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55 lines
1.7 KiB
Bash
Executable File
55 lines
1.7 KiB
Bash
Executable File
#!/bin/sh
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# Ensure that shuf randomizes its input.
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# Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if test "$VERBOSE" = yes; then
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set -x
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shuf --version
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fi
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. $srcdir/../test-lib.sh
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seq 100 > in || framework_failure
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fail=0
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shuf in >out || fail=1
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# Fail if the input is the same as the output.
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# This is a probabilistic test :-)
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# However, the odds of failure are very low: 1 in 100! (~ 1 in 10^158)
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compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }
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# Fail if the sorted output is not the same as the input.
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sort -n out > out1
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compare in out1 || { fail=1; echo "not a permutation" 1>&2; }
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# Exercise shuf's -i option.
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shuf -i 1-100 > out || fail=1
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compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }
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sort -n out > out1
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compare in out1 || { fail=1; echo "not a permutation" 1>&2; }
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# Exercise shuf's -e option.
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t=`shuf -e a b c d e | sort | fmt`
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test "$t" = 'a b c d e' || { fail=1; echo "not a permutation" 1>&2; }
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# Before coreutils-6.3, this would infloop.
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# "seq 1860" produces 8193 (8K + 1) bytes of output.
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seq 1860 | shuf > /dev/null || fail=1
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(exit $fail); exit $fail
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