chmod +x 1986/applin/applin.c

The program works as a shell script too so rather than having to do

    sh applin.c

one can do

    ./applin.c

though of course they could also do

    sh applin.c

if they wanted to.

Since the 'to use' shows './applin' the 'try' no longer shows it.
Instead it just shows './applin.c'.

1986/applin/README.md

@@ -15,9 +15,7 @@ make all
 ### Try:
 
 ```sh
-sh applin.c
-
-./applin
+./applin.c
 ```