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diff --git a/tests/misc/sort.pl b/tests/misc/sort.pl
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+#!/usr/bin/perl
+
+# Copyright (C) 2008-2016 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+use strict;
+
+my $limits = getlimits ();
+
+my $prog = 'sort';
+
+# Turn off localization of executable's output.
+@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
+
+my $mb_locale = $ENV{LOCALE_FR_UTF8};
+! defined $mb_locale || $mb_locale eq 'none'
+ and $mb_locale = 'C';
+
+# Since each test is run with a file name and with redirected stdin,
+# the name in the diagnostic is either the file name or "-".
+# Normalize each diagnostic to use '-'.
+my $normalize_filename = {ERR_SUBST => 's/^$prog: .*?:/$prog: -:/'};
+
+my $no_file = "$prog: cannot read: no-file: No such file or directory\n";
+
+my @Tests =
+(
+["n1", '-n', {IN=>".01\n0\n"}, {OUT=>"0\n.01\n"}],
+["n2", '-n', {IN=>".02\n.01\n"}, {OUT=>".01\n.02\n"}],
+["n3", '-n', {IN=>".02\n.00\n"}, {OUT=>".00\n.02\n"}],
+["n4", '-n', {IN=>".02\n.000\n"}, {OUT=>".000\n.02\n"}],
+["n5", '-n', {IN=>".021\n.029\n"}, {OUT=>".021\n.029\n"}],
+
+["n6", '-n', {IN=>".02\n.0*\n"}, {OUT=>".0*\n.02\n"}],
+["n7", '-n', {IN=>".02\n.*\n"}, {OUT=>".*\n.02\n"}],
+["n8a", '-s -n -k1,1', {IN=>".0a\n.0b\n"}, {OUT=>".0a\n.0b\n"}],
+["n8b", '-s -n -k1,1', {IN=>".0b\n.0a\n"}, {OUT=>".0b\n.0a\n"}],
+["n9a", '-s -n -k1,1', {IN=>".000a\n.000b\n"}, {OUT=>".000a\n.000b\n"}],
+["n9b", '-s -n -k1,1', {IN=>".000b\n.000a\n"}, {OUT=>".000b\n.000a\n"}],
+["n10a", '-s -n -k1,1', {IN=>".00a\n.000b\n"}, {OUT=>".00a\n.000b\n"}],
+["n10b", '-s -n -k1,1', {IN=>".00b\n.000a\n"}, {OUT=>".00b\n.000a\n"}],
+["n11a", '-s -n -k1,1', {IN=>".01a\n.010\n"}, {OUT=>".01a\n.010\n"}],
+["n11b", '-s -n -k1,1', {IN=>".010\n.01a\n"}, {OUT=>".010\n.01a\n"}],
+
+# human readable suffixes
+["h1", '-h',
+ {IN=>"1Y\n1Z\n1E\n1P\n1T\n1G\n1M\n1K\n02\n1\nY\n-1k\n-1M\n-1G\n-1T\n"
+ . "-1P\n-1E\n-1Z\n-1Y\n"},
+ {OUT=>"-1Y\n-1Z\n-1E\n-1P\n-1T\n-1G\n-1M\n-1k\nY\n1\n02\n1K\n1M\n1G\n1T\n"
+ . "1P\n1E\n1Z\n1Y\n"}],
+["h2", '-h', {IN=>"1M\n-2G\n-3K"}, {OUT=>"-2G\n-3K\n1M\n"}],
+# check that it works with powers of 1024
+["h3", '-k 2,2h -k 1,1', {IN=>"a 1G\nb 1023M\n"}, {OUT=>"b 1023M\na 1G\n"}],
+# decimal at end => allowed
+["h4", '-h', {IN=>"1.E\n2.M\n"}, {OUT=>"2.M\n1.E\n"}],
+# double decimal => ignore suffix
+["h5", '-h', {IN=>"1..2E\n2..2M\n"}, {OUT=>"1..2E\n2..2M\n"}],
+# "M" sorts before "G" regardless of the positive number attached.
