It's generally not used or whatever the user defines it as.
Files in unix operating systems with a '.' character as the first character in the filename are hidden.
NIS package
they're probably somewhere in /var/log
Unix / Linux are both file based operating systems. The majority of configuration can be amended by system configuration files, although as the systems have developed more and more of this is automated and hidden from the user. User configuration files will normally reside under the /etc directory.
NIS (Network Information Service).
A system determines its default runlevel through the configuration files typically located in /etc/inittab or, in newer systems using systemd, through the default target specified in the /etc/systemd/system/default.target file. The default runlevel or target indicates the state in which the system will start, such as multi-user mode or graphical mode. During the boot process, the init system reads this configuration to establish the appropriate environment and services to launch. If not explicitly set, the system may fall back to a predefined runlevel or target.
The C header files are in the same place as other Unix and Unix-like systems: /usr/include if you installed the compiler.
On some Linux systems there is an application called "GNOME Do" which does that.
For the purpose of this question, I'll stick to file systems that Linux natively supports and can boot off of.FAT12FAT16FAT32X-FAT (used on the Xbox)Minixextext2ext3ReiserFSReiser4JFSXFS
For Linux and some Unix systems, the /proc system is not on the hard drive.
RPM packages are installation packages designed for Red Hat based system. They are similar to .exe files for Windows, and .deb files for debian systems.
do your own research