Linux Basics

Q. How do I install and configure NTP under CentOS Linux 5 server to synchronize the system clock? A. You can easily install NTP (Network Time Protocol, a means of transmitting time signals over a computer network) using yum command under Redhat or CentOS/Fedora core Linux. Procedure Login as the root user Type the following command to install ntp # …

If you are run on cPanel server and have FastCGI enabled in Apache, you might facing following error which caused your website hang or prompting ’500 Internal Server Error’ message. When checking into/etc/httpd/log/error_log, you will see something similar as below: [warn] .. mod_fcgid: read data timeout in 40 seconds, ... [error] .. Premature end of script headers: index.php ... This …

I recently installed CentOS Linux version 7 or Red Hat Enterprise Linux version 7. How can I restart networking service using command line options? How can I start / stop and restart networking service on a CentOS/RHEL 7 based system?CentOS 7 / RHEL 7 / Fedora Linux (many other modern distor) uses Systemd. It is a system and service manager …

How do I view and set date under UNIX operating systems? The date command under UNIX display date. It is also used to set date and time. You must be the super-user (root) to change the date and time. UNIX Date Command Syntax date date "+format" Task: Display Current Date and Time Type the following command: date Sample outputs: Tue …

How do I run a Linux shell script? How can I run a script in Linux? By default script will not run. You need to set execute permission for your script. To execute or run script type the following command: chmod +x script-name-here OR chmod 0755 script.sh Use the ls command to view permission on the script: $ ls -l …

Command line is more powerful because you can do  lot with them,  you can tell your computer exactly what you want and get the appropriate answer, while GUI application can only tell your computer what the GUI programmer has defined.  Recently, CLI is mostly used by Linux/Unix administrators since most popular linux distros come with a complete set of GUI applications that …

Cron is a daemon that can be used to schedule the execution of recurring tasks according to a combination of the time, day of the month, month, day of the week, and week. This is how I install crond onto my CentOS server edition as it doesn’t seem to come preinstalled, this might not be true for other distributions and …