+["h6", '-h', {IN=>"1GiB\n1030MiB\n"}, {OUT=>"1030MiB\n1GiB\n"}],
+# check option incompatibility
+["h7", '-hn', {IN=>""}, {OUT=>""}, {EXIT=>2},
+ {ERR=>"$prog: options '-hn' are incompatible\n"}],
+# check key processing
+["h8", '-n -k2,2h', {IN=>"1 1E\n2 2M\n"}, {OUT=>"2 2M\n1 1E\n"}],
+# SI and IEC prefixes on separate keys allowed
+["h9", '-h -k1,1 -k2,2', {IN=>"1M 1Mi\n1M 1Mi\n"}, {OUT=>"1M 1Mi\n1M 1Mi\n"}],
+# This invalid SI and IEC prefix mixture is not significant so not noticed
+["h10", '-h -k1,1 -k2,2', {IN=>"1M 2M\n2M 1Mi\n"}, {OUT=>"1M 2M\n2M 1Mi\n"}],
+
+["01a", '', {IN=>"A\nB\nC\n"}, {OUT=>"A\nB\nC\n"}],
+#
+["02a", '-c', {IN=>"A\nB\nC\n"}, {OUT=>''}],
+["02b", '-c', {IN=>"A\nC\nB\n"}, {OUT=>''}, {EXIT=>1},
+ {ERR=>"$prog: -:3: disorder: B\n"}, $normalize_filename],
+["02c", '-c -k1,1', {IN=>"a\na b\n"}, {OUT=>''}],
+["02d", '-C', {IN=>"A\nB\nC\n"}, {OUT=>''}],
+["02e", '-C', {IN=>"A\nC\nB\n"}, {OUT=>''}, {EXIT=>1}],
+# This should fail because there are duplicate keys
+["02m", '-cu', {IN=>"A\nA\n"}, {OUT=>''}, {EXIT=>1},
+ {ERR=>"$prog: -:2: disorder: A\n"}, $normalize_filename],
+["02n", '-cu', {IN=>"A\nB\n"}, {OUT=>''}],
+["02o", '-cu', {IN=>"A\nB\nB\n"}, {OUT=>''}, {EXIT=>1},
+ {ERR=>"$prog: -:3: disorder: B\n"}, $normalize_filename],
+["02p", '-cu', {IN=>"B\nA\nB\n"}, {OUT=>''}, {EXIT=>1},
+ {ERR=>"$prog: -:2: disorder: A\n"}, $normalize_filename],
+["02q", '-c -k 1,1fR', {IN=>"ABC\nABc\nAbC\nAbc\naBC\naBc\nabC\nabc\n"}],
+["02r", '-c -k 1,1fV', {IN=>"ABC\nABc\nAbC\nAbc\naBC\naBc\nabC\nabc\n"}],
+["02s", '-c -k 1,1dfR',
+ {IN=>".ABC\n.ABc.\nA.bC\nA.bc.\naB.C\naB.c.\nabC.\nabc..\n"}],
+#
+["03a", '-k1', {IN=>"B\nA\n"}, {OUT=>"A\nB\n"}],
+["03b", '-k1,1', {IN=>"B\nA\n"}, {OUT=>"A\nB\n"}],
+["03c", '-k1 -k2', {IN=>"A b\nA a\n"}, {OUT=>"A a\nA b\n"}],
+# Fail with a diagnostic when -k specifies field == 0.
+["03d", '-k0', {EXIT=>2},
+ {ERR=>"$prog: -: invalid field specification '0'\n"},
+ $normalize_filename],
+# Fail with a diagnostic when -k specifies character == 0.
