# ---------------------------------------------------------------------
# Ignore all the .txt files in the /trunk/Blah/ directory
# ---------------------------------------------------------------------
# Go to the directory
cd trunk/Blah/ # The directory with the files
# Start editing the properties for the current directory
svn propedit svn:ignore . # Opens an editor (SVN_EDITOR, EDITOR)
# Add the following value with a new line, save, and exit:
*.txt
# See that things worked
svn propget svn:ignore . # So you can see the properties
svn status --no-ignore # You should see an 'I' next to the ignored files
# Commit
svn commit -m "New Ignores" # You must commit the new property change