for file in * do
  echo "$file"
done

for file in *; do
  echo "$file"
done

# or 

for file in *
do
  echo "$file"
done

ShellCheck found a do on the same line as a loop, but do only starts a loop block at the start of a line/statement. Make the do the start of a new line/statement by inserting a linefeed or semicolon in front of it.

If you wanted to treat do as a literal string, you can quote it to make this clear to ShellCheck and humans:

for f in "for" "do" "done"
do
  echo "Shell keywords include: $f"
done

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!