Improve 2020/yang/try.sh

The make clobber now removes decoded, code.c and encoded.c which try.sh
creates.

2020/yang/Makefile

@@ -208,7 +208,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
-	${RM} -rf *.dSYM
+	${RM} -rf *.dSYM decoded code.c encoded.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \

2020/yang/try.sh

@@ -15,6 +15,9 @@ make CC="$CC" all >/dev/null || exit 1
 # clear screen after compilation so that only the entry is shown
 clear
 
+# remove code we generate and compile
+rm -f decoded code.c encoded.c
+
 # we will use hexdump later if it's installed
 HEXDUMP="$(type -P hexdump)"
 
@@ -31,57 +34,62 @@ echo 1>&2
 
 read -r -n 1 -p "Press any key to show code.c (space = next page, q = quit): "
 echo 1>&2
-less -rEXF code.c
+less -rEXFK code.c
 echo 1>&2
 
 # compile without a PIN
-echo "Trying to compile without a PIN:"
+read -r -n 1 -p "Press any key to compile without a PIN ($CC code.c -o decode): "
 echo 1>&2
-echo "$ cc code.c -o decode" 1>&2
-cc code.c -o decode
+"$CC" code.c -o decode
 echo 1>&2
 echo "As you can see, you must compile with -DPIN=<number>" 1>&2
 
+# if hexdump is installed we will use hexdump on the wrong code compiled
 if [[ -n "$HEXDUMP" ]]; then
-    # compile with the wrong pin if hexdump is installed
     echo 1>&2
-    echo "Compiling with wrong PIN: cc -DPIN=555 code.c -o wrongcoded" 1>&2
-    cc -DPIN=555 code.c -o wrongcoded	 # wait for it ...
-    read -r -n 1 -p "Press any key to run wrongcoded: "
+    echo "Press any key to compile with wrong PIN 555 ($CC -DPIN=555 code.c -o wrongcoded): " 1>&2
+    "$CC" -DPIN=555 code.c -o wrongcoded	 # wait for it ...
+    read -r -n 1 -p "Press any key to run ./wrongcoded | $HEXDUMP -C: "
     echo 1>&2
     ./wrongcoded | "$HEXDUMP" -C
+else
+    echo 1>&2
+    echo "Press any key to compile with wrong PIN 555 ($CC -DPIN=555 code.c -o wrongcoded): " 1>&2
+    "$CC" -DPIN=555 code.c -o wrongcoded	 # wait for it ...
+    read -r -n 1 -p "Press any key to run ./wrongcoded: "
+    echo 1>&2
+    ./wrongcoded
 fi
 
-read -r -n 1 -p "Press any key to compile with a good PIN: "
 echo 1>&2
 # compile with a PIN
-echo "$ cc -DPIN=23209 code.c -o decoded" 1>&2
-cc -DPIN=23209 code.c -o decoded
+read -r -n 1 -p "Press any key to compile with good PIN 23209 ($CC -DPIN=23209 code.c -o decoded): "
+echo 1>&2
+"$CC" -DPIN=23209 code.c -o decoded
 read -r -n 1 -p "Press any key to run: ./decoded: "
 echo 1>&2
 ./decoded
 
 
-read -r -n 1 -p "Press any key to continue: "
 echo 1>&2
-echo "$ echo \"Hello, world!\" | ./prog 56789 > encoded.c" 1>&2
+read -r -n 1 -p "Press any key to run: echo \"Hello, world!\" | ./prog 56789 > encoded.c: "
+echo 1>&2
 echo "Hello, world!" | ./prog 56789 > encoded.c
 echo 1>&2
 
 read -r -n 1 -p "Press any key to show encoded.c (space = next page, q = quit): "
 echo 1>&2
-less -rEXF encoded.c
+less -rEXFK encoded.c
 echo 1>&2
 
-read -r -n 1 -p "Press any key to compile with PIN 56789: "
+read -r -n 1 -p "Press any key to compile with good PIN 56789 ($CC -DPIN=56789 encoded.c -o decoded): "
 echo 1>&2
-echo "$ cc -DPIN=56789 encoded.c -o decoded" 1>&2
-cc -DPIN=56789 encoded.c -o decoded
+"$CC" -DPIN=56789 encoded.c -o decoded
 echo 1>&2
 
-read -r -n 1 -p "Press any key to run decoded: "
+read -r -n 1 -p "Press any key to run ./decoded: "
 echo 1>&2
-echo "$ ./decoded" 1>&2
 ./decoded
+echo 1>&2
 
 rm -f decoded code.c encoded.c