How to remove first dot from a list of file paths

Question

I need to calculate the md5sum of one string per line in my ls dump:

directory_listing.txt:

./r/g4/f1.JPG
./r/g4/f2.JPG
./r/g4/f3.JPG
./r/g4/f4.JPG

However the md5sum should be calculated without the 'first dot'. I've written a simple script so far:

while read line
do
echo $line | exec 'md5sum'
done

./g.sh < directory_listing.txt

How can I remove the first dot from each line?

Answer 1

$ foo=./abc/123
$ echo "${foo#./}"
abc/123

Answer 2

Change:

echo $line | exec 'md5sum'

to:

echo $line | cut -c 2- | exec 'md5sum'