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alias: expand "$@" as list of parameters quoted individually (BC) (issue4200)...
alias: expand "$@" as list of parameters quoted individually (BC) (issue4200) Before this patch, there was no way to pass in all the positional parameters as separate words down to another command. (1) $@ (without quotes) would expand to all the parameters separated by a space. This would work fine for arguments without spaces, but arguments with spaces in them would be split up by POSIX shells into separate words. (2) '$@' (in single quotes) would expand to all the parameters within a pair of single quotes. POSIX shells would then treat the entire list of arguments as one word. (3) "$@" (in double quotes) would expand similarly to (2). With this patch, we expand "$@" (in double quotes) as all positional parameters, quoted individually with util.shellquote, and separated by spaces. Under standard field-splitting conditions, POSIX shells will tokenize each argument into exactly one word. This is a backwards-incompatible change, but the old behavior was arguably a bug: Bourne-derived shells have expanded "$@" as a tokenized list of positional parameters for a very long time. I could find this behavior specified in IEEE Std 1003.1-2001, and this probably goes back to much further before that.
Jordi Gutiérrez Hermoso - - Load All Authors

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extensions.txt
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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 = !