On 12/25/2011 12:54 PM, Adrien Kunysz wrote: > * doc/coreutils.texi: document the new feature > * src/uniq.c (find_end): new function > (check_file): use find_end() to determine when to stop comparing > (usage): document the new feature > (main): expose the new feature to user > * tests/misc/uniq: add tests to exercise the new code > --- > doc/coreutils.texi | 17 +++++++++++++ > src/uniq.c | 69 > +++++++++++++++++++++++++++++++++++++++++++++++++--- > tests/misc/uniq | 15 +++++++++++ > 3 files changed, 97 insertions(+), 4 deletions(-) > > I have recently found myself wishing I could have uniq(1) skip > the last N fields before comparison. I am aware of the rev(1) trick > but I don't find it very satisfactory. So I ended up patching uniq > and implementing the feature for characters skipping as well. > > Documentation and tests included. Tests have also been run within > Valgrind on x86_64.
Thank you for being so thorough. Hmm, this is quite unusual functionality. I was about to merge this with a previous feature request: http://debbugs.gnu.org/5832 But in fact supporting --key would not provide this functionality. Why does `rev | uniq -f | rev` not suffice for you? BTW you would need to start the copyright assignment process for this feature, but we'd have to decide if it generally useful enough to proceed. Perhaps a concrete example would help. cheers, Pádraig.
