diff --git a/examples/README.txt b/examples/README.txt
index 3b09768d50..07a3f9d543 100644
--- a/examples/README.txt
+++ b/examples/README.txt
@@ -57,14 +57,17 @@ examples/nsh
   Other behavior of NSH can be modified with the following settings in
   the configs/<board-name>/defconfig file:
 
-  * CONFIG_NSH_IOBUFFERSIZE
+  * CONFIG_EXAMPLES_NSH_FILEIOSIZE
       Size of a static I/O buffer used for file access (ignored if
       there is no filesystem).
 
-  * CONFIG_NSH_STRERROR
+  * CONFIG_EXAMPLES_NSH_STRERROR
       strerror(errno) makes more readable output but strerror() is
       very large and will not be used unless this setting is 'y'
 
+  * CONFIG_EXAMPLES_NSH_LINELEN
+      The maximum length of one command line.  Default: 80
+
   * CONFIG_EXAMPLES_NSH_TELNET
       By default, NSH is configured to use the serial console.
       If CONFIG_EXAMPLES_NSH_TELNET is set to 'y', then a TELENET
diff --git a/examples/nsh/nsh.h b/examples/nsh/nsh.h
index 3a8948b2a6..a4b9c41602 100644
--- a/examples/nsh/nsh.h
+++ b/examples/nsh/nsh.h
@@ -55,15 +55,21 @@
 #define NSH_MAX_ARGUMENTS 6
 
 /* strerror() produces much nicer output but is, however, quite large and
- * will only be used if CONFIG_NSH_STRERROR is defined.
+ * will only be used if CONFIG_EXAMPLES_NSH_STRERROR is defined.
  */
 
-#ifdef CONFIG_NSH_STRERROR
+#ifdef CONFIG_EXAMPLES_NSH_STRERROR
 #  define NSH_ERRNO strerror(errno)
 #else
 #  define NSH_ERRNO errno
 #endif
 
+/* Maximum size of one command line (telnet or serial) */
+
+#ifndef CONFIG_EXAMPLES_NSH_LINELEN
+#  define CONFIG_EXAMPLES_NSH_LINELEN 80
+#endif
+
 /* The following two settings are used only in the telnetd interface */
 
 #ifndef CONFIG_EXAMPLES_NSH_IOBUFFER_SIZE
@@ -85,10 +91,7 @@
 /* Define to enable dumping of all input/output buffers */
 
 #undef CONFIG_EXAMPLES_NSH_TELNETD_DUMPBUFFER
-
-/* Sizing */
-
-#define NSH_MAX_LINELEN 80
+#undef CONFIG_EXAMPLES_NSH_FULLPATH
 
 /****************************************************************************
  * Public Types
diff --git a/examples/nsh/nsh_fscmds.c b/examples/nsh/nsh_fscmds.c
index 45426604f1..2cfb240982 100644
--- a/examples/nsh/nsh_fscmds.c
+++ b/examples/nsh/nsh_fscmds.c
@@ -76,14 +76,14 @@
  */
 
 #if CONFIG_NFILE_DESCRIPTORS > 0
-#  ifdef CONFIG_NSH_IOBUFFERSIZE
-#    if CONFIG_NSH_IOBUFFERSIZE > (PATH_MAX + 1)
-#      define IOBUFFERSIZE CONFIG_NSH_IOBUFFERSIZE
+#  ifdef CONFIG_EXAMPLES_NSH_FILEIOSIZE
+#    if CONFIG_EXAMPLES_NSH_FILEIOSIZE > (PATH_MAX + 1)
+#      define IOBUFFERSIZE CONFIG_EXAMPLES_NSH_FILEIOSIZE
 #    else
 #      define IOBUFFERSIZE (PATH_MAX + 1)
 #    endif
 #  else
-#    define IOBUFFERSIZE      1024
+#    define IOBUFFERSIZE 1024
 #  endif
 # else
 #    define IOBUFFERSIZE (PATH_MAX + 1)
@@ -103,6 +103,12 @@ typedef int (*direntry_handler_t)(FAR void *, const char *, struct dirent *, voi
  * Private Data
  ****************************************************************************/
 
+/* Common buffer for file I/O.  Note the use of this common buffer precludes
+ * multiple copies of NSH running concurrently.  It should be allocated per
+ * NSH instance and retained in the "handle" as is done for the telnet
+ * connection.
+ */
+
 static char g_iobuffer[IOBUFFERSIZE];
 
 /****************************************************************************
@@ -163,7 +169,7 @@ static int foreach_direntry(FAR void *handle, const char *cmd, const char *dirpa
 
