create SVN repository locally

1. Create a SVN repository
$ cd 
$ svnadmin create  SVN_REPOSITORY         # create folder SVN_REPOSITORY in $HOME
$ echo `pwd`/SVN_REPOSITORY      # /data/home001/dxu/SVN_REPOSITORY

2. Add stuff into the repository 
# check out the empty repository
$ svn co file:///data/home001/dxu/SVN_REPOSITORY   my_reps
$ cd my_reps   
$ mkdir dir1        # create a folder dir1
$ svn add dir1     # add dir1 into svn repository
$ svn commit -m "" dir1         # commit the change into svn


3. How to use svn copy  
Note:  File bar.txt must NOT exist, otherwise, get error like 
svn: Path 'bar.txt' is not a directory
 

$ svn copy foo.txt bar.txt
A         bar.txt
$ svn status
A  +   bar.txt

OR 

$ svn copy file:///tmp/repos/test/foo.txt  bar.txt

 

$ svn copy near.txt file:///tmp/repos/test/far-away.txt -m "Remote copy." 

$ svn copy file:///tmp/repos/test/far-away near-here
A         near-here

And finally, copying between two URLs:
$ svn copy file:///tmp/repos/test/far-away   file:///tmp/repos/test/over-there -m "remote copy." 

This is the easiest way to “tag” a revision in your repository—just svn copy that revision (usually HEAD) into your tags directory.

$ svn copy file:///tmp/repos/test/trunk file:///tmp/repos/test/tags/0.6.32-prerelease -m "tag tree"

Committed revision 12.

And don't worry if you forgot to tag—you can always specify an older revision and tag anytime:

$ svn copy -r 11 file:///tmp/repos/test/trunk file:///tmp/repos/test/tags/0.6.32-prerelease -m "Forgot to tag at rev 11" 

 Committed revision 13.

Copy a file with specific version 
1) Either way is ok to specify a specific version 
2) File abc / def must NOT exist before copy. 
[dxu@orbit272l ssmis_bufr]$ svn  copy   main_read_ssmis.f90@146      abc
A         abc
[dxu@orbit272l ssmis_bufr]$ svn  copy   -r146  main_read_ssmis.f90    def
A         def
[dxu@orbit272l ssmis_bufr]$ diff   abc   def
[dxu@orbit272l ssmis_bufr]$

Compare different versions of a file

$ slog main_read_ssmis.f90            ## find all versions

$ svn diff  -r 145 main_read_ssmis.f90    ## comp local v.s. r145

$ svn diff -r 146:145 main_read_ssmis.f90   ## comp r146 v.s. r145 

View different versions of a file 

$ scat main_read_ssmis.f90            ## find all versions

$ svn cat  -r145 main_read_ssmis.f90 |less  ## view r145

$ svn cat main_read_ssmis.f90@145    |less  ## view r145