There are linux config files, usually starting with .

• .profile: set environment variabiles and so on when you log in. Doesn't appear to be loaded by default, so I deliberately source it
• .xprofile: equivalent of .profile for X
• .XSessionrc: loaded when you log in to X
• .XResources: also loaded when you log in to X
  • Use xrdb to force load changes
  • Sets a resources string on the main X window
  • Works with X forwarding
• .XDefaults: obsolete version of .XResources which programs can query every time they are launched.
• .XModmap: keys
• .xshrc: loaded when you launch zsh