sed -i "s/^127.0.0.1[ \t]*$OLDHOSTNAME[ \t]*localhost/127.0.0.1 $HOSTNAME localhost/" /etc/hosts
sed -i "s/^::1[ \t]*ip6-localhost ip6-loopback[ \t]*$OLDHOSTNAME/::1 ip6-localhost ip6-loopback $HOSTNAME/" /etc/hosts
POSTFIX=''
if [ -r /etc/postfix/main.cf ] ; then
sed -i "s/^127.0.0.1[ \t]*$OLDHOSTNAME[ \t]*localhost/127.0.0.1 $HOSTNAME localhost/" /etc/hosts
sed -i "s/^::1[ \t]*ip6-localhost ip6-loopback[ \t]*$OLDHOSTNAME/::1 ip6-localhost ip6-loopback $HOSTNAME/" /etc/hosts
POSTFIX=''
if [ -r /etc/postfix/main.cf ] ; then