There are a lot of people do not know what these variables and how they can be used , this Variables exist in php.ini file , the php.ini file is contains settings PHP on server , and for each variable in the php.ini file have a special role and can be disabled and activated with ON and Off

Disable = Off

Activate = On

So now I will explain to you the benefit of each function and put you a choice in the activation and disable

expose_php

Is a a property from which to see PHP version on the server so disabling means not making available to the hacker to know the version of PHP

allow_url_fopen

When you disable this function no one will be able to contain another link in a specific page , but some scripts like AM4SS – Vbulletin need this function for the arrival of notifications within the Admin Control Panel

register_globals

When you Desable this function become possible to control the content of php files difficult and does not allow the Edited only by the owner
So now we come to the disabled and activation of these properties

Enter in the shell and modify the php.ini file with the following command

nano /usr/local/lib/php.ini

By pressing Ctrl + W will open new box writes what you want to search for inside file

Looking for the variable you want edited for example

allow_url_fopen

You’ll find as follows :

allow_url_fopen = On

Mark value after the mark (=) On for activate Off  for disabled , Apply it with the rest of the properties , After completion of the amendment to click on the keys CTRL + X + Y then Enter button

You will see a new command line in the main interface in shell
Observation : you must restart Apache after any amendment to this file for edited is defined in the php and Apache
To restart apache :

service httpd restart

Or you can restart apache using server Control Panel WHM In a private box to restart services From there you can restart any service you want to.

The post What is the role of this variables in php.ini file (expose_php – allow_url_fopen – register_globals) ? appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

To clear shell history, type the following command:

$ history -c

Or remove .bash_history file

$ rm -rf ~/.bash_history

Turn off shell history

To turn off shell history for all users, type the following command as root

# echo "unset HISTFILE" >> /etc/profile

To turn off shell history for a specific user, type the following command

$ echo "unset HISTFILE" >> /home/USER/.bash_profile

Display shell history

To display shell history, type the following command

$ history | more

Sample outputs

74  exit
75  cd /etc/samba/
76  ll
77  vi smb.conf
78  exit
79  cd /home/site.com/scripts/
80  dir
81  cd cassandra/
82  dir
83  cd conf/
84  duir
...

The post How To Clear Shell History On Centos / RedHat appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.

To find the linux kernel version, you should login and type the following command

$ uname -r

Sample output

2.6.18-194.32.1.el5

A second way is to look at the /proc/version file, type the following command

$ cat /proc/version

Sample output

Linux version 2.6.18-194.32.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Wed Jan 5 17:52:25 EST 2011

A third way is to look at the contents of the dmesg command, type the following command

$ dmesg | grep Linux

Sample output

Linux version 2.6.18-194.32.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Wed Jan 5 17:52:25 EST 2011
SELinux:  Initializing.
SELinux:  Starting in permissive mode
Linux Plug and Play Support v0.97 (c) Adam Belay
SELinux:  Registering netfilter hooks
Linux agpgart interface v0.101 (c) Dave Jones
SELinux:  Disabled at runtime.
SELinux:  Unregistering netfilter hooks

The post How To Find The Linux Kernel Version ? appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.