Fix 2005/mikeash/try.sh (shellcheck and otherwise)

2005/mikeash/try.sh

@@ -18,21 +18,19 @@ clear
 
 read -r -n 1 -p "Press any key to run: ./mikeash < mikeash.c (space = next page, q = quit): "
 echo 1>&2
-./mikeash < mikeash.c
+./mikeash < mikeash.c | less -rEXFK
 echo 1>&2
 
 echo 1>&2
-echo "The next command should print nothing." 1>&2
-read -r -n 1 -p "Press any key to run: ./mikeash < mikeash.c | diff - mikeash.c: "
+read -r -n 1 -p "Press any key to run: ./mikeash < mikeash.c | diff -s - mikeash.c: "
 echo 1>&2
-# ShellCheck is incorrect here:
-#
-#   SC2094 (info): Make sure not to read and write the same file in the same pipeline.
-#
-# so we disable it.
+
+# We're not reading and writing to the same file at all.
 #
+# SC2094 (info): Make sure not to read and write the same file in the same pipeline.
+# https://www.shellcheck.net/wiki/SC2094
 # shellcheck disable=SC2094
-./mikeash < mikeash.c | diff - mikeash.c
+./mikeash < mikeash.c | diff -s - mikeash.c
 echo 1>&2
 
 echo "For the next two commands we will add a newline after the command's output" 1>&2
@@ -45,15 +43,7 @@ echo '(format t "~s" (+ 2 2 ))' | ./mikeash
 echo 1>&2
 
 echo "The next command will evaluate the expression: (2+2) * (5 - 9/3), giving 8\"." 1>&2
-
-# ShellCheck warns:
-#
-#   SC2140 (warning): Word is of the form "A"B"C" (B indicated). Did you mean "ABC" or "A\"B\"C"?
-#
-# ShellCheck is wrong.
-#
-# shellcheck disable=SC2140
-read -r -n 1 -p "Press any key to run: echo '(format t "~s" (* (+ 2 2 ) (- 5 (/ 9 3 ))))' | ./mikeash: "
+read -r -n 1 -p "Press any key to run: echo '(format t \"~s\" (* (+ 2 2 ) (- 5 (/ 9 3 ))))' | ./mikeash: "
 echo 1>&2
 echo '(format t "~s" (* (+ 2 2 ) (- 5 (/ 9 3 ))))' | ./mikeash
 echo 1>&2