+["03e", '-k1.0', {EXIT=>2},
+ {ERR=>"$prog: character offset is zero: invalid field specification '1.0'\n"}],
+["03f", '-k1.1,-k0', {EXIT=>2},
+ {ERR=>"$prog: invalid number after ',': invalid count at start of '-k0'\n"}],
+# This is ok.
+["03g", '-k1.1,1.0', {IN=>''}],
+# This is equivalent to 3f.
+["03h", '-k1.1,1', {IN=>''}],
+# This too, is equivalent to 3f.
+["03i", '-k1,1', {IN=>''}],
+#
+["04a", '-nc', {IN=>"2\n11\n"}],
+["04b", '-n', {IN=>"11\n2\n"}, {OUT=>"2\n11\n"}],
+["04c", '-k1n', {IN=>"11\n2\n"}, {OUT=>"2\n11\n"}],
+["04d", '-k1', {IN=>"11\n2\n"}, {OUT=>"11\n2\n"}],
+["04e", '-k2', {IN=>"ignored B\nz-ig A\n"}, {OUT=>"z-ig A\nignored B\n"}],
+#
+["05a", '-k1,2', {IN=>"A B\nA A\n"}, {OUT=>"A A\nA B\n"}],
+["05b", '-k1,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["05c", '-k1 -k2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["05d", '-k2,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["05e", '-k2,2', {IN=>"A B Z\nA A A\n"}, {OUT=>"A A A\nA B Z\n"}],
+["05f", '-k2,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+#
+["06a", '-k 1,2', {IN=>"A B\nA A\n"}, {OUT=>"A A\nA B\n"}],
+["06b", '-k 1,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["06c", '-k 1 -k 2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["06d", '-k 2,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+["06e", '-k 2,2', {IN=>"A B Z\nA A A\n"}, {OUT=>"A A A\nA B Z\n"}],
+["06f", '-k 2,2', {IN=>"A B A\nA A Z\n"}, {OUT=>"A A Z\nA B A\n"}],
+#
+["07a", '-k 2,3', {IN=>"9 a b\n7 a a\n"}, {OUT=>"7 a a\n9 a b\n"}],
+["07b", '-k 2,3', {IN=>"a a b\nz a a\n"}, {OUT=>"z a a\na a b\n"}],
+["07c", '-k 2,3', {IN=>"y k b\nz k a\n"}, {OUT=>"z k a\ny k b\n"}],
+["07d", '+1 -3', {IN=>"y k b\nz k a\n"}, {OUT=>"z k a\ny k b\n"}],
+# ensure a character position of 0 includes whole field
+["07e", '-k 2,3.0', {IN=>"a a b\nz a a\n"}, {OUT=>"z a a\na a b\n"}],
+# ensure fields with end position before start are ignored
+["07f", '-n -k1.3,1.1', {IN=>"a 2\nb 1\n"}, {OUT=>"a 2\nb 1\n"}],
+["07g", '-n -k2.2,1.2', {IN=>"aa 2\nbb 1\n"}, {OUT=>"aa 2\nbb 1\n"}],
+["07h", '-k1.3nb,1.3', {IN=>" a 2\n b 1\n"}, {OUT=>" a 2\n b 1\n"}],
+# ensure obsolescent key limits are handled correctly
+["07i", '-s +0 -1', {IN=>"a c\na b\n"}, {OUT=>"a c\na b\n"}],
+["07j", '-s +0 -1.0', {IN=>"a c\na b\n"}, {OUT=>"a c\na b\n"}],
+["07k", '-s +0 -1.1', {IN=>"a c\na b\n"}, {OUT=>"a c\na b\n"}],
+["07l", '-s +0 -1.2', {IN=>"a c\na b\n"}, {OUT=>"a b\na c\n"}],
+["07m", '-s +0 -1.1b', {IN=>"a c\na b\n"}, {OUT=>"a b\na c\n"}],
+#
+# report an error for '.' without following char spec
+["08a", '-k 2.,3', {EXIT=>2},
+ {ERR=>"$prog: invalid number after '.': invalid count at start of ',3'\n"}],
+# report an error for ',' without following POS2
+["08b", '-k 2,', {EXIT=>2},
+ {ERR=>"$prog: invalid number after ',': invalid count at start of ''\n"}],
+#
+# Test new -g option.
