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4.3. Getting Help With Subversion

(Adapted from Version Control with Subversion under Creative Commons Attribution License v2.0.)
Before reading on, here is the most important command you ever need when using Subversion: svn help. The Subversion command-line client is self-documenting -- at any time, a quick svn help SUBCOMMAND describes the syntax, options, and behavior of the subcommand.
svn help update
update (up): Bring changes from the repository into the working copy.
usage: update [PATH...]

  If no revision is given, bring working copy up-to-date with HEAD rev.
  Else synchronize working copy to revision given by -r.

  For each updated item a line will start with a character reporting the
  action taken.  These characters have the following meaning: