do not use unportable sed -i

Author: grayed

tests/test-eq

@@ -6,6 +6,7 @@
 path="/test.txt"
 source="${www}/${path}"
 response="${tmpdir}/response"
+body="${tmpdir}/body"
 difference="${tmpdir}/diff"
 
 cat >$source <<EOF
@@ -26,5 +27,5 @@ run_shellweb
 firstline=$(head -n 1 "$response")
 check="HTTP/1.1 200 OK"
 test x"$firstline" = x"$check" || fail "expected: '$check'; got: '$firstline'"
-sed -i '1,/^$/ d' "$response"
-diff -u "$source" "$response" >$difference || { fail "response didn't match source file"; cat "$difference"; }
+sed '1,/^$/ d' <"$response" >"$body"
+diff -u "$source" "$body" >$difference || { fail "response didn't match source file"; cat "$difference"; }