+["09a", '-g', {IN=>"1e2\n2e1\n"}, {OUT=>"2e1\n1e2\n"}],
+# Make sure -n works how we expect.
+["09b", '-n', {IN=>"1e2\n2e1\n"}, {OUT=>"1e2\n2e1\n"}],
+["09c", '-n', {IN=>"2e1\n1e2\n"}, {OUT=>"1e2\n2e1\n"}],
+["09d", '-k2g', {IN=>"a 1e2\nb 2e1\n"}, {OUT=>"b 2e1\na 1e2\n"}],
+#
+# Bug reported by Roger Peel <R.Peel@ee.surrey.ac.uk>
+["10a", '-t : -k 2.2,2.2', {IN=>":ba\n:ab\n"}, {OUT=>":ba\n:ab\n"}],
+# Equivalent to above, but using obsolescent '+pos -pos' option syntax.
+["10b", '-t : +1.1 -1.2', {IN=>":ba\n:ab\n"}, {OUT=>":ba\n:ab\n"}],
+#
+# The same as the preceding two, but with input lines reversed.
+["10c", '-t : -k 2.2,2.2', {IN=>":ab\n:ba\n"}, {OUT=>":ba\n:ab\n"}],
+# Equivalent to above, but using obsolescent '+pos -pos' option syntax.
+["10d", '-t : +1.1 -1.2', {IN=>":ab\n:ba\n"}, {OUT=>":ba\n:ab\n"}],
+# Try without -t...
+# But note that we have to count the delimiting space at the beginning
+# of each field that has it.
+["10a0", '-k 2.3,2.3', {IN=>"z ba\nz ab\n"}, {OUT=>"z ba\nz ab\n"}],
+["10a1", '-k 1.2,1.2', {IN=>"ba\nab\n"}, {OUT=>"ba\nab\n"}],
+["10a2", '-b -k 2.2,2.2', {IN=>"z ba\nz ab\n"}, {OUT=>"z ba\nz ab\n"}],
+#
+# An even simpler example demonstrating the bug.
+["10e", '-k 1.2,1.2', {IN=>"ab\nba\n"}, {OUT=>"ba\nab\n"}],
+#
+# The way sort works on these inputs (10f and 10g) seems wrong to me.
+# See http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=3c467c0d223
+# POSIX doesn't seem to say one way or the other, but that's the way all
+# other sort implementations work.
+["10f", '-t : -k 1.3,1.3', {IN=>":ab\n:ba\n"}, {OUT=>":ba\n:ab\n"}],
+["10g", '-k 1.4,1.4', {IN=>"a ab\nb ba\n"}, {OUT=>"b ba\na ab\n"}],
+#
+# Exercise bug re using -b to skip trailing blanks.
+["11a", '-t: -k1,1b -k2,2', {IN=>"a\t:a\na :b\n"}, {OUT=>"a\t:a\na :b\n"}],
+["11b", '-t: -k1,1b -k2,2', {IN=>"a :b\na\t:a\n"}, {OUT=>"a\t:a\na :b\n"}],
+["11c", '-t: -k2,2b -k3,3', {IN=>"z:a\t:a\na :b\n"}, {OUT=>"z:a\t:a\na :b\n"}],
+# Before 1.22m, the first key comparison reported equality.
+# With 1.22m, they compare different: "a" sorts before "a\n",
+# and the second key spec isn't even used.
+["11d", '-t: -k2,2b -k3,3', {IN=>"z:a :b\na\t:a\n"}, {OUT=>"a\t:a\nz:a :b\n"}],
+#
+# Exercise bug re comparing '-' and integers.
