How to add an entry to svn:ignore without deleting previous value using Subversion commandline

How to add an entry to svn:ignore without deleting previous value using
Subversion commandline

References

Reference NO 1

http://stackoverflow.com/questions/13648537/how-to-add-an-entry-to-svnignore-without-deleting-previous-value-using-subversi

Reference NO 2

http://stackoverflow.com/questions/116074/how-to-ignore-a-directory-with-svn

Reference NO 3

http://svnbook.red-bean.com/en/1.7/svn.ref.svn.html

Reference NO 4

http://subversion.apache.org/faq.html

Reference NO 5

http://blog.bogojoker.com/2008/07/command-line-svnignore-a-file/

Reference NO 6

http://sdesmedt.wordpress.com/2006/12/10/how-to-make-subversion-ignore-files-and-folders/

Reference NO 7

http://tortoisesvn.net/docs/release/TortoiseSVN_en/tsvn-cli-main.html

Reference NO 8

http://subclipse.tigris.org/svnant/svntask.html