Basic Usage
The Jekyll gem makes a jekyll executable available to you in your Terminal
window. You can use this command in a number of ways:
$ jekyll build
# => The current folder will be generated into ./_site
$ jekyll build --destination <destination>
# => The current folder will be generated into <destination>
$ jekyll build --source <source> --destination <destination>
# => The <source> folder will be generated into <destination>
$ jekyll build --watch
# => The current folder will be generated into ./_site,
#    watched for changes, and regenerated automatically.Destination folders are cleaned on site builds
    The contents of <destination> are automatically
    cleaned when the site is built.  Files or folders that are not
    created by your site will be removed.  Do not use an important
    location for <destination>; instead, use it as
    a staging area and copy files from there to your web server.
  
Jekyll also comes with a built-in development server that will allow you to preview what the generated site will look like in your browser locally.
$ jekyll serve
# => A development server will run at http://localhost:4000/
$ jekyll serve --detach
# => Same as `jekyll serve` but will detach from the current terminal.
#    If you need to kill the server, you can `kill -9 1234` where "1234" is the PID.
#    If you cannot find the PID, then do, `ps aux | grep jekyll` and kill the instance. [Read more](http://unixhelp.ed.ac.uk/shell/jobz5.html).
$ jekyll serve --watch
# => Same as `jekyll serve`, but watch for changes and regenerate automatically.These are just a few of the available configuration options.
Many configuration options can either be specified as flags on the command line,
or alternatively (and more commonly) they can be specified in a _config.yml
file at the root of the source directory. Jekyll will automatically use the
options from this file when run. For example, if you place the following lines
in your _config.yml file:
source:      _source
destination: _deployThen the following two commands will be equivalent:
$ jekyll build
$ jekyll build --source _source --destination _deployFor more about the possible configuration options, see the configuration page.