Linux How to write in a for loop in a straight line code example

Example 1: for loop in bash for files

#!/bin/bash
FILES=/path/to/*
for f in $FILES
do
  echo "Processing $f file..."
  # take action on each file. $f store current file name
  cat $f
done

Example 2: bash script loop

while [ <some test> ]
do
<commands>
done