t/t5538-push-shallow.sh: use the $( ... ) construct for command substitution

diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index 369417498946fcebb901d8593bb584f3767b1e67..0a804dab634d0a72bfabd8826d0cb38e1b4f7dbc 100755 (executable)
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -123,10 +123,10 @@ test_expect_success 'checkout from a bare repo without "add"' '
 test_expect_success 'checkout with grafts' '
        test_when_finished rm .git/info/grafts &&
        test_commit abc &&
-       SHA1=`git rev-parse HEAD` &&
+       SHA1=$(git rev-parse HEAD) &&
        test_commit def &&
        test_commit xyz &&
-       echo "`git rev-parse HEAD` $SHA1" >.git/info/grafts &&
+       echo "$(git rev-parse HEAD) $SHA1" >.git/info/grafts &&
        cat >expected <<-\EOF &&
        xyz
        abc