Add log_macOS.sh

Display log messages from "com.apple.ifdreader" process

Use argument "-d" to change log level from "info" to "debug".

log_macOS.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+# default level
+arg=--info
+
+args=`getopt dbe $*` ; errcode=$?; set -- $args
+
+if [ $errcode != 0 ]
+then
+ echo "Usage: $0 [-d]"
+ echo "-d: debug level (default is info level)"
+ exit 2
+fi
+
+# check the script arguments
+for i
+do
+ case "$i"
+ in
+ -d)
+ arg=--debug
+ break;;
+ esac
+done
+
+log stream --predicate 'process = "com.apple.ifdreader"' $arg