Short help:

  $ hg

  Mercurial Distributed SCM

  basic commands:

   add           add the specified files on the next commit

   annotate      show changeset information by line for each file

   clone         make a copy of an existing repository

   commit        commit the specified files or all outstanding changes

   diff          diff repository (or selected files)

   export        dump the header and diffs for one or more changesets

   forget        forget the specified files on the next commit

   init          create a new repository in the given directory

   log           show revision history of entire repository or files

   merge         merge another revision into working directory

   pull          pull changes from the specified source

   push          push changes to the specified destination

   remove        remove the specified files on the next commit

   serve         start stand-alone webserver

   status        show changed files in the working directory

   summary       summarize working directory state

   update        update working directory (or switch revisions)

  (use 'hg help' for the full list of commands or 'hg -v' for details)

  $ hg -q

   add           add the specified files on the next commit

   annotate      show changeset information by line for each file

   clone         make a copy of an existing repository

   commit        commit the specified files or all outstanding changes

   diff          diff repository (or selected files)

   export        dump the header and diffs for one or more changesets

   forget        forget the specified files on the next commit

   init          create a new repository in the given directory

   log           show revision history of entire repository or files

   merge         merge another revision into working directory

   pull          pull changes from the specified source

   push          push changes to the specified destination

   remove        remove the specified files on the next commit

   serve         start stand-alone webserver

   status        show changed files in the working directory

   summary       summarize working directory state

   update        update working directory (or switch revisions)

Extra extensions will be printed in help output in a non-reliable order since

the extension is unknown.

#if no-extraextensions

  $ hg help

  Mercurial Distributed SCM

  list of commands:

   backout       reverse effect of earlier changeset

   bookmarks     create a new bookmark or list existing bookmarks

   branch        set or show the current branch name

   branches      list repository named branches

   cat           output the current or given revision of files

   copy          mark files as copied for the next commit

   diff          diff repository (or selected files)

   files         list tracked files

   forget        forget the specified files on the next commit

   remove        remove the specified files on the next commit

   rename        rename files; equivalent of copy + remove

   resolve       redo merges or set/view the merge status of files

   revert        restore files to their checkout state

   root          print the root (top) of the current working directory

   status        show changed files in the working directory

   summary       summarize working directory state

   unbundle      apply one or more bundle files

   verify        verify the integrity of the repository

   version       output version and copyright information

  additional help topics:

   bundlespec    Bundle File Formats

   color         Colorizing Outputs

   config        Configuration Files

   dates         Date Formats

   deprecated    Deprecated Features

   diffs         Diff Formats

   environment   Environment Variables

   extensions    Using Additional Features

   filesets      Specifying File Sets

   flags         Command-line flags

   glossary      Glossary

   hgignore      Syntax for Mercurial Ignore Files

   hgweb         Configuring hgweb

   internals     Technical implementation topics

   merge-tools   Merge Tools

   pager         Pager Support

   patterns      File Name Patterns

   phases        Working with Phases

   revisions     Specifying Revisions

   scripting     Using Mercurial from scripts and automation

   subrepos      Subrepositories

   templating    Template Usage

   urls          URL Paths

  (use 'hg help -v' to show built-in aliases and global options)

  $ hg -q help

   backout       reverse effect of earlier changeset

   bookmarks     create a new bookmark or list existing bookmarks

   branch        set or show the current branch name

   branches      list repository named branches

   cat           output the current or given revision of files

   copy          mark files as copied for the next commit

   diff          diff repository (or selected files)

   files         list tracked files

   forget        forget the specified files on the next commit

   remove        remove the specified files on the next commit

   rename        rename files; equivalent of copy + remove

   resolve       redo merges or set/view the merge status of files

   revert        restore files to their checkout state

   root          print the root (top) of the current working directory

   status        show changed files in the working directory

   summary       summarize working directory state

   unbundle      apply one or more bundle files

   verify        verify the integrity of the repository

   version       output version and copyright information

  additional help topics:

