Add 1990/theorem/try.sh

This script shows not just theorem but the sorter and the Fibonacci
generator as well. For the sorter it reverses output of ls (redirected
to a file) and then shows how using sorter on it results in the same
output of ls (with no options specified). Of course if different ls
sorts output differently this could fail but I did not think of that
until after I wrote it.

1990/theorem/try.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 1990/theorem
+#
+
+# 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="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+
+
+
+read -r -n 1 -p "Press any key to run: ./theorem y 0 1 0.1 1: "
+echo 1>&2
+./theorem y 0 1 0.1 1
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./theorem x 1 2 0.1 2: "
+echo 1>&2
+./theorem x 1 2 0.1 2
+echo 1>&2
+
+echo "$ ./theorem -r 0 0 0 0 < theorem.c > sorter.c" 1>&2
+./theorem -r 0 0 0 0 < theorem.c > sorter.c
+echo "$ make sorter" 1>&2
+make sorter
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ls | ./sorter > ls.sorted.txt: "
+echo 1>&2
+# SC2012 (info): Use find instead of ls to better handle non-alphanumeric filenames.
+# shellcheck disable=SC2012
+ls | ./sorter > ls.sorted.txt
+
+read -r -n 1 -p "Press any key to run: ls -r > ls.txt: "
+echo 1>&2
+ls -r > ls.txt
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./sorter < ls.txt: "
+echo 1>&2
+./sorter < ls.txt
+echo 1>&2
+
+read -r -n 1 -p "./sorter < ls.txt > ls.sorted.2.txt: "
+echo 1>&2
+./sorter < ls.txt > ls.sorted.2.txt
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show diff between ls.sorted.2.txt and ls.sorted.txt: "
+echo 1>&2
+diff -s ls.sorted.2.txt ls.sorted.txt
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./sorter 0 0 0 0 < theorem.c > fibonacci.c: "
+./sorter 0 0 0 0 < theorem.c > fibonacci.c
+echo "$ make fibonacci" 1>&2
+make fibonacci
+
+read -r -n 1 -p "Press any key to run: ./fibonacci 1 7: "
+echo 1>&2
+./fibonacci 1 7
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./fibonacci 2 5: "
+echo 1>&2
+./fibonacci 2 5
+echo 1>&2