(Shell script) variables inside loop get reset.

Issue

• Running the following code:

files=0
directories=0
other=0
ls -A /some/directory | while read entry
do
   [ -f $entry ] && files=$((files+1)) && continue
   [ -d $entry ] && $=$((directories+1)) && continue
   other=$((other+1))
done
echo Files = $files.
echo Directories = $directories.
echo Other = $other

always results in:

Files = 0.
Directories = 0.
Other = 0.

no matter which direcory is used in place of "/some/directory" in the above example.