---
title: C3 — Key and Environment Overrides
---

These change fundamental shell behavior: how keys work, which pager opens,
and what the prompt looks like. Disabling `__fish_config_op_overrides` removes
all of them.

    Override                  What it replaces or sets
    ───────────────────────────────────────────────────────────────────────────
    Vi mode                   fish_vi_key_bindings replaces default Emacs mode
    PATH setup                Prepends custom bin directories to the PATH
    exit → smart_exit         exit wrapper that captures scrollback before closing
    PAGER=ov                  ov used by git, man, and all $PAGER-aware tools
    EDITOR=nvim               nvim fallback to vi for git commit, etc.
    GPG_TTY                   Sets GPG_TTY to current terminal tty
    MANPAGER=bat pipeline     man pages rendered with syntax highlighting
    CDPATH=. ~/projects ~     bare dir names resolve against ~/projects and ~
    Bang-bang system          ! and $ keys expand history; !^, !*, !-N, !?str?,
                              ^old^new abbreviations; six expand_bang_* helpers
    Autopair                  ( [ { " ' auto-close to (), [], {}, "", ''
    Puffer key intercepts     . ! $ * keys intercepted for smart expansion
    Starship prompt           fish_prompt replaced by Starship + OSC 133 markers
    Catppuccin colors         30+ fish_color_* variables set to Mocha palette
    FZF_DEFAULT_OPTS          FZF themed to Catppuccin Mocha colors
    Right prompt              fish_right_prompt: exit code (on failure) + dim timestamp; always rendered; Docker context added when starship+C3 active
    DO_NOT_TRACK=1            Universal telemetry opt-out for tools and AI agents
    DISABLE_TELEMETRY=1       Telemetry opt-out for telemetry-aware CLIs

The bang-bang system spans `key_bindings.fish`, `abbr.fish`, `puffer.fish`, and
six `expand_bang_*.fish` functions. All are gated together — disabling C3
removes the entire bang-expansion system at once.

When C3 is disabled, `exit` falls back to `builtin exit` with no scrollback
capture, no Kitty IPC, and no file I/O on exit. The scrollback capture block
is independently controlled by C5 (see below).

## Sub-categories

`__fish_config_op_overrides` sub-divides into four sub-categories, each
with its own `__fish_config_op_overrides_<slug>` toggle:

## key-bindings

Vi mode, autopair, puffer key intercepts, bang-bang history expansion,
and `smart_exit`'s plain-exit path.

## environment

`$PATH`, `$PAGER`/`$EDITOR`/`$GPG_TTY`, and `$CDPATH`.

## prompt

Starship, the right prompt, Catppuccin syntax/prompt colors, and FZF
theming (`$FZF_DEFAULT_OPTS`) -- all driven by the same guard as a single
unit, not independently toggleable from each other.

## privacy

`$DO_NOT_TRACK` and `$DISABLE_TELEMETRY` environment variables for
telemetry opt-out across CLI tools, runtimes, and AI agents.