Comparing and Merging Files
184.108.40.206 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 220.127.116.11 Showing Lines That Match Regular Expressions). GNU
diff provides them for the sake of convenience.