Using the clang command on linux to expand tabs to blanks and set column limit
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From within the current directory, enter:

clang-format -i -style='{IndentWidth: 4, ColumnLimit: 80}' *.cpp *.h

The * applies to all files ending in .cpp and .h.
Sets the indent width to 4 spaces (change to 3 to indent by 3) and the
column limit to 80.

Important note: If you want to view the changes before they're overwritten
to the file, remove the -i option and it'll display your files to the terminal.