Copy Set of Files to All Users Home Directory

First grab all user names from /etc/passwd:
cut -d: -f1 /etc/passwd

Next use a loop to apply copy and set the correct permissions on the file.

Finally, use id to obtain the correct user ID and group ID for each user.
#!/bin/bash
UHOME="/home"
FILE="/etc/skel/.newconfig-file"
USERS=$(cut -d':' -f1 /etc/passwd) # get list of all users
for u in $USERS
do
/bin/cp $FILE ${UHOME}/${u}
chown $(id -un $u):$(id -gn $u) /${UHOME}/${u}/${FILE}
done

You can also copy multiple files using inner and outer loop concept:
#!/bin/bash
UHOME="/home"
FILES="/etc/skel/.newconfig-file /etc/skek/.update-config /chroot/jail/.force.conf"
USERS=$(cut -d':' -f1 /etc/passwd) # get list of all users
for u in $USERS
do
for f in $FILES
do
/bin/cp ${f} ${UHOME}/${u}
chown $(id -un $u):$(id -gn $u) /${UHOME}/${u}/${f}
done
done

Add additional security check such as:
* User should be a normal user
* User must have a directory
* User must have a valid password / account.