svn, update

http://svnbook.red-bean.com/en/1.0/re28.html
You can also update your working copy to an older revision

svn update -r30

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svn diff -rPREV
svn diff file_name -rPREV
svn log --limit
svn log --limit 2 main.css
svn cat -r5323 show.rhtml

svn merge -r7311:7389 svn://svn.icetech.com.tw/serac/youholder/branches/haruko
svn import earlybirds/ svn://bigcat.dlinkddns.com/eb/trunk