Implement redirection of output from NSH builtin commands to a file in a mounted volume

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5521 42af7a65-404d-4744-a932-0658087f49c3

configs/sim/nsh/defconfig

@@ -73,7 +73,7 @@ CONFIG_SCHED_WORKPRIORITY=192
 CONFIG_SCHED_WORKPERIOD=50000
 CONFIG_SCHED_WORKSTACKSIZE=1024
 CONFIG_SIG_SIGWORK=17
-CONFIG_SCHED_WAITPID=n
+CONFIG_SCHED_WAITPID=y
 CONFIG_SCHED_ATEXIT=n
 CONFIG_SCHED_ONEXIT=n
 
@@ -224,6 +224,7 @@ CONFIG_EXAMPLES_OSTEST_STACKSIZE=8192
 #
 # Settings for apps/nshlib
 #
+CONFIG_NSH_BUILTIN_APPS=n
 CONFIG_NSH_FILEIOSIZE=1024
 CONFIG_NSH_STRERROR=n
 CONFIG_NSH_LINELEN=80

configs/vsn/src/README.txt

@@ -12,8 +12,7 @@ Execution starts in the following order:
    is set. It must be set for the VSN board.
    
  - boot, performs initial chip and board initialization
- - sched/os_bringup.c then calls either user_start or exec_builtin()
-   with application as set in the .config
+ - sched/os_bringup.c then calls user entry defined in the .config file.
 
 
 Naming throughout the code