Is there any manual about C in Linux? If any, what is it?
While I find that we can read some manuals about Library calls (C library functions) & acsii in Linux. But I still do not find any manual about C precedence order so far.
documentation
where does lspci gather its information from?
In kernel.org’s documentation on proc I found “[The latest version of this document is available online“. There I says: “… lspci is a synonym for cat /proc/pci“.
How updated and relevant is “The Linux Documentation Project”?
I have been advised by many senior Unix/Linux Administrators to go through “The Linux Documentation Project” on the site www.tldp.org.