stow/README.md

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README for GNU Stow
===================

This README describes GNU Stow.  This is not the definitive
documentation for Stow; for that, see the [info
manual](https://www.gnu.org/software/stow/manual/).

Stow is a symlink farm manager program which takes distinct sets
of software and/or data located in separate directories on the
filesystem, and makes them all appear to be installed in a single
directory tree.

Originally Stow was born to address the need to administer, upgrade,
install, and remove files in independent software packages without
confusing them with other files sharing the same file system space.
For instance, many years ago it used to be common to compile programs
such as Perl and Emacs from source and install them in `/usr/local`.
By using Stow, `/usr/local/bin` could contain symlinks to files within
`/usr/local/stow/emacs/bin`, `/usr/local/stow/perl/bin` etc., and
likewise recursively for any other subdirectories such as `.../share`,
`.../man`, and so on.

While this is useful for keeping track of system-wide and per-user
installations of software built from source, in more recent times
software packages are often managed by more sophisticated package
management software such as
[`rpm`](https://en.wikipedia.org/wiki/Rpm_(software)),
[`dpkg`](https://en.wikipedia.org/wiki/Dpkg), and
[Nix](https://en.wikipedia.org/wiki/Nix_package_manager) / [GNU
Guix](https://en.wikipedia.org/wiki/GNU_Guix), or language-native
package managers such as Ruby's
[`gem`](https://en.wikipedia.org/wiki/RubyGems), Python's
[`pip`](https://en.wikipedia.org/wiki/Pip_(package_manager)),
Javascript's [`npm`](https://en.wikipedia.org/wiki/Npm_(software)),
and so on.

However Stow is still used not only for software package management,
but also for other purposes, such as facilitating [a more controlled
approach to management of configuration files in the user's home
directory](http://brandon.invergo.net/news/2012-05-26-using-gnu-stow-to-manage-your-dotfiles.html),
especially when [coupled with version control
systems](http://lists.gnu.org/archive/html/info-stow/2011-12/msg00000.html).

Stow was inspired by Carnegie Mellon's Depot program, but is
substantially simpler and safer.  Whereas Depot required database files
to keep things in sync, Stow stores no extra state between runs, so
there's no danger (as there was in Depot) of mangling directories when
file hierarchies don't match the database.  Also unlike Depot, Stow will
never delete any files, directories, or links that appear in a Stow
directory (e.g., `/usr/local/stow/emacs`), so it's always possible
to rebuild the target tree (e.g., `/usr/local`).

Stow is implemented as a combination of a Perl script providing a CLI
interface, and a backend Perl module which does most of the work.

You can get the latest information about Stow from the home page:

    http://www.gnu.org/software/stow/

License
-------

Stow is free software, licensed under the GNU General Public License,
which can be found in the file [`COPYING`](COPYING).

Installation
------------

See [`INSTALL.md`](INSTALL.md) for installation instructions.

Feedback
--------

Please do send comments, questions, and constructive criticism.  The
mailing lists and any other communication channels are detailed on the
above home page.

Brief history
-------------

Stow was inspired by Carnegie Mellon's "Depot" program, but is
substantially simpler.  Whereas Depot requires database files to keep
things in sync, Stow stores no extra state between runs, so there's no
danger (as there is in Depot) of mangling directories when file
hierarchies don't match the database.  Also unlike Depot, Stow will
never delete any files, directories, or links that appear in a Stow
directory (e.g., `/usr/local/stow/emacs`), so it's always possible to
rebuild the target tree (e.g., `/usr/local`).