+["12a", '-n -t: +1', {IN=>"a:1\nb:-\n"}, {OUT=>"b:-\na:1\n"}],
+["12b", '-n -t: +1', {IN=>"b:-\na:1\n"}, {OUT=>"b:-\na:1\n"}],
+# Try some other (e.g. 'X') invalid character.
+["12c", '-n -t: +1', {IN=>"a:1\nb:X\n"}, {OUT=>"b:X\na:1\n"}],
+["12d", '-n -t: +1', {IN=>"b:X\na:1\n"}, {OUT=>"b:X\na:1\n"}],
+# From Karl Heuer
+["13a", '+0.1n', {IN=>"axx\nb-1\n"}, {OUT=>"b-1\naxx\n"}],
+["13b", '+0.1n', {IN=>"b-1\naxx\n"}, {OUT=>"b-1\naxx\n"}],
+#
+# From Carl Johnson <carlj@cjlinux.home.org>
+["14a", '-d -u', {IN=>"mal\nmal-\nmala\n"}, {OUT=>"mal\nmala\n"}],
+# Be sure to fix the (translate && ignore) case in keycompare.
+["14b", '-f -d -u', {IN=>"mal\nmal-\nmala\n"}, {OUT=>"mal\nmala\n"}],
+#
+# Experiment with -i.
+["15a", '-i -u', {IN=>"a\na\1\n"}, {OUT=>"a\n"}],
+["15b", '-i -u', {IN=>"a\n\1a\n"}, {OUT=>"a\n"}],
+["15c", '-i -u', {IN=>"a\1\na\n"}, {OUT=>"a\1\n"}],
+["15d", '-i -u', {IN=>"\1a\na\n"}, {OUT=>"\1a\n"}],
+["15e", '-i -u', {IN=>"a\n\1\1\1\1\1a\1\1\1\1\n"}, {OUT=>"a\n"}],
+
+# This would fail (printing only the 7) for 8.6..8.18.
+# Use --parallel=1 for reproducibility, and a small buffer size
+# to let us trigger the problem with a smaller input.
+["unique-1", '--p=1 -S32b -u', {IN=>"7\n"x11 . "1\n"}, {OUT=>"1\n7\n"}],
+# Demonstrate that 8.19's key-spec-adjusting code is required.
+# These are more finicky in that they are arch-dependent.
+["unique-key-i686", '-u -k2,2 --p=1 -S32b',
+ {IN=>"a 7\n"x10 . "b 1\n"}, {OUT=>"b 1\na 7\n"}],
+["unique-key-x86_64", '-u -k2,2 --p=1 -S32b',
+ {IN=>"a 7\n"x11 . "b 1\n"}, {OUT=>"b 1\na 7\n"}],
+# Before 8.19, this would trigger a free-memory read.
+["unique-free-mem-read", '-u --p=1 -S32b',
+ {IN=>"a\n"."b"x900 ."\n"},
+ {OUT=>"a\n"."b"x900 ."\n"}],
+
+# From Erick Branderhorst -- fixed around 1.19e
+["16a", '-f',
+ {IN=>"éminence\nüberhaupt\n's-Gravenhage\naëroclub\nAag\naagtappels\n"},
+ {OUT=>"'s-Gravenhage\nAag\naagtappels\naëroclub\néminence\nüberhaupt\n"}],
+
+# This provokes a one-byte memory overrun of a malloc'd block for versions
+# of sort from textutils-1.19p and before.
+["17", '-c', {IN=>"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n"}],
+
+# POSIX says -n no longer implies -b, so here we're comparing ' 9' and '10'.
+["18a", '-k1.1,1.2n', {IN=>" 901\n100\n"}, {OUT=>" 901\n100\n"}],
+
+# Just like above, because the global '-b' has no effect on the
+# key specifier when a key-specific option ('n' in this case) is used.
