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2.3.3.2 Showing C Function Headings

To show in which functions differences occur for C and similar languages, you can use the -p or --show-c-function option. This option automatically defaults to the context output format (see section 2.3.1 Context Format), with the default number of lines of context. You can override that number with -C lines elsewhere in the command line. You can override both the format and the number with -U lines elsewhere in the command line.

The -p and --show-c-function options are equivalent to -F '^[[:alpha:]$_]' if the unified format is specified, otherwise -c -F '^[[:alpha:]$_]' (see section 2.3.3.1 Showing Lines That Match Regular Expressions). GNU diff provides them for the sake of convenience.