$ info libc "Library Summary"
File: libc.info, Node: Top, Next: Introduction, Prev: (dir), Up:
(dir)
...
--zz-Info: (libc.info.gz)Top, 1226 lines --Top-- Subfile:
libc.info-1.gz--------
Unable to find the node referenced by "Library Summary".
The same happens with nodes File System Interface, Pipes and FIFOs,
Sockets, Low-Level terminal Interface, Mathematics, Arithmetics, ...
Only nodes Introduction, Error Reporting, ..., Low-Level I/O, can be
accessed from main menu, and command "n" from node Low-Level I/O also
fails to go to node File System Interface:
--zz-Info: (libc.info.gz)Low-Level I/O, 61 lines --Top-- Subfile:
libc.info-17.g
Cannot find the node "(/usr/share/info/libc.info.gz)File System
Interface".