summaryrefslogtreecommitdiff
path: root/tests/misc/shuf
blob: 6adaae37f5ced34acd398b366d9a46b6872db0f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
#!/bin/sh
# Ensure that shuf randomizes its input.

# Copyright (C) 2006-2010 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/>.

if test "$VERBOSE" = yes; then
  set -x
  shuf --version
fi

. $srcdir/test-lib.sh

seq 100 > in || framework_failure

shuf in >out || fail=1

# Fail if the input is the same as the output.
# This is a probabilistic test :-)
# However, the odds of failure are very low: 1 in 100! (~ 1 in 10^158)
compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }

# Fail if the sorted output is not the same as the input.
sort -n out > out1
compare in out1 || { fail=1; echo "not a permutation" 1>&2; }

# Exercise shuf's -i option.
shuf -i 1-100 > out || fail=1
compare in out > /dev/null && { fail=1; echo "not random?" 1>&2; }
sort -n out > out1
compare in out1 || { fail=1; echo "not a permutation" 1>&2; }

# Exercise shuf's -e option.
t=`shuf -e a b c d e | sort | fmt`
test "$t" = 'a b c d e' || { fail=1; echo "not a permutation" 1>&2; }

# Before coreutils-6.3, this would infloop.
# "seq 1860" produces 8193 (8K + 1) bytes of output.
seq 1860 | shuf > /dev/null || fail=1

# coreutils-6.12 and earlier would output a newline terminator, not \0.
shuf --zero-terminated -i 1-1 > out || fail=1
printf '1\0' > exp || framework_failure
cmp out exp || { fail=1; echo "missing NUL terminator?" 1>&2; }

Exit $fail