After a system update with using pacman on ArchLinux, you will probably have some core configuration files that are out of date. Pacman handles this by creating new config files and appending .pacnew to their name. Here's a simple script to find all the pacnew files and merge them with the your current config files using
meld:
for PACNEW_FILE in `find /etc/ -name "*.pacnew"`; do
BASE_FILE=`echo $PACNEW_FILE | sed '/\.pacnew//'`;
meld $PACNEW_FILE $BASE_FILE;
echo -n "Remove the file $PACNEW_FILE ? [y|n] ";
read -n 1 CHOICE
if [ "$CHOICE" = "y" ]; then
rm $PACNEW_FILE;
fi
done;