ServerBuddies Support Blog

Exclude packages from yum update

Example on how to exclude a number of packages:

1. Open /etc/yum.conf with your preferred text editor.

2. Enter the following line with your package names:

Tags: yum

Selecting a cPanel Build Type Pre-Installation

You can define your build type by defining the variable CPANEL. cPanel offers 4 build types to choose from: stable, release, current, and edge.

To choose the build type, add 1 of the 4 following lines to /etc/cpupdate.config.

The cPanel and WHM interfaces will be installed according to which of the 4 options you define in the configuration file.

Tags: cpanel

tee command

Print the results to the screen but also to a file.

You can enter more than one filename if you want multiple copies.

Tags: command, tee

Cron is a time-based job scheduler in Unix-like computer operating systems.

cron - daemon to execute scheduled commands (Vixie Cron)

Example: the following will clear the Apache error log at one minute past midnight each day.

There is also an operator which some extended versions of cron support, the slash (’/') operator (called “step”), which can be used to skip a given number of values. For example, “*/3″ in the hour time field is equivalent to “0,3,6,9,12,15,18,21″.

So “*” specifies ‘every hour’ but the “*/3″ means only those hours divisible by 3.

Tags: cron

How do I keep my crontab from sending an email every time it runs?

Add the following > /dev/null 2>&1

The >> /dev/null 2>&1 part means to send any standard output to /dev/null (the linux trash can) and to redirect standard error (2) to the same place as the standard output (1). Basically it runs the command without any output to a terminal etc.

If you wanted to save the output of a certain command you can replace the “>> /dev/null 2>&1″ with “>> /home/user/script.log 2>&1″

Tags: crontab