Significant changes

• The clipboard integration has been revamped with explicit bindings. The killring commands no longer copy from, or paste to, the X11 clipboard - use the new copy (C-x) and paste (C-v) bindings instead. The clipboard is now available on OS X as well as systems using X11 (e.g. Linux). (#3061)
• history uses subcommands (history delete) rather than options (history --delete) for its actions (#3367). You can no longer specify multiple actions via flags (e.g., history --delete --save something).
• New history options have been added, including --max=n to limit the number of history entries, --show-time option to show timestamps (#3175, #3244), and --null to null terminate history entries in the search output.
• history search is now case-insensitive by default (which also affects history delete) (#3236).
• history delete now correctly handles multiline commands (#31).
• Vi-style bindings no longer include all of the default emacs-style bindings; instead, they share some definitions (#3068).
• If there is no locale set in the environment, various known system configuration files will be checked for a default. If no locale can be found, en_US-UTF.8 will be used (#277).
• A number followed by a caret (e.g. 5^) is no longer treated as a redirection (#1873).
• The $version special variable can be overwritten, so that it can be used for other purposes if required.

Notable fixes and improvements

• The fish_realpath builtin has been renamed to realpath and made compatible with GNU realpath when run without arguments (#3400). It is used only for systems without a realpath or grealpath utility (#3374).
• Improved color handling on terminals/consoles with 8-16 colors, particularly the use of bright named color (#3176, #3260).
• fish_indent can now read from files given as arguments, rather than just standard input (#3037).
• Fuzzy tab completions behave in a less surprising manner (#3090, #3211).
• jobs should only print its header line once (#3127).
• Wildcards in redirections are highlighted appropriately (#2789).
• Suggestions will be offered more often, like after removing characters (#3069).
• history --merge now correctly interleaves items in chronological order (#2312).
• Options for fish_indent have been aligned with the other binaries - in particular, -d now means --debug. The --dump option has been renamed to --dump-parse-tree (#3191).
• The display of bindings in the Web-based configuration has been greatly improved (#3325), as has the rendering of prompts (#2924).
• fish should no longer hang using 100% CPU in the C locale (#3214).
• A bug in FreeBSD 11 & 12, Dragonfly BSD & illumos prevented fish from working correctly on these platforms under UTF-8 locales; fish now avoids the buggy behaviour (#3050).
• Prompts which show git repository information (via __fish_git_prompt) are faster in large repositories (#3294) and slow filesystems (#3083).
• fish 2.3.0 reintroduced a problem where the greeting was printed even when using read; this has been corrected again (#3261).
• Vi mode changes the cursor depending on the current mode (#3215).
• Command lines with escaped space characters at the end tab-complete correctly (#2447).
• Added completions for:
  • arcanist (#3256)
  • connmanctl (#3419)
  • figlet (#3378)
  • mdbook (#3378)
  • ninja (#3415)
  • p4, the Perforce client (#3314)
  • pygmentize (#3378)
  • ranger (#3378)
• Improved completions for aura (#3297), abbr (#3267), brew (#3309), chown (#3380, #3383),cygport (#3392), git (#3274, #3226, #3225, #3094, #3087, #3035, #3021, #2982, #3230), kill &pkill(#3200),screen(#3271),wget(#3470), andxz` (#3378).
• Distributors, packagers and developers will notice that the build process produces more succinct output by default; use make V=1 to get verbose output (#3248).
• Improved compatibility with minor platforms including musl (#2988), Cygwin (#2993), Android (#3441, #3442), Haiku (#3322) and Solaris.