Cannot run Jekyll build as non-root user

If you accidently run Jekyll build or serve as root user and now want to run it as any other user and get an error message like:

[kausar@centos ~]$ jekyll build
Configuration file: _config.yml
            Source: <omitted>
       Destination: <omitted>
 Incremental build: disabled. Enable with --incremental
      Generating...
jekyll 3.1.6 | Error:  Permission denied - _site

This is because it generated the destination directory (_site in my case) when it was running as root user. Hence root now owns that directory and cannot be changed by other users. Changing the owner using the following command should resolve the issue.

# assuming destination directory is called _site
sudo chown -R $(whoami):$(whoami) _site

Bash will run $(whoami) first replacing it with your username. Then the sudo chown will run and change the owner of the directory.

Now just clean Jekyll and try again:

# Remove jekyll metadata file.
jekyll clean