   /* Trim trailing '/' from directory names */
 
-#ifdef CONFIG_FULL_PATH
+#ifdef CONFIG_EXAMPLES_NSH_FULLPATH
   trim_dir(arg);
 #endif
 
@@ -306,7 +312,7 @@ static int ls_handler(FAR void *handle, const char *dirpath, struct dirent *entr
 
   /* then provide the filename that is common to normal and verbose output */
 
-#ifdef CONFIG_FULL_PATH
+#ifdef CONFIG_EXAMPLES_NSH_FULLPATH
   nsh_output(handle, " %s/%s", arg, entryp->d_name);
 #else
   nsh_output(handle, " %s", entryp->d_name);
@@ -365,7 +371,7 @@ static int ls_recursive(FAR void *handle, const char *dirpath, struct dirent *en
 #if CONFIG_NFILE_DESCRIPTORS > 0
 void cmd_cat(FAR void *handle, int argc, char **argv)
 {
-  char buffer[1024];
+  char buffer[IOBUFFERSIZE];
 
   /* Open the file for reading */
 
@@ -380,7 +386,7 @@ void cmd_cat(FAR void *handle, int argc, char **argv)
 
   for (;;)
     {
-      int nbytesread = read(fd, buffer, 1024);
+      int nbytesread = read(fd, buffer, IOBUFFERSIZE);
 
       /* Check for read errors */
 
diff --git a/examples/nsh/nsh_main.c b/examples/nsh/nsh_main.c
index b240df2e1d..4f6b624542 100644
--- a/examples/nsh/nsh_main.c
+++ b/examples/nsh/nsh_main.c
@@ -52,9 +52,6 @@
  * Definitions
  ****************************************************************************/
 
-#define CONFIG_NSH_LINE_SIZE 80
-#undef  CONFIG_FULL_PATH
-
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -147,7 +144,7 @@ const char g_fmtcmdnotfound[]    = "nsh: %s: command not found\n";
 const char g_fmtcmdnotimpl[]     = "nsh: %s: command not implemented\n";
 const char g_fmtnosuch[]         = "nsh: %s: no such %s: %s\n";
 const char g_fmttoomanyargs[]    = "nsh: %s: too many arguments\n";
-#ifdef CONFIG_NSH_STRERROR
+#ifdef CONFIG_EXAMPLES_NSH_STRERROR
 const char g_fmtcmdfailed[]      = "nsh: %s: %s failed: %s\n";
 #else
 const char g_fmtcmdfailed[]      = "nsh: %s: %s failed: %d\n";
diff --git a/examples/nsh/nsh_serial.c b/examples/nsh/nsh_serial.c
index 7716521abd..ad8ccad178 100644
--- a/examples/nsh/nsh_serial.c
+++ b/examples/nsh/nsh_serial.c
@@ -50,9 +50,6 @@
  * Definitions
  ****************************************************************************/
 
-#define CONFIG_NSH_LINE_SIZE 80
-#undef  CONFIG_FULL_PATH
-
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -74,7 +71,7 @@ struct cmdmap_s
  * Private Data
  ****************************************************************************/
 
-static char line[CONFIG_NSH_LINE_SIZE];
+static char line[CONFIG_EXAMPLES_NSH_LINELEN];
 
 /****************************************************************************
  * Public Data
@@ -106,7 +103,7 @@ int nsh_serialmain(void)
 
       /* Get the next line of input */
 
-      fgets(line, CONFIG_NSH_LINE_SIZE, stdin);
+      fgets(line, CONFIG_EXAMPLES_NSH_LINELEN, stdin);
 
       /* Parse process the command */
 
diff --git a/examples/nsh/nsh_telnetd.c b/examples/nsh/nsh_telnetd.c
index 089a27faf9..872390d5f8 100644
--- a/examples/nsh/nsh_telnetd.c
+++ b/examples/nsh/nsh_telnetd.c
@@ -511,7 +511,7 @@ int nsh_telnetout(FAR void *handle, const char *fmt, ...)
   va_list ap;
 
   /* Put the new info into the buffer.  Here we are counting on the fact that
-   * no output strings will exceed NSH_MAX_LINELEN!
+   * no output strings will exceed CONFIG_EXAMPLES_NSH_LINELEN!
    */
 
   va_start(ap, fmt);
@@ -542,7 +542,7 @@ int nsh_telnetout(FAR void *handle, const char *fmt, ...)
    * maximum length string.
    */
 
-  if (nbytes > CONFIG_EXAMPLES_NSH_IOBUFFER_SIZE - NSH_MAX_LINELEN)
+  if (nbytes > CONFIG_EXAMPLES_NSH_IOBUFFER_SIZE - CONFIG_EXAMPLES_NSH_LINELEN)
     {
       nsh_flush(pstate);
     }