How to get svn remote repository URL?

Try this:

svn info | grep URL | sed  's/URL: //g'

Try:

svn info .

This should give some information about the current working copy, including the remote URL.

From the manual, an example output is:

$ svn info foo.c  
Path: foo.c  
Name: foo.c  
URL: http://svn.red-bean.com/repos/test/foo.c  
Repository Root: http://svn.red-bean.com/repos/test  
Repository UUID: 5e7d134a-54fb-0310-bd04-b611643e5c25  
Revision: 4417  
Node Kind: file  
Schedule: normal  
Last Changed Author: sally  
Last Changed Rev: 20  
Last Changed Date: 2003-01-13 16:43:13 -0600 (Mon, 13 Jan 2003)  
Text Last Updated: 2003-01-16 21:18:16 -0600 (Thu, 16 Jan 2003)  
Properties Last Updated: 2003-01-13 21:50:19 -0600 (Mon, 13 Jan 2003)  
Checksum: d6aeb60b0662ccceb6bce4bac344cb66  

As of Subversion 1.9 you can now request a specific item from svn info.

svn info --show-item=url

This will output only the remote url. To get rid of the newline at the end, add this extra option:

svn info --show-item=url --no-newline