   bundlespec    Bundle File Formats

   color         Colorizing Outputs

   config        Configuration Files

   dates         Date Formats

   deprecated    Deprecated Features

   diffs         Diff Formats

   environment   Environment Variables

   extensions    Using Additional Features

   filesets      Specifying File Sets

   flags         Command-line flags

   glossary      Glossary

   hgignore      Syntax for Mercurial Ignore Files

   hgweb         Configuring hgweb

   internals     Technical implementation topics

   merge-tools   Merge Tools

   pager         Pager Support

   patterns      File Name Patterns

   phases        Working with Phases

   revisions     Specifying Revisions

   scripting     Using Mercurial from scripts and automation

   subrepos      Subrepositories

   templating    Template Usage

   urls          URL Paths

Test extension help:

  $ hg help extensions --config extensions.rebase= --config extensions.children=

  Using Additional Features

  """""""""""""""""""""""""

      Mercurial has the ability to add new features through the use of

      extensions. Extensions may add new commands, add options to existing

      commands, change the default behavior of commands, or implement hooks.

      To enable the "foo" extension, either shipped with Mercurial or in the

      Python search path, create an entry for it in your configuration file,

      like this:

        [extensions]

        foo =

      You may also specify the full path to an extension:

        [extensions]

        myfeature = ~/.hgext/myfeature.py

      See 'hg help config' for more information on configuration files.

      Extensions are not loaded by default for a variety of reasons: they can

      increase startup overhead; they may be meant for advanced usage only; they

      may provide potentially dangerous abilities (such as letting you destroy

      or modify history); they might not be ready for prime time; or they may

      alter some usual behaviors of stock Mercurial. It is thus up to the user

      to activate extensions as needed.

      To explicitly disable an extension enabled in a configuration file of

      broader scope, prepend its path with !:

        [extensions]

        # disabling extension bar residing in /path/to/extension/bar.py

        bar = !/path/to/extension/bar.py

        # ditto, but no path was supplied for extension baz

        baz = !

      enabled extensions:

       children      command to display child changesets (DEPRECATED)

       rebase        command to move sets of revisions to a different ancestor

      disabled extensions:

       acl           hooks for controlling repository access

       blackbox      log repository events to a blackbox for debugging

       bugzilla      hooks for integrating with the Bugzilla bug tracker

       censor        erase file content at a given revision

       churn         command to display statistics about repository history

       clonebundles  advertise pre-generated bundles to seed clones

       closehead     close arbitrary heads without checking them out first

       convert       import revisions from foreign VCS repositories into

                     Mercurial

       eol           automatically manage newlines in repository files

       extdiff       command to allow external programs to compare revisions

       factotum      http authentication with factotum

       githelp       try mapping git commands to Mercurial commands

       gpg           commands to sign and verify changesets

       hgk           browse the repository in a graphical way

       highlight     syntax highlighting for hgweb (requires Pygments)

       histedit      interactive history editing

       keyword       expand keywords in tracked files

       largefiles    track large binary files

       mq            manage a stack of patches

       notify        hooks for sending email push notifications

       patchbomb     command to send changesets as (a series of) patch emails

       purge         command to delete untracked files from the working

                     directory

       relink        recreates hardlinks between repository clones

       schemes       extend schemes with shortcuts to repository swarms

       share         share a common history between several working directories

       shelve        save and restore changes to the working directory

       strip         strip changesets and their descendants from history

       transplant    command to transplant changesets from another branch

       win32mbcs     allow the use of MBCS paths with problematic encodings

       zeroconf      discover and advertise repositories on the local network

#endif

Verify that deprecated extensions are included if --verbose:

  $ hg -v help extensions | grep children

       children      command to display child changesets (DEPRECATED)

Verify that extension keywords appear in help templates

  $ hg help --config extensions.transplant= templating|grep transplant > /dev/null