This post is a copy of  the original post. I just want to save a copy in case the owner deletes it.

That makes sense, but I didn’t immediately think of that, and no source sufficiently made that point clear enough. So, if you were struggling, please grasp that concept and take a look at the commands below (which you no doubt have seen and did not think worked) and you’ll really understand what they do.

# ---------------------------------------------------------------------
#      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

# ---------------------------------------------------------------------
#     Ignore a single file secret.txt in the /trunk/ directory
# ---------------------------------------------------------------------

# Go to the directory
cd trunk/

# Add just the single file to the current directories ignore list (like above)
# Note the dot at the end of the command is important
svn propset svn:ignore secret.txt .

# See that things worked
svn propget svn:ignore .    # Notice the single file was added to the list
svn status --no-ignore      # You should see an 'I' next to the ignored files

# Commit
svn commit -m "Its secret"  # You must commit the new property change