This adds a new -D/--all-repeats option to uniq(1), which outputs each copy
of any repeated lines (as opposed to a single copy of a repeated line). You
can specify a separator option to output a blank line before or after each
group of repeated lines. This adds compatibility with the GNU coreutils
version of uniq(1).
This change also re-groups the -c, -d, -D, -u options in the usage display
and man page to indicate that they are mutally exclusive of each other. This
matches the posix/opengroup definition of uniq(1) command line args. Note
that this change does NOT actually enforce the mutual exclusion in the code,
for now, it simply documents that the arguments should be considered
exclusive with each other.
Differential Revision: https://reviews.freebsd.org/D22262
Bring in some bits from NetBSD and lift the restriction in uniq(1) that
-c cannot be used with the -d and -u options. This restriction seems
unnecessary and is supported at least by GNU, OpenBSD, and NetBSD. Lift
the restriction and simplify the show() logic a little bit to maintain
functionality when -c is provided with -d/-u.
Also with this change, -d and -u are now actually a mutually exclusive,
albeit valid, combination. Given that they both indicate opposite
behavior, uniq(1) will no longer output anything if both -d and -u are
supplied. This is in line with NetBSD as well as GNU.
Adjust the man page and usage() to reflect that -c is its own standalone
option.
PR: 200553
Submitted by: Kyle Evans <kevans91@ksu.edu>
Reviewed by: cem, emaste
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D10694
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.
Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
Also add $FreeBSD$ to a few files to keep svn happy.
Discussed with: imp, rwatson
Of particular interest is the fact that LC_COLLATE affects how uniq
determines whether lines are equal. This was the subject of a fairly heated
debate a year or so ago, and it turns out that the current behaviour is
correct and that the standard contained an error.
Now that the standard has been corrected by Cor. 1-2002, refer to 1003.1-2001
instead of the 1992 edition in the Standards section.
