svn propset svn:ignore "filename"
You might think that’s what you want to do.
However, you will get something like:
~/www/spacevictory pirkka$ svn propset svn:ignore log/call_graph.html
subversion/clients/cmdline/propset-cmd.c:149: (apr_err=205001)
svn: Explicit target required ('log/call_graph.html' interpreted as prop value)
At which point you realise that you are confused about how svn ignore works.
You will study the relevant section in the svn book and type
svn propedit svn:ignore log
and use a default text editor to add the ignored file name/type to the ignored properties of the directory.
Wasn’t that easy, was it? Is there a shortcut that doesn’t involve an editor?