(diff.info.gz) Specified Headings

Info Catalog

(diff.info.gz) Sections

(diff.info.gz) C Function Headings

 
 Showing Lines That Match Regular Expressions
 ............................................
 
    To show in which sections differences occur for files that are not
 source code for C or similar languages, use the `-F REGEXP' or
 `--show-function-line=REGEXP' option.  `diff' considers lines that
 match the `grep'-style regular expression REGEXP to be the beginning of
 a section of the file.  Here are suggested regular expressions for some
 common languages:
 
 `^[[:alpha:]$_]'
      C, C++, Prolog
 
 `^('
      Lisp
 
 `^@node'
      Texinfo
 
    This option does not automatically select an output format; in order
 to use it, you must select the context format ( Context Format)
 or unified format ( Unified Format).  In other output formats it
 has no effect.
 
    The `-F' and `--show-function-line' options find the nearest
 unchanged line that precedes each hunk of differences and matches the
 given regular expression.  Then they add that line to the end of the
 line of asterisks in the context format, or to the `@@' line in unified
 format.  If no matching line exists, they leave the output for that
 hunk unchanged.  If that line is more than 40 characters long, they
 output only the first 40 characters.  You can specify more than one
 regular expression for such lines; `diff' tries to match each line
 against each regular expression, starting with the last one given.  This
 means that you can use `-p' and `-F' together, if you wish.
 

Info Catalog

(diff.info.gz) Sections

(diff.info.gz) C Function Headings