<p>What do the result codes in SVN mean? I need a quick reference.</p>

For additional details see the SVNBook:
"Status of working copy files and directories"
.
The common statuses:
U
: Working file was updated
G
: Changes on the repo were automatically merged into the working copy
M
: Working copy is modified
C
: This file conflicts with the version in the repo
?
: This file is not under version control
!
: This file is under version control but is missing or incomplete
A
: This file will be added to version control (after commit)
A+
: This file will be moved (after commit)
D
: This file will be deleted (after commit)
S
: This signifies that the file or directory has been switched from the path of the rest of the working copy (using svn switch) to a
  branch
I
: Ignored
X
: External definition
~
: Type changed
R
: Item has been replaced in your working copy. This means the file was scheduled for deletion, and then a new file with the same name was scheduled for addition in its place.
L
: Item is locked
E
: Item existed, as it would have been created, by an svn update.