Improve 2004/schnitzi/try.sh

It also now checks that vi is installed (for the unlikely case it's not
installed).

2004/schnitzi/try.sh

@@ -15,12 +15,19 @@ make CC="$CC" all >/dev/null || exit 1
 # clear screen after compilation so that only the entry is shown
 clear
 
+# check for vi in the unlikely case it's not installed
+#
+if [[ -z "$(type -P vi)" ]]; then
+    echo "$0: vi not installed, cannot proceed." 1>&2
+    exit 1
+fi
 
-echo "$ ./schnitzi <schnitzi.inp0 | vi -n" 1>&2
+read -r -n 1 -p "Press any key to run: ./schnitzi <schnitzi.inp0 | vi -n: "
+echo 1>&2
 ./schnitzi <schnitzi.inp0 | vi -n
+echo 1>&2
 
-read -r -n 1 -p "Press any key to continue: "
-echo
-
-echo "$ ./schnitzi <schnitzi.inp1 | vi -n" 1>&2
+read -r -n 1 -p "Press any key to run: ./schnitzi <schnitzi.inp1 | vi -n: "
+echo 1>&2
 ./schnitzi <schnitzi.inp1 | vi -n
+echo 1>&2

thanks-for-help.md

@@ -3081,6 +3081,8 @@ He also changed the time factor in the data files as the animations went too
 fast in modern systems, especially the scrolling text of
 [schnitzi.inp1](schnitzi.inp1).
 
+Cody also added the [try.sh](/2004/schnitzi/try.sh) script.
+
 
 ## <a name="2004_sds"></a>[2004/sds](/2004/sds/sds.c) ([README.md](/2004/sds/README.md))