1#!/bin/sh
2# exercise tail -c
3
4# Copyright 2014-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ tail
21
22# Make sure it works on funny files in /proc and /sys.
23for file in /proc/version /sys/kernel/profiling; do
24  if test -r $file; then
25    cp -f $file copy &&
26    tail -c -1 copy > exp || framework_failure_
27
28    tail -c -1 $file > out || fail=1
29    compare exp out || fail=1
30  fi
31done
32
33# Make sure it works for pipes
34printf '123456' | tail -c3 > out || fail=1
35printf '456' > exp || framework_failure_
36compare exp out || fail=1
37
38Exit $fail
39