Linux IAAS, Usefull commands

One you have attached a volume here you have usefull commands:

Disk information:

lsblk
blkid

Mount: sudo mount /dev/xvdc /mnt/opc_data

Format : sudo mkfs -t ext3 /dev/xvdc

Install if needed:
sudo yum install e4fsprogs

Create folder if needed:
sudo mkdir /mnt/opc_data

mount as default:
vi /etc/fstab

add following line:
/dev/xvdc               /mnt/opc_data        ext3    defaults        0 0

Change user and group one command:
sudo chown opc:opc opc_data/

Check if process is on startup:
chkconfig --list | grep vncserver
"vncserver       0:off   1:off   2:on    3:on    4:on    5:on    6:off"

install vncserver if not installed:
yum install tigervnc-server

Put vncserver on startup:
sudo chkconfig vncserver on

Configure vncserver once installed (modify according your settings)
cat  /etc/sysconfig/vncservers

VNCSERVERS="2:opc 3:oracle"
VNCSERVERARGS[2]="-geometry 1280x1024 -nolisten tcp -localhost"
VNCSERVERARGS[3]="-geometry 1280x1024"

Restart Service

sudo service vncserver start
sudo service vncserver stop

sudo service vncserver status

Use vncpasswd to change password users

vncpasswd opc

If you don't have xterm install it
sudo yum install xterm

Enable X11Forwarding

sudo vi /etc/ssh/sshd_config

Restart sshd

sudo /etc/init.d/sshd restart

With operative systems with no graphic interface, but you want enable vncserver:

gconftool-2 -s -t bool /apps/gnome-screensaver/lock_enabled false

vncserver :3 -depth 16 -alwaysshared -geometry 1200x1024 -s off

sudo yum install xorg-x11-twm

sudo yum install xterm

sudo yum install xsetroot

sudo yum install xorg-x11-apps

Add LC_ALL=en_US; export LC_ALL=en_US in .bashrc or in .bash_profile 

sudo yum install liberation-sans-fonts

same procedure as vncserver

search text in files recursively in a folders and subfolders:
grep -rl 'windows' ./ | xargs sed -i 's/windows/linux/g'

grep -rnw . -e 172.28.88.111 --exclude-dir={*.out,*.log}
grep -rnw . -e 172.28.88.111 --exclude={*.out*,*.log*}

using escape character: 
grep -rl '/opt/oracle/obiee/user_projects' ./ | xargs sed -i 's/\/opt\/oracle\/obiee\/user_projects/\/opt\/oracle\/admin\/user_projects/g'

Create aliases .bash_aliases file, Example:
alias startobi='sh $ORACLE_BI_HOME/bitools/bin/start.sh'
alias stopobi='sh $ORACLE_BI_HOME/bitools/bin/stop.sh'

Disable firewall
systemctl disable firewalld.