Find and Replace value using SED

Question

I have one file which contains key value pair

properties.env

development_port=8080
development_type=tcp
staging_port=8081
development_type=http

I need to read value from properties.env and replace it in another file based on some environment variable value lets say ENVIRONMENT=staging/development

config.yml

server:
  adminConnectors:
    -
      port: 18001
      type: http

The final output of config.yml should be if ENVIRONMENT=staging

server:
      adminConnectors:
        -
          port: 8081
          type: http

How can i achieve this using sed command?

Answer 1

Since the properties file looks like it has the right syntax you could just source it, and then replace the entire port line:

source properties.env
sed --in-place "s/port.*/port: $staging_port/" config.yml

This, of course, assumes the "port" line appears only once in your config.