diff --git a/usr.bin/du/tests/du_test.sh b/usr.bin/du/tests/du_test.sh
index 395051a0d781..4a8f11e83ff5 100755
--- a/usr.bin/du/tests/du_test.sh
+++ b/usr.bin/du/tests/du_test.sh
@@ -1,167 +1,168 @@
 #
 # Copyright (c) 2017 Enji Cooper <ngie@FreeBSD.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 #
 # $FreeBSD$
 
 atf_test_case A_flag
 A_flag_head()
 {
 	atf_set "descr" "Verify -A behavior"
 }
 A_flag_body()
 {
 	# XXX: compressed volumes?
 	atf_check truncate -s 10g sparse.file
 	atf_check -o inline:'1\tsparse.file\n' du -g sparse.file
 	atf_check -o inline:'10\tsparse.file\n' du -A -g sparse.file
 }
 
 atf_test_case H_flag
 H_flag_head()
 {
 	atf_set "descr" "Verify -H behavior"
 }
 H_flag_body()
 {
 	local paths1='testdir/A/B testdir/A testdir/C testdir'
 	local paths2='testdir/A/B testdir/A testdir/C testdir'
-	local sep='\n[0-9]+\t'
+	local lineprefix="^[0-9]+$(printf "\t")"
+	local sep="\n${lineprefix}"
 
 	atf_check mkdir testdir
 	atf_check -x "cd testdir && mkdir A && touch A/B && ln -s A C"
 
 	atf_check -o save:du.out du -aAH testdir
-	atf_check egrep -q "[0-9]+\t$(echo $paths1 | tr ' ' "$sep")\n" du.out
+	atf_check egrep -q "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")" du.out
 	atf_check -o save:du_C.out du -aAH testdir/C
-	atf_check egrep -q "[0-9]+\t$(echo $paths2 | tr ' ' "$sep")\n" du_C.out
+	atf_check egrep -q "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")" du_C.out
 }
 
 atf_test_case I_flag
 I_flag_head()
 {
 	atf_set "descr" "Verify -I behavior"
 }
 I_flag_body()
 {
 	paths_sans_foo_named="a/motley/fool/of/sorts fool/parts/with/their/cache bar baz"
 	paths_foo_named="foo foobar"
 	paths="$paths_sans_foo_named $paths_foo_named"
 
 	# cd'ing to testdir helps ensure that files from atf/kyua don't
 	# pollute the results.
 	atf_check -x "mkdir testdir && cd testdir && mkdir -p $paths"
 	atf_check -o save:du.out -x "cd testdir && du -s $paths_sans_foo_named"
 	atf_check -o save:du_I.out -x "cd testdir && du -I '*foo*' -s $paths"
 
 	atf_check diff -u du.out du_I.out
 }
 
 atf_test_case c_flag
 c_flag_head()
 {
 	atf_set	"descr" "Verify -c output"
 }
 c_flag_body()
 {
 	atf_check truncate -s 0 foo bar
 }
 
 atf_test_case g_flag
 g_flag_head()
 {
 	atf_set "descr" "Verify -g output"
 }
 g_flag_body()
 {
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
 	atf_check truncate -s 1t D
 	atf_check -o inline:'1\tA\n1\tB\n1\tC\n1024\tD\n' du -Ag A B C D
 }
 
 atf_test_case h_flag
 h_flag_head()
 {
 	atf_set	"descr" "Verify -h output"
 }
 h_flag_body()
 {
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
 	atf_check truncate -s 1t D
 	atf_check -o inline:'1.0K\tA\n1.0M\tB\n1.0G\tC\n1.0T\tD\n' du -Ah A B C D
 }
 
 atf_test_case k_flag
 k_flag_head()
 {
 	atf_set "descr" "Verify -k output"
 }
 k_flag_body()
 {
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check -o inline:'1\tA\n1024\tB\n' du -Ak A B
 }
 
 atf_test_case m_flag
 m_flag_head()
 {
 	atf_set "descr" "Verify -m output"
 }
 m_flag_body()
 {
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
 	atf_check -o inline:'1\tA\n1\tB\n1024\tC\n' du -Am A B C
 }
 
 atf_test_case si_flag
 si_flag_head()
 {
 	atf_set "descr" "Verify --si output"
 }
 si_flag_body()
 {
 	atf_check truncate -s 1500000 A
 	atf_check truncate -s 1572864 B
 
 	atf_check -o inline:'1.4M\tA\n1.5M\tB\n' du -Ah A B
 	atf_check -o inline:'1.5M\tA\n1.6M\tB\n' du -A --si A B
 }
 
 atf_init_test_cases()
 {
 	atf_add_test_case A_flag
 	atf_add_test_case H_flag
 	atf_add_test_case I_flag
 	atf_add_test_case g_flag
 	atf_add_test_case h_flag
 	atf_add_test_case k_flag
 	atf_add_test_case m_flag
 	atf_add_test_case si_flag
 }