Bash Scripting: How to exclude folders from for-loop?

Question

linux

The question is as follows: how to exclude directories from for-loop.
For example, there is this script:

for x in *
do
sha1sum $x
done

How can I make the loop skip directories by and not try to apply hashing to them?

Answer 1

for x in *
do
if [ -f $x ]; then
sha1sum $x
fi
done