diff --git a/run-command.c b/run-command.c
index 756f1839aa..50f741f2ab 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1526,6 +1526,11 @@ static void pp_init(struct parallel_processes *pp,
 	if (!opts->get_next_task)
 		BUG("you need to specify a get_next_task function");
 
+	if (opts->ungroup) {
+		if (opts->duplicate_output)
+			BUG("duplicate_output and ungroup are incompatible with each other");
+	}
+
 	CALLOC_ARRAY(pp->children, n);
 	if (!opts->ungroup)
 		CALLOC_ARRAY(pp->pfd, n);
@@ -1645,14 +1650,19 @@ static void pp_buffer_stderr(struct parallel_processes *pp,
 	for (size_t i = 0; i < opts->processes; i++) {
 		if (pp->children[i].state == GIT_CP_WORKING &&
 		    pp->pfd[i].revents & (POLLIN | POLLHUP)) {
-			int n = strbuf_read_once(&pp->children[i].err,
-						 pp->children[i].process.err, 0);
+			ssize_t n = strbuf_read_once(&pp->children[i].err,
+						     pp->children[i].process.err, 0);
 			if (n == 0) {
 				close(pp->children[i].process.err);
 				pp->children[i].state = GIT_CP_WAIT_CLEANUP;
-			} else if (n < 0)
+			} else if (n < 0) {
 				if (errno != EAGAIN)
 					die_errno("read");
+			} else if (opts->duplicate_output) {
+				opts->duplicate_output(&pp->children[i].err,
+					pp->children[i].err.len - n,
+					opts->data, pp->children[i].data);
+			}
 		}
 	}
 }
diff --git a/run-command.h b/run-command.h
index 072db56a4d..0c16d7f251 100644
--- a/run-command.h
+++ b/run-command.h
@@ -408,6 +408,25 @@ typedef int (*start_failure_fn)(struct strbuf *out,
 				void *pp_cb,
 				void *pp_task_cb);
 
+/**
+ * This callback is called whenever output from a child process is buffered
+ * 
+ * See run_processes_parallel() below for a discussion of the "struct
+ * strbuf *out" parameter.
+ * 
+ * The offset refers to the number of bytes originally in "out" before
+ * the output from the child process was buffered. Therefore, the buffer
+ * range, "out + buf" to the end of "out", would contain the buffer of
+ * the child process output.
+ *
+ * pp_cb is the callback cookie as passed into run_processes_parallel,
+ * pp_task_cb is the callback cookie as passed into get_next_task_fn.
+ *
+ * This function is incompatible with "ungroup"
+ */
+typedef void (*duplicate_output_fn)(struct strbuf *out, size_t offset,
+				    void *pp_cb, void *pp_task_cb);
+
 /**
  * This callback is called on every child process that finished processing.
  *
@@ -461,6 +480,12 @@ struct run_process_parallel_opts
 	 */
 	start_failure_fn start_failure;
 
+	/**
+	 * duplicate_output: See duplicate_output_fn() above. Unless you need
+	 * to capture output from child processes, leave this as NULL.
+	 */
+	duplicate_output_fn duplicate_output;
+
 	/**
 	 * task_finished: See task_finished_fn() above. This can be
 	 * NULL to omit any special handling.
diff --git a/t/helper/test-run-command.c b/t/helper/test-run-command.c
index 3ecb830f4a..4596ba68a8 100644
--- a/t/helper/test-run-command.c
+++ b/t/helper/test-run-command.c
@@ -52,6 +52,20 @@ static int no_job(struct child_process *cp,
 	return 0;
 }
 
