How do I change the IP address/netmask and hostname on the command line WITHOUT rebooting the machine?

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Here are some example configuration files:

/etc/hosts

127.0.0.1      localhost.localdomain  localhost
192.168.0.254  server1.example.com    server1

/etc/sysconfig/network

NETWORKING=yes
HOSTNAME=server1.example.com
GATEWAY=192.168.0.1

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=static
IPADDR...

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