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Simple Patch Tools

Simple Patch Tools

Creating: When all you want to do is build a patch file that contains only the changes you've made today. Installing: I typically want to take a backup of the files that are going to be overwritten so that I can quickly undo the patch if necessary.

The Bash Script To Configure The Firewall Using IPTABLES

About the Script:

This script is about to build a firewall in Linux OS by using iptables, the user only needs to follow and answer the simple and easy steps and the script will generate the user specified iptables rule in its original form.

I HAVE TESTED THE SCRIPT ON PCLINUXOS, FEDORA-9, DREAM_LINUX, UBUNTU-8.

This is my iptables Version 1.0 (USMAN AKRAM - Lucky)

Useful Commands For The Linux Command Line

Useful Commands For The Linux Command Line

This short guide shows some important commands for your daily work on the Linux command line.

How can I observe a logfile continuously?

With the command:

tail -f /path/to/logfile

you will see all lines added to the logfile. To stop this, press [CTRL] + c

How to save a command in the shell history without executing it

Enter the command line and hit the keys:

[CTRL] + [#]

This will put a # in front of the command and execute it. The shell will take it as comment.

How can I clear the shell window?

Use the commad:

clear

or the keyboard shortcut:

[CTRL] + [L]

Creating image borders with ImageMagick convert

The command is:

convert -border 2x2 old.jpg new.jpg

This creates a new image (new.jpg) with a 2 pixel border from the image old.jpg.

To set the bordercolor to red, use this command:

convert -border 2x2 -bordercolor "#FF0000" old.jpg new.jpg

Get a list of the installed services

To get a list of the installed services on the shell, you may use this command (on Fedora, RedHat, CentOS, SuSE, and Mandriva):

chkconfig --list

Show all processes for a specific user

To view only the processes owned by a specific user, use the following command:

top -U [USERNAME]

and replace [USERNAME] with the name of the user.

Making snapshots of the process table shown by the TOP command

To make a snapshot of the current process table, use the following command:

top -n 1 -b > /tmp/processtable.txt

You can now view the textfile with any text editor, e.g. pico or vi.

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