Package info

A stand-alone TTY-based reader for GNU texinfo documentation

http://www.gnu.org/software/texinfo/

The GNU project uses the texinfo file format for much of its
documentation. The info package provides a standalone TTY-based
browser program for viewing texinfo files.

General Commands (Section 1)
info
Read documentation in Info format.
install-info
Add or remove entries in INFO-FILE from the Info directory DIR-FILE. INFO-FILE and DIR-FILE are required unless the --info-file or --dir-file (or --info-dir)...
File Formats (Section 5)
info
The Info file format is an easily-parsable representation for online documents. It can be read by emacs(1) and info(1) among other programs. Info files are...