOS based container, Type:
yum install nano
To use the nano text editor you will also need to set 'TERM' environment variable.