rizin -H to list all the environment variables that matter to know where it will
be looking for files. Those paths depend on the way (and operating system) you have
built rizin for.
RZ_PREFIX=/usr MAGICPATH=/usr/share/rizin/2.8.0-git/magic PREFIX=/usr INCDIR=/usr/include/libr LIBDIR=/usr/lib64 LIBEXT=so RCONFIGHOME=/home/user/.config/rizin RDATAHOME=/home/user/.local/share/rizin RCACHEHOME=/home/user/.cache/rizin LIBR_PLUGINS=/usr/lib/rizin/2.8.0-git USER_PLUGINS=/home/user/.local/share/rizin/plugins USER_ZIGNS=/home/user/.local/share/rizin/zigns
RC files are rizin scripts that are loaded at startup time. Those files must be in 3 different places:
rizin will first try to load /usr/share/rizin/rizinrc
Each user in the system can have its own rizin scripts to run on startup to select the color scheme, and other custom options by having rizin commands in there.
If you want to run a script every time you open a file, just create a file with the same name of the file
.rz to it.