+["18b", '-b -k1.1,1.2n', {IN=>" 901\n100\n"}, {OUT=>" 901\n100\n"}],
+
+# Here we're comparing ' 90' and '10', because the 'b' on the key-end specifier
+# makes sort ignore leading blanks when determining that key's *end*.
+["18c", '-k1.1,1.2nb', {IN=>" 901\n100\n"}, {OUT=>"100\n 901\n"}],
+
+# Here we're comparing '9' and '10', because the 'b' on the key-start specifier
+# makes sort ignore leading blanks when determining that key's *start*.
+["18d", '-k1.1b,1.2n', {IN=>" 901\n100\n"}, {OUT=>" 901\n100\n"}],
+
+# This compares '90' and '10', as it ignores leading blanks for both
+# key start and key end.
+["18e", '-nb -k1.1,1.2', {IN=>" 901\n100\n"}, {OUT=>"100\n 901\n"}],
+
+# When ignoring leading blanks for end position, ensure blanks from
+# next field are not included in the sort. I.e., order should not change here.
+["18f", '-k1,1b', {IN=>"a y\na z\n"}, {OUT=>"a y\na z\n"}],
+
+# When ignoring leading blanks for start position, ensure blanks from
+# next field are not included in the sort. I.e., order should not change here.
+# This was noticed as an issue on fedora 8 (only in multibyte locales).
+["18g", '-k1b,1', {IN=>"a y\na z\n"}, {OUT=>"a y\na z\n"},
+ {ENV => "LC_ALL=$mb_locale"}],
+
+# This looks odd, but works properly -- 2nd keyspec is never
+# used because all lines are different.
+["19a", '+0 +1nr', {IN=>"b 2\nb 1\nb 3\n"}, {OUT=>"b 1\nb 2\nb 3\n"}],
+
+# The test *intended* by the author of the above, but using the
+# more-intuitive POSIX-style -k options.
+["19b", '-k1,1 -k2nr', {IN=>"b 2\nb 1\nb 3\n"}, {OUT=>"b 3\nb 2\nb 1\n"}],
+
+# This test failed when sort-1.22 was compiled on a Next x86 system
+# without optimization. Without optimization gcc uses the buggy version
+# of memcmp in the Next C library. With optimization, gcc uses its
+# (working) builtin version. Test case form William Lewis.
+["20a", '',
+ {IN=>"_________U__free\n_________U__malloc\n_________U__abort\n"
+ . "_________U__memcpy\n_________U__memset\n"
+ . "_________U_dyld_stub_binding_helper\n_________U__malloc\n"
+ . "_________U___iob\n_________U__abort\n_________U__fprintf\n"},
+ {OUT=>"_________U___iob\n_________U__abort\n_________U__abort\n"
+ . "_________U__fprintf\n_________U__free\n_________U__malloc\n"
+ . "_________U__malloc\n_________U__memcpy\n_________U__memset\n"
+ . "_________U_dyld_stub_binding_helper\n"}],
+
+# Demonstrate that folding changes the ordering of e.g. A, a, and _
+# because while they normally (in the C locale) collate like A, _, a,
+# when using -f, 'a' is compared as if it were 'A'.
+["21a", '', {IN=>"A\na\n_\n"}, {OUT=>"A\n_\na\n"}],
+["21b", '-f', {IN=>"A\na\n_\n"}, {OUT=>"A\na\n_\n"}],
+["21c", '-f', {IN=>"a\nA\n_\n"}, {OUT=>"A\na\n_\n"}],
+["21d", '-f', {IN=>"_\na\nA\n"}, {OUT=>"A\na\n_\n"}],
+["21e", '-f', {IN=>"a\n_\nA\n"}, {OUT=>"A\na\n_\n"}],
+["21f", '-fs', {IN=>"A\na\n_\n"}, {OUT=>"A\na\n_\n"}],
+["21g", '-fu', {IN=>"a\n_\n"}, {OUT=>"a\n_\n"}],
+
+# This test failed until 1.22f. From Zvi Har'El.
