--- title: Components Reference manTitle: 8. COMPONENTS REFERENCE sidebar: order: 12 helpKeywords: - componentsreference --- The following tables detail every component in each category. Use this reference to understand exactly which behaviors change when you toggle a category variable. Category Description ────────────────────────────────────────────────────────────────────────── C1 [Command Shadows](/08-components-reference/01-c1-command-shadows/) — Wraps destructive commands (`rm`, `cp`) to be safe by default C2 [Startup Side-Effects](/08-components-reference/02-c2-startup-side-effects/) — Bootstraps Fisher, generates wrappers, auto-activates venvs C3 [Overrides](/08-components-reference/03-c3-key-and-environment-overrides/) — Overrides `cd`, sets Vi mode, binds `` to `smart_enter` C4 [Integrations](/08-components-reference/04-c4-terminal-and-tool-integration/) — Kitty/Wezterm integrations, starship hooks, fzf theme C5 [Logging and Capture](/08-components-reference/05-c5-logging-and-capture/) — Session logs, command duration C6 [Greeting & First-Run UI](/08-components-reference/06-c6-greeting-and-first-run-ui/) — Custom startup banner Each category further sub-divides into two to six sub-categories (24 in total) with their own `__fish_config_op__` toggles -- see that category's page for its sub-category list. ## Per-function overrides: `C0`/`always` Every guarded function or file can also carry a reserved `always/on` or `always/off` tag in its `# COMPONENT` header, independent of every C1-C6 category and sub-category toggle and invisible to `config-settings`. An `always/off` tag disables that function unconditionally; an `always/on` tag enables it unconditionally, ignoring the state of every other tagged sub-category. This is a per-function escape hatch for cases too granular or too idiosyncratic to justify a taxonomy entry -- edit the header directly and run `__fish_config_op_registry_rebuild` to apply the change.