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Date: Tue, 01 Feb 2005 11:19:27 -0700
From: Sanjoy Mahajan <[EMAIL PROTECTED]>
Subject: coreutils: sort -n -u may silently drops a line
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
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Package: coreutils
Version: 5.2.1-2
Severity: minor
File: /usr/bin/sort
With 'input' being the following 2-line file:
fig
bit
The following sort command
$ sort -u -n < input
produces just one line of output:
fig
So the '-n' option makes sort consider 'fig' and 'bit' to be equal.
In the info manual for sort, this behavior is documented for the '-g'
switch:
Use the following collating sequence:
* Lines that do not start with numbers (all considered to be equal).
Perhaps the 'all considered to be equal' note should be added for
'-n'? Or perhaps sort should warn to stderr if it is comparing
non-numbers using -n?
-Sanjoy
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: i386 (i586)
Kernel: Linux 2.4.27-200412041
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages coreutils depends on:
ii libacl1 2.2.23-1 Access control list shared library
ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an
-- no debconf information
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Date: Fri, 23 Dec 2005 14:40:06 +0100
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version=2.60-bugs.debian.org_2005_01_02
5.93 contains the new text:
`-u'
`--unique'
Normally, output only the first of a sequence of lines that compare
equal. For the `--check' (`-c') option, check that no pair of
consecutive lines compares equal.
This option also disables the default last-resort comparison.
The commands `sort -u' and `sort | uniq' are equivalent, but this
equivalence does not extend to arbitrary `sort' options. For
example, `sort -n -u' inspects only the value of the initial
numeric string when checking for uniqueness, whereas `sort -n |
uniq' inspects the entire line. *Note uniq invocation::.
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