Info is a software utility
which forms a hypertextual, multipage documentation
and help viewer working on a command-line interface.
Info reads info files generated by the texinfo program
and presents the documentation as a tree with simple commands to traverse the tree and to follow cross references.
The C implementation of info was designed as
the main documentation system of GNU based operating systems
and was then ported to other Unix-like operating systems.
note:
press 'h' to see basic info command keys
press 'info info' to advance info command