csplit: add the --suppress-matched option

With --suppress-matched, the lines that match the pattern will not be
printed in the output files.  I.E. the first line from the second
and subsequent splits will be suppressed.

* src/csplit.c: process_regexp(),process_line_count(): Don't output the
matched lines.  Since csplit includes "up to but not including" matched
lines in each split, the first line (in the next group) is the matched
line - so just skip it.
main(): Handle new option.
usage(): Mention new option.
* doc/coreutils.texi (csplit invocation): Mention new option, examples.
* tests/misc/csplit-suppress-matched.pl: New test script.
* tests/local.mk: Reference the new test.
* NEWS: Mention new feature.

1 files changed, 3 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index b9fc6d2d9..0db53d7e1 100644
--- a/NEWS
+++ b/NEWS
@@ -22,6 +22,9 @@ GNU coreutils NEWS                                    -*- outline -*-
   uniq accepts a new option: --group to print all items, while separating
   unique groups with empty lines.
 
+  csplit accepts a new option: --suppressed-matched, to elide the lines
+  used to identify the split points.
+
 ** Improvements
 
   stat and tail work better with EFIVARFS, EXOFS, F2FS and UBIFS.