update help text for -N

With -N, just parse arguments and ignore the file.

Change readme2index.sh version from "0.1 2023-12-10"
to "0.2 2023-12-29".  The previous change in
commit d5c4171d73
forgot to update the version number.

inc/md2html.cfg

@@ -48,7 +48,7 @@
 #	-V		print version string and exit
 #
 #	-n		go thru the actions, but do not update any files (def: do the action)
-#	-N		do not process file, just ignore the file (def: process the file)
+#	-N		do not process file, just parse arguments and ignore the file (def: process the file)
 #
 #	-d topdir	set topdir (def: if 'git rev-parse --is-inside-work-tree' is true, then
 #					 topdir is output of 'git rev-parse --show-toplevel')

tmp/readme2index.sh

@@ -26,17 +26,19 @@
 #
 # Share and enjoy! :-)
 
-# firewall - bash must be version 4.2 or later
+# firewall - must be bash with a version 4.2 or later
 #
 # We must declare arrays with -ag or -Ag
 #
-if [[ ${BASH_VERSINFO[0]} -lt 4 || ${BASH_VERSINFO[0]} -eq 4 && ${BASH_VERSINFO[1]} -lt 2 ]]; then
+if [[ -z ${BASH_VERSINFO[0]} || ${BASH_VERSINFO[0]} -lt 4 || ${BASH_VERSINFO[0]} -eq 4 && ${BASH_VERSINFO[1]} -lt 2 ]]; then
     echo "$0: ERROR: bash version must be >= 4.2: $BASH_VERSION" 1>&2
     exit 4
 fi
 
 # setup bash file matching
 #
+# Requires bash with a version 4.2 or later
+#
 shopt -s nullglob	# enable expanded to nothing rather than remaining unexpanded
 shopt -u failglob	# disable error message if no matches are found
 shopt -u dotglob	# disable matching files starting with .
@@ -47,6 +49,8 @@ shopt -s globstar	# enable ** to match all files and zero or more directories an
 
 # other required bash options
 #
+# Requires bash with a version 4.2 or later
+#
 shopt -s lastpipe	# run last command of a pipeline not executed in the background in the current shell environment
 
 # set usage message
@@ -62,7 +66,7 @@ export USAGE="usage: $0 [-h] [-v level] [-V] [-n] [-N]
 	-V		print version string and exit
 
 	-n		go thru the actions, but do not update any files (def: do the action)
-	-N		do not process file, just ignore the file (def: process the file)
+	-N		do not process file, just parse arguments and ignore the file (def: process the file)
 
 	-d topdir	set topdir (def: if 'git rev-parse --is-inside-work-tree' is true, then
 					 topdir is output of 'git rev-parse --show-toplevel')
@@ -132,7 +136,7 @@ function global_variable_setup
 
     # setup
     #
-    export VERSION="0.1 2023-12-10"
+    export VERSION="0.2 2023-12-29"
     NAME=$(basename "$0")
     export NAME
     #