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Showing C Function Headings
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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 selects the context output format
(Context Format), with the default number of lines of context. You can
override that number with `-C LINES' later in the command line. You
can override both the format and the number with `-U LINES' later in
the command line.
The `-p' and `--show-c-function' options are equivalent to `-c
-F'^[_a-zA-Z$]'' (Specified Headings). GNU `diff' provides
them for the sake of convenience.