diff --git a/t/t7502-commit-porcelain.sh b/t/t7502-commit-porcelain.sh
index ca4a740da0..5733d9cd34 100755
--- a/t/t7502-commit-porcelain.sh
+++ b/t/t7502-commit-porcelain.sh
@@ -16,7 +16,8 @@ commit_msg_is () {
 # Arguments: [<prefix] [<commit message>] [<commit options>]
 check_summary_oneline() {
 	test_tick &&
-	git commit ${3+"$3"} -m "$2" | head -1 > act &&
+	git commit ${3+"$3"} -m "$2" >raw &&
+	head -n 1 raw >act &&
 
 	# branch name
 	SUMMARY_PREFIX="$(git name-rev --name-only HEAD)" &&
@@ -68,7 +69,7 @@ test_expect_success 'output summary format for merges' '
 	git checkout recursive-a &&
 	test_must_fail git merge recursive-b &&
 	# resolve the conflict
-	echo commit-a > file1 &&
+	echo commit-a >file1 &&
 	git add file1 &&
 	check_summary_oneline "" "Merge"
 '
@@ -142,9 +143,11 @@ test_expect_success 'sign off' '
 	>positive &&
 	git add positive &&
 	git commit -s -m "thank you" &&
-	actual=$(git cat-file commit HEAD | sed -ne "s/Signed-off-by: //p") &&
-	expected=$(git var GIT_COMMITTER_IDENT | sed -e "s/>.*/>/") &&
-	test "z$actual" = "z$expected"
+	git cat-file commit HEAD >commit.msg &&
+	sed -ne "s/Signed-off-by: //p" commit.msg >actual &&
+	git var GIT_COMMITTER_IDENT >ident &&
+	sed -e "s/>.*/>/" ident >expected &&
+	test_cmp expected actual
 
 '
 
@@ -153,8 +156,8 @@ test_expect_success 'multiple -m' '
 	>negative &&
 	git add negative &&
 	git commit -m "one" -m "two" -m "three" &&
-	actual=$(git cat-file commit HEAD | sed -e "1,/^\$/d") &&
-	expected=$(echo one; echo; echo two; echo; echo three) &&
+	actual=$(git cat-file commit HEAD >tmp && sed -e "1,/^\$/d" tmp && rm tmp) &&
+	expected=$(test_write_lines "one" "" "two" "" "three") &&
 	test "z$actual" = "z$expected"
 
 '
@@ -163,7 +166,8 @@ test_expect_success 'verbose' '
 
 	echo minus >negative &&
 	git add negative &&
-	git status -v | sed -ne "/^diff --git /p" >actual &&
+	git status -v >raw &&
+	sed -ne "/^diff --git /p" raw >actual &&
 	echo "diff --git a/negative b/negative" >expect &&
 	test_cmp expect actual
 
@@ -189,7 +193,8 @@ test_expect_success 'cleanup commit messages (verbatim option,-t)' '
 
 	echo >>negative &&
 	git commit --cleanup=verbatim --no-status -t expect -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d" >actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 
 '
@@ -198,7 +203,8 @@ test_expect_success 'cleanup commit messages (verbatim option,-F)' '
 
 	echo >>negative &&
 	git commit --cleanup=verbatim -F expect -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 
 '
@@ -207,75 +213,80 @@ test_expect_success 'cleanup commit messages (verbatim option,-m)' '
 
 	echo >>negative &&
 	git commit --cleanup=verbatim -m "$mesg_with_comment_and_newlines" -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 
 '
 
 test_expect_success 'cleanup commit messages (whitespace option,-F)' '
 
 	echo >>negative &&
-	{ echo;echo "# text";echo; } >text &&
+	test_write_lines "" "# text" "" >text &&
 	echo "# text" >expect &&
 	git commit --cleanup=whitespace -F text -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 
 '
 
 test_expect_success 'cleanup commit messages (scissors option,-F,-e)' '
 
 	echo >>negative &&
-	cat >text <<EOF &&
+	cat >text <<-\EOF &&
 
-# to be kept
+	# to be kept
 
-  # ------------------------ >8 ------------------------
-# to be kept, too
-# ------------------------ >8 ------------------------
-to be removed
-# ------------------------ >8 ------------------------
-to be removed, too
-EOF
+	  # ------------------------ >8 ------------------------
+	# to be kept, too
+	# ------------------------ >8 ------------------------
+	to be removed
+	# ------------------------ >8 ------------------------
+	to be removed, too
+	EOF
 
