Checks a website for changes

Usage: diffweb https://domain.tld

diffweb

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+# diffweb - Notify user if a website has changed
+# Usage: diffweb https://domain.tld
+# Author: Justin Oros
+# Revised: 2020 JUNE 25
+
+FILE1=/tmp/file1
+FILE2=/tmp/file2
+
+if [ -z $1 ]
+then
+	echo "Usage: diffweb https://domain.tld"
+	exit 1
+fi
+
+# check to see if file1 exists
+if test -f $FILE1
+then    # if file1 exists
+	# get website data
+	# store to file2
+	curl -s $1 > $FILE2
+else    # if file1 does not exist
+	# notify user of first run
+	echo "diffweb has not run before for $1"
+	# get website data
+	# store to file1
+	curl -s $1 > $FILE1
+fi
+
+# check to see if file2 exists
+if test -f $FILE2
+then
+			# compare files
+			if cmp -s $FILE1 $FILE2
+			then
+						echo "$1 has not changed."
+			else
+						# notify user website has changed
+						echo "$1 has been updated!"
+  					# clone file2 to file1
+						cat $FILE2 > $FILE1
+			fi
+fi