Add 2020/kurdyukov2/try.sh + format/typo checks

Also made a minor change to makegif.sh to use $0 instead of literal
'makegif.sh' in usage string.

2020/kurdyukov2/try.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2020/kurdyukov2
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+# try finding convert(1) from ImageMagick
+CONVERT="$(type -P convert)"
+
+
+echo "$ (echo P6 1024 1024 255; dd if=/dev/urandom bs=3M count=1) > random.ppm" 1>&2
+(echo P6 1024 1024 255; dd if=/dev/urandom bs=3M count=1) > random.ppm
+echo "Look at random.ppm. Do you see any patterns?" 1>&2
+read -r -n 1 -p "Press any key to continue: "
+echo 1>&2
+# Look at random.ppm. Do you see any patterns?
+echo "$ ./prog_ppm 1000 random.ppm output.ppm" 1>&2
+./prog_ppm 1000 random.ppm output.ppm
+echo 1>&2
+# See which patterns the program has found
+echo "Now open output.ppm. What patterns has the program found?" 1>&2
+echo 1>&2
+read -r -n 1 -p "Press any key to continue: "
+echo 1>&2
+
+echo "$ for i in 0001 0002 0004 0008 0016 0032 0064 0128
+  0256 0512 1024 2048 4096 8192 ; do ./prog $i sample.jpg out$i.jpg; done" 1>&2
+for i in 0001 0002 0004 0008 0016 0032 0064 0128 0256 0512 1024 2048 4096 8192 ; do ./prog "$i" sample.jpg "out$i".jpg; done
+echo "Now flip through out*.jpg and see when you start to recognise the image." 1>&2
+
+if [[ -n "$CONVERT" ]]; then
+    echo 1>&2
+    read -r -n 1 -p "Press any key to create GIF: "
+    echo 1>&2
+    echo "$ $CONVERT -delay 10 -dither none -loop 0 $(ls out*.jpg | sort -V) $(ls out*.jpg | sort -rV) +map out.gif" 1>&2
+    "$CONVERT" -delay 10 -dither none -loop 0 $(ls out*.jpg | sort -V) $(ls out*.jpg | sort -rV) +map out.gif
+    echo 1>&2
+    echo "Now look at out.gif with a viewer that can show animation." 1>&2
+    echo "Warning: includes flashing colours." 1>&2
+fi