Added traceback function from http://blog.yjl.im/2012/01/printing-out-call-stack-in-bash.html

cmdarg.sh

@@ -156,6 +156,19 @@ function cmdarg_parse
     fi
 }
 
+function cmdarg_traceback
+{
+    # This code lifted from http://blog.yjl.im/2012/01/printing-out-call-stack-in-bash.html
+    local i=0
+    local FRAMES=${#BASH_LINENO[@]}
+    # FRAMES-2 skips main, the last one in arrays
+    for ((i=FRAMES-2; i>=0; i--)); do
+	echo '  File' \"${BASH_SOURCE[i+1]}\", line ${BASH_LINENO[i]}, in ${FUNCNAME[i+1]}
+	# Grab the source code of the line
+	sed -n "${BASH_LINENO[i]}{s/^/    /;p}" "${BASH_SOURCE[i+1]}"
+    done
+}
+
 if [[ "${_DEFINED_CMDARG}" == "" ]]; then
     export _DEFINED_CMDARG=0
     # Holds the final map of configuration options