Tag: How to

How to Redirect a Page with HTTP 301 in PHP

Posted on by Eric Ma

HTTP 301 Redirect is an SEO friendly way to redirect readers to a page’s new location. There are a lot of benefits of using HTTP 301 Redirect. These benefits can be found in the htaccess method post. htaccess or PHP can be both used for sending 301 redirects. The htaccess method can be found in
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How to Change the Site’s Default 404 Error Not Found Page

Posted on by Eric Ma

The apache’s default “404 Error not found” page seems ugly. And may some hosting service put theire ads in it. We can add some entry in .htaccess to change the defualt 404 error page. This method can also be used for some other error codes. A list of the server returned codes can be found
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How to Redirect Old Domain to New Domain Using htaccess Redirect

Posted on by Eric Ma

I want to move the sub domain blog.pkill.info to systutorials.com permanently. I can manage all the pages I want to post using WordPress. Changing domain in a bad way is dangerous. Put a page the tell the reader that the site is moved to a new domain is very unfriendly to the user and also
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Emacs Tips and Howtos

Posted on by Eric Ma

With Emacs, I feel happy. I love the rich functions of Emacs, such as compiling, quickly jumping to the lines with compilation error and debugging with gdb, and more. I ever wrote small tips posts about Emacs before. But it is a good idea to put them together and keep adding new ones. Here comes
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Configuring Mouse Cursor Style for QT Applications in GNOME / MATE Desktop

Posted on by Eric Ma

QT and GTK applications use different settings for cursor styles. This makes the mouse cursor styles for QT applications in the GNOME / MATE desktop environment or GTK applications in the KDE desktop environment look different with other programs. In the post [[configuring-mouse-cursor-style-for-gtk-applications-in-kde-desktop]], we talked about how to configure the mouse cursor style for GTK
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How to Generate and Apply Patches using diff and patch on Linux

Posted on by Eric Ma

`diff