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doc: Improve wording and fix typos in "Features".

* doc/guix.texi (Features): Fix typos, and rephrase according to the
  suggestions of Alex Sassmannshausen <alex.sassmannshausen@gmail.com>.
gn-latest-20200428
Ludovic Courtès 9 years ago
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@ -396,24 +396,25 @@ own directory---something that resembles
Instead of referring to these directories, users have their own
@dfn{profile}, which points to the packages that they actually want to
use. That profile is normally stored in @code{$HOME/.guix-profile}, and
each user has its own profile.
use. These profiles are stored within each user's home directory, at
@code{$HOME/.guix-profile}.
For example, if @code{alice} installed GCC 4.7.2, then
For example, @code{alice} installs GCC 4.7.2. As a result,
@file{/home/alice/.guix-profile/bin/gcc} points to
@file{/nix/store/xxx-gcc-4.7.2/bin/gcc}; on the same machine, @code{bob}
may have installed GCC 4.8.0, in which case its profile refers to these
particular package installation. Both coexist, without any
interference.
@file{/nix/store/@dots{}-gcc-4.7.2/bin/gcc}. Now, on the same machine,
@code{bob} had already installed GCC 4.8.0. The profile of @code{bob}
simply continues to point to
@file{/nix/store/@dots{}-gcc-4.8.0/bin/gcc}---i.e., both versions of GCC
coexist on the same system without any interference.
The @command{guix-package} command is the central tool to manage
packages. It operates on those per-user profiles, and can be used
@emph{with normal user privileges}.
packages (@pxref{Invoking guix-package}). It operates on those per-user
profiles, and can be used @emph{with normal user privileges}.
The command provides the obvious install, remove, and upgrade
operations. Each invocation is actually a @emph{transaction}: either
the specified operation succeeds, or nothing happens. Thus, if the
@command{guix-package} processed is terminated during the transaction,
@command{guix-package} process is terminated during the transaction,
or if a power outage occurs during the transaction, then the user's
profile remains in its previous state, and remains usable.


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