+static void duplicate_output(struct strbuf *out,
+			size_t offset,
+			void *pp_cb UNUSED,
+			void *pp_task_cb UNUSED)
+{
+	struct string_list list = STRING_LIST_INIT_DUP;
+	struct string_list_item *item;
+
+	string_list_split(&list, out->buf + offset, '\n', -1);
+	for_each_string_list_item(item, &list)
+		fprintf(stderr, "duplicate_output: %s\n", item->string);
+	string_list_clear(&list, 0);
+}
+
 static int task_finished(int result,
 			 struct strbuf *err,
 			 void *pp_cb,
@@ -439,6 +453,12 @@ int cmd__run_command(int argc, const char **argv)
 		opts.ungroup = 1;
 	}
 
+	if (!strcmp(argv[1], "--duplicate-output")) {
+		argv += 1;
+		argc -= 1;
+		opts.duplicate_output = duplicate_output;
+	}
+
 	jobs = atoi(argv[2]);
 	strvec_clear(&proc.args);
 	strvec_pushv(&proc.args, (const char **)argv + 3);
diff --git a/t/t0061-run-command.sh b/t/t0061-run-command.sh
index e2411f6a9b..31f1db96fc 100755
--- a/t/t0061-run-command.sh
+++ b/t/t0061-run-command.sh
@@ -135,6 +135,15 @@ test_expect_success 'run_command runs in parallel with more jobs available than
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs in parallel with more jobs available than tasks --duplicate-output' '
+	test-tool run-command --duplicate-output run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_must_be_empty out &&
+	test 4 = $(grep -c "duplicate_output: Hello" err) &&
+	test 4 = $(grep -c "duplicate_output: World" err) &&
+	sed "/duplicate_output/d" err >err1 &&
+	test_cmp expect err1
+'
+
 test_expect_success 'run_command runs ungrouped in parallel with more jobs available than tasks' '
 	test-tool run-command --ungroup run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
 	test_line_count = 8 out &&
@@ -147,6 +156,15 @@ test_expect_success 'run_command runs in parallel with as many jobs as tasks' '
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs in parallel with as many jobs as tasks --duplicate-output' '
+	test-tool run-command --duplicate-output run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_must_be_empty out &&
+	test 4 = $(grep -c "duplicate_output: Hello" err) &&
+	test 4 = $(grep -c "duplicate_output: World" err) &&
+	sed "/duplicate_output/d" err >err1 &&
+	test_cmp expect err1
+'
+
 test_expect_success 'run_command runs ungrouped in parallel with as many jobs as tasks' '
 	test-tool run-command --ungroup run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
 	test_line_count = 8 out &&
@@ -159,6 +177,15 @@ test_expect_success 'run_command runs in parallel with more tasks than jobs avai
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs in parallel with more tasks than jobs available --duplicate-output' '
+	test-tool run-command --duplicate-output run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_must_be_empty out &&
+	test 4 = $(grep -c "duplicate_output: Hello" err) &&
+	test 4 = $(grep -c "duplicate_output: World" err) &&
+	sed "/duplicate_output/d" err >err1 &&
+	test_cmp expect err1
+'
+
 test_expect_success 'run_command runs ungrouped in parallel with more tasks than jobs available' '
 	test-tool run-command --ungroup run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
 	test_line_count = 8 out &&
@@ -180,6 +207,12 @@ test_expect_success 'run_command is asked to abort gracefully' '
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command is asked to abort gracefully --duplicate-output' '
+	test-tool run-command --duplicate-output run-command-abort 3 false >out 2>err &&
+	test_must_be_empty out &&
+	test_cmp expect err
+'
+
 test_expect_success 'run_command is asked to abort gracefully (ungroup)' '
 	test-tool run-command --ungroup run-command-abort 3 false >out 2>err &&
 	test_must_be_empty out &&
@@ -196,6 +229,12 @@ test_expect_success 'run_command outputs ' '
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command outputs --duplicate-output' '
+	test-tool run-command --duplicate-output run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_must_be_empty out &&
+	test_cmp expect err
+'
+
 test_expect_success 'run_command outputs (ungroup) ' '
 	test-tool run-command --ungroup run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
 	test_must_be_empty out &&
