GUI of redhat is maintained by XORG
All config files related to GUI is available in /etc/X11

1. Gui in runlevel 3  --> /etc/X11/xinit/xinitrc
2. Gui in runlevel 5  --> /etc/X11/prefdm

vim /etc/X11/xorg.conf  -->config files to set display resolution
system-config-display  -->tool to change display settings


Syntax:   startx -- :n    ->where n is number.
EX:       startx -- :5    ->create 5th gui.

Configuring vnc server (virtual network console )

Server Config
1. yum list vnc-server

2a. vncserver    -->creates passwd and creates .vnc/xstartup file  OR
2b. vncpasswd    -->change passwd

3. vim /root/.vnc/xstartup
   uncomment first 2 lines of above file
4. vim /etc/sysconfig/vncservers
   uncomment last two lines of file + set
   root:20          ->where root is user and 20 is session id
5. service vncserver restart

Client Config
1. yum install vnc -y
2. vncviewer        //Opens a rectangular box
3.  type serverip:sessionid / and you get connectd to server gui

SSH  -->secured shell remote login
ssh  <remoteip> -->connect to text terminal of remote machine
ssh  <user>@<remoteip> ->connect as u1 txt termial of remote machine
ssh -X <remoteip> -->connect to GUI of of remote machine
ssh  <remoteip> <command> -->execute command from remote machine

Crontab  -->used to schedule jobs

1. cat /etc/crontab  -->main config file of crontab
   cat /etc/cron.weekly  -->system scheduled weekly job
   cat /etc/cron.hourly  -->system scheduled hourly job
   cat /etc/cron.monthly -->system scheduled montly job
   cat /etc/cron.deny  -->adding user to this file denies user
                          from scheduling job

2. User scheduled cron jobs are stored here.
  ls  /var/spool/cron/root
  ls  /var/spool/cron/student.

cat /etc/cron.allow file doens not exist, if you add user to
both /etc/cron.deny and /etc/cron.allow file.
cron.allow file takes precedence.

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