+["22a", '-k 2,2fd -k 1,1r', {IN=>"3 b\n4 B\n"}, {OUT=>"4 B\n3 b\n"}],
+["22b", '-k 2,2d -k 1,1r', {IN=>"3 b\n4 b\n"}, {OUT=>"4 b\n3 b\n"}],
+
+# This fails in Fedora 20, per Göran Uddeborg in: http://bugs.gnu.org/18540
+["23", '-s -k1,1 -t/', {IN=>"a b/x\na-b-c/x\n"}, {OUT=>"a b/x\na-b-c/x\n"},
+ {ENV => "LC_ALL=$mb_locale"}],
+
+["no-file1", 'no-file', {EXIT=>2}, {ERR=>$no_file}],
+# This test failed until 1.22f. Sort didn't give an error.
+# From Will Edgington.
+["o-no-file1", qw(-o no-file no-file), {EXIT=>2}, {ERR=>$no_file}],
+
+["create-empty", qw(-o no/such/file /dev/null), {EXIT=>2},
+ {ERR=>"$prog: open failed: no/such/file: No such file or directory\n"}],
+
+# From Paul Eggert. This was fixed in textutils-1.22k.
+["neg-nls", '-n', {IN=>"-1\n-9\n"}, {OUT=>"-9\n-1\n"}],
+
+# From Paul Eggert. This was fixed in textutils-1.22m.
+# The bug was visible only when using the internationalized sorting code
+# (i.e., not when configured with --disable-nls).
+["nul-nls", '', {IN=>"\0b\n\0a\n"}, {OUT=>"\0a\n\0b\n"}],
+
+# Paul Eggert wrote:
+# A previous version of POSIX incorrectly required that the newline
+# at the end of the input line contributed to the sort, which would
+# mean that an empty line should sort after a line starting with a tab
+# (because \t precedes \n in the ASCII collating sequence).
+# GNU 'sort' was altered to do this, but was changed back once it
+# was discovered to be a POSIX bug (and the POSIX bug was fixed).
+# Check that 'sort' conforms to the fixed POSIX, not to the buggy one.
+["use-nl", '', {IN=>"\n\t\n"}, {OUT=>"\n\t\n"}],
+
+# Specifying two -o options should evoke a failure
+["o2", qw(-o x -o y), {EXIT=>2},
+ {ERR=>"foo\n"}, {ERR_SUBST => 's/^$prog: .*/foo/'}],
+
+# Specifying incompatible options should evoke a failure.
+["incompat1", '-in', {EXIT=>2},
+ {ERR=>"$prog: options '-in' are incompatible\n"}],
+["incompat2", '-nR', {EXIT=>2},
+ {ERR=>"$prog: options '-nR' are incompatible\n"}],
+["incompat3", '-dfgiMnR', {EXIT=>2},
+ {ERR=>"$prog: options '-dfgMnR' are incompatible\n"}],
+["incompat4", qw(-c -o /dev/null), {EXIT=>2},
+ {ERR=>"$prog: options '-co' are incompatible\n"}],
+["incompat5", qw(-C -o /dev/null), {EXIT=>2},
+ {ERR=>"$prog: options '-Co' are incompatible\n"}],
+["incompat6", '-cC', {EXIT=>2},
+ {ERR=>"$prog: options '-cC' are incompatible\n"}],
+["incompat7", qw(--sort=random -n), {EXIT=>2},
+ {ERR=>"$prog: options '-nR' are incompatible\n"}],
+
+# -t '\0' is accepted, as of coreutils-5.0.91
+['nul-tab', "-k2,2 -t '\\0'",
+ {IN=>"a\0z\01\nb\0y\02\n"}, {OUT=>"b\0y\02\na\0z\01\n"}],
+
+# fields > SIZE_MAX are silently interpreted as SIZE_MAX
+["bigfield1", "-k $limits->{UINTMAX_OFLOW}",
+ {IN=>"2\n1\n"}, {OUT=>"1\n2\n"}],
+["bigfield2", "-k $limits->{SIZE_OFLOW}",
+ {IN=>"2\n1\n"}, {OUT=>"1\n2\n"}],
+
+# Using an old-style key-specifying option like +1 with an invalid
+# ordering-option character would cause sort to try to free an invalid
+# (non-malloc'd) pointer. This bug affects coreutils-6.5 through 6.9.
+['obs-inval', '+1x', {EXIT=>2},
+ {ERR=>"foo\n"}, {ERR_SUBST => 's/^$prog: .*/foo/'}],
+
+# Exercise the code that enlarges the line buffer. See the thread here:
+# http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/11006
+['realloc-buf', '-S1', {IN=>'a'x4000 ."\n"}, {OUT=>'a'x4000 ."\n"}],
+['realloc-buf-2', '-S1', {IN=>'a'x5 ."\n"}, {OUT=>'a'x5 ."\n"}],
+
+["sort-numeric", '--sort=numeric', {IN=>".01\n0\n"}, {OUT=>"0\n.01\n"}],
+["sort-gennum", '--sort=general-numeric',
+ {IN=>"1e2\n2e1\n"}, {OUT=>"2e1\n1e2\n"}],
+
+# -m with output file also used as an input file
+# In coreutils-7.2, this caused a segfault.
+# This test looks a little strange. Here's why:
+# since we're using "-o f", standard output will be empty, hence OUT=>''
+# We still want to ensure that the output file, "f" has expected contents,
+# hence the added CMP=> directive.
+["output-is-input", '-m -o f', {IN=> {f=> "a\n"}}, {OUT=>''},
+ {CMP=> ["a\n", {'f'=> undef}]} ],
+["output-is-input-2", '-m -o f', {OUT=>''},
+ {IN=> {f=> "a\n"}}, {IN=> {g=> "b\n"}}, {IN=> {h=> "c\n"}},
+ {CMP=> ["a\nb\nc\n", {'f'=> undef}]} ],
+["output-is-input-3", '-m -o f', {OUT=>''},
+ {IN=> {g=> "a\n"}}, {IN=> {h=> "b\n"}}, {IN=> {f=> "c\n"}},
+ {CMP=> ["a\nb\nc\n", {'f'=> undef}]} ],
+
+# --zero-terminated
+['zero-1', '-z', {IN=>"2\0001\000"}, {OUT=>"1\0002\000"}],
+['zero-2', '-z -k2,2', {IN=>"1\n2\0002\n1\000"}, {OUT=>"2\n1\0001\n2\000"}],
+['zero-3', '-zb -k2,2', {IN=>"1\n\n2\0002\n1\0"}, {OUT=>"2\n1\0001\n\n2\0"}],
+);
+
+# Add _POSIX2_VERSION=199209 to the environment of each test
+# that uses an old-style option like +1.
+foreach my $t (@Tests)
+ {
+ foreach my $e (@$t)
+ {
+ !ref $e && $e =~ /\+\d/
+ and push (@$t, {ENV=>'_POSIX2_VERSION=199209'}), last;
+ }
+ }
+
+@Tests = triple_test \@Tests;
+
+# Remember that triple_test creates from each test with exactly one "IN"
+# file two more tests (.p and .r suffix on name) corresponding to reading
+# input from a file and from a pipe. The pipe-reading test would fail
+# due to a race condition about 1 in 20 times.
+# Remove the IN_PIPE version of the "output-is-input" test above.
+# The others aren't susceptible because they have three inputs each.
+@Tests = grep {$_->[0] ne 'output-is-input.p'} @Tests;
+
+my $save_temps = $ENV{DEBUG};
+my $verbose = $ENV{VERBOSE};
+
+my $fail = run_tests ($prog, $prog, \@Tests, $save_temps, $verbose);
+exit $fail;