Remove last three characters from all filenames in a directory

I have a directory with about 10 files and I want to remove the last three characters from the names of all of these files. Anyone know a terminal command that can do this?

And separately, how would I change the characters in the names of all these files to lowercase?

Solution 1:

Remove last three characters from all filenames in current directory:

rename 's/...$//' *

Change the characters in the names of all files from current directory to lowercase:

rename 'y/A-Z/a-z/' *

For more info see man rename.

Solution 2:

Remove the last 3 characters:

for i in *
do
j=`echo $i | sed -e 's/...$//'`
mv $i $j
done

Change names to lower case:

for i in *
do
j=`echo $i | tr A-Z a-z`
mv $i $j
done