Put a file or directory under version control, so it will be in the current checkout

Put files or directories under Fossil version control.
More information: <https://fossil-scm.org/home/help/add>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

fossil add {{path/to/file_or_directory}}

click the source code to copy install fossil add on any operating system with command-not-found.com