Some Linux Notes:
(Applicable to Red Hat / Centos)
1-To change the name of your hostname, edit /etc/sysconfig/network file.
2-To activate a new network interface eth1:
# ifconfig eth1 up
# ifconfig eth1
3-If after adding a new network interface your sendmail service takes long time to startup at boot time:
a- check that the new network interface exists in the /etc/hosts file
b- check that you have an alias to hostname.localdomain in /etc/hosts file
4-To customize the opening banner of your system, edit /etc/motd
5-To customize the boot loader options edit /boot/grub/grub.conf
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