Oracle Linux/Quick Reference

yum

update repo cache (agt-get update equivalent)

~$ yum check-update

update all packages

~$ yum update

install software

~$ yum install lynx

search for software

~$ yum search apache

remove software

~$ yum remove lynx

search for package by command

~$ yum whatprovides dig

Add user & add to sudoers

add user

~$ useradd user

set password for user

~$ passwd user

add to sudoers

~$ visudo
...
user ALL=(ALL) ALL

determine packages installed & search

~$ rpm -qa | less | grep term

netstat

determine gateway

~$ netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.45.9.1       0.0.0.0         UG        0 0          0 eth0
10.45.9.0       0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0

disable selinux

~$ /etc/selinux/config
change SELinux=enforcing to SELinux=disabled

check linux version

~$ rpm -qf /etc/redhat-release

release and renew ip (dhcp)

release

~$ sudo dhclient -v -r eth0

renew

~$ sudo dhclient -v eth0

check and change DNS servers

~$ sudo vi /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4

Install epel repo

~$ yum install epel-release