-	cat >expect <<EOF &&
-# to be kept
+	cat >expect <<-\EOF &&
+	# to be kept
 
-  # ------------------------ >8 ------------------------
-# to be kept, too
-EOF
+	  # ------------------------ >8 ------------------------
+	# to be kept, too
+	EOF
 	git commit --cleanup=scissors -e -F text -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'cleanup commit messages (scissors option,-F,-e, scissors on first line)' '
 
 	echo >>negative &&
-	cat >text <<EOF &&
-# ------------------------ >8 ------------------------
-to be removed
-EOF
+	cat >text <<-\EOF &&
+	# ------------------------ >8 ------------------------
+	to be removed
+	EOF
 	git commit --cleanup=scissors -e -F text -a --allow-empty-message &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_must_be_empty actual
 '
 
 test_expect_success 'cleanup commit messages (strip option,-F)' '
 
 	echo >>negative &&
-	{ echo;echo "# text";echo sample;echo; } >text &&
+	test_write_lines "" "# text" "sample" "" >text &&
 	echo sample >expect &&
 	git commit --cleanup=strip -F text -a &&
-	git cat-file -p HEAD |sed -e "1,/^\$/d">actual &&
+	git cat-file -p HEAD >raw &&
+	sed -e "1,/^\$/d" raw >actual &&
 	test_cmp expect actual
 
 '
 
 test_expect_success 'cleanup commit messages (strip option,-F,-e)' '
 
 	echo >>negative &&
-	{ echo;echo sample;echo; } >text &&
+	test_write_lines "" "sample" "" >text &&
 	git commit -e -F text -a &&
 	head -n 4 .git/COMMIT_EDITMSG >actual
 '
@@ -387,7 +398,7 @@ test_expect_success AUTOIDENT 'message shows committer when it is automatic' '
 '
 
 write_script .git/FAKE_EDITOR <<EOF
-echo editor started > "$(pwd)/.git/result"
+echo editor started >"$(pwd)/.git/result"
 exit 0
 EOF
 
@@ -455,7 +466,7 @@ EOF
 test_expect_success EXECKEEPSPID 'a SIGTERM should break locks' '
 	echo >>negative &&
 	! "$SHELL_PATH" -c '\''
-	  echo kill -TERM $$ >> .git/FAKE_EDITOR
+	  echo kill -TERM $$ >>.git/FAKE_EDITOR
 	  GIT_EDITOR=.git/FAKE_EDITOR
 	  export GIT_EDITOR
 	  exec git commit -a'\'' &&
@@ -471,7 +482,8 @@ test_expect_success 'Hand committing of a redundant merge removes dups' '
 	test_must_fail git merge second master &&
 	git checkout master g &&
 	EDITOR=: git commit -a &&
-	git cat-file commit HEAD | sed -n -e "s/^parent //p" -e "/^$/q" >actual &&
+	git cat-file commit HEAD >raw &&
+	sed -n -e "s/^parent //p" -e "/^$/q" raw >actual &&
 	test_cmp expect actual
 
 '
@@ -480,7 +492,8 @@ test_expect_success 'A single-liner subject with a token plus colon is not a foo
 
 	git reset --hard &&
 	git commit -s -m "hello: kitty" --allow-empty &&
-	git cat-file commit HEAD | sed -e "1,/^$/d" >actual &&
+	git cat-file commit HEAD >raw &&
+	sed -e "1,/^$/d" raw >actual &&
 	test_line_count = 3 actual
 
 '
