Package: coreutils Version: 8.13-3.5 Severity: normal I was attempting to use uniq to categorise my data based on the first so many characters and I discover that:
a) it is currently impossible to use uniq to output all lines; with lines grouped by initial prefix ( -w N ) and separated by an empty line (--all-repeated=separate) because there is no way to specify outputing all lines b) the combination behaviour of -u -d and -D is odd and suboptimal. Here is an example with a small example dataset: :; cat > uniq-test AAA AAB ABA ABC ACA ADA ADD ADE :; uniq -w 2 -u uniq-test ACA :; uniq -w 2 -d uniq-test AAA ABA ADA :; uniq -w 2 -D uniq-test AAA AAB ABA ABC ADA ADD ADE :; uniq -w 2 -ud uniq-test :; uniq -w 2 -du uniq-test :; uniq -w 2 --all-repeated=separate uniq-test AAA AAB ABA ABC ADA ADD ADE :; uniq -w 2 -u --all-repeated=separate uniq-test AAA ABA ADA ADD :; uniq -w 2 -c -D uniq-test uniq: printing all duplicated lines and repeat counts is meaningless Try `uniq --help' for more information. :; So in summary: -ud or -du produces no output; but doesn't produce an error (where -c -D does) -u -D produces unexpected output (all the repeated lines except the last one for each set). There is no way to output all lines, with separations. There are a number of ways to address this issue; but I think the best one would be to correct behavior and documentation such that: -u outputs any lines which are unique -d outputs the first of any lines which are duplicated -D outputs all lines which are duplicated --all-repeated=METHOD seperates any groups of lines in the specified behavior Such that the output I wanted would be produced with: :; uniq -w 2 -u --all-repeated=separate uniq-test AAA AAB ABA ABC ACA ADA ADD ADE :; Thanks, J. -- System Information: Debian Release: 7.6 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: i386 (i686) Kernel: Linux 3.2.0-4-686-pae (SMP w/2 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages coreutils depends on: ii dpkg 1.16.15 ii install-info 4.13a.dfsg.1-10 ii libacl1 2.2.51-8 ii libattr1 1:2.4.46-8 ii libc6 2.13-38+deb7u4 ii libselinux1 2.1.9-5 coreutils recommends no packages. coreutils suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
