diff -ruN postgresql.orig/src/bin/initdb/initdb.c postgresql/src/bin/initdb/initdb.c

--- postgresql.orig/src/bin/initdb/initdb.c	2017-08-30 23:38:41.176973658 +0800

+++ postgresql/src/bin/initdb/initdb.c	2017-08-30 23:57:54.621654434 +0800

@@ -3260,6 +3260,8 @@

 	appendPQExpBuffer(start_db_cmd, " -l %s start", _("logfile"));

 	printf(_("\nSuccess. You can now start the database server using:\n\n"

+			 "    service postgresql start\n"

+			 "or\n"

 			 "    %s\n\n"),

 		   start_db_cmd->data);