Here are some frequently used svn commands which i regularly use for quick reference.

svn co svn://localhost/svnrepos --username vish
# mark missing files as delete 
svn status | grep ^! | awk '{print " --force "$2}' | xargs svn rm

# add all files
svn add * --force

Some admin commands

# change svn log of a perticualar commit 
svn propset --revprop -r 26 svn:log "Document nap."

# change author of a perticualar svn commit 
svn propset --revprop -r 26 svn:author "vish"

svnadmin create /svnrepos
# add user information 
vim /svnrepos/conf/