svn ignore a file

The property is set on a directory. Below I created a file abc.txt and set svn:ignore on it:

$ touch abc.txt
$ svn propset svn:ignore abc.txt .
property 'svn:ignore' set on '.'
$ svn propget svn:ignore .
abc.txt

$ svn status --no-ignore
I      abc.txt
 M     .

Add with an editor:

svn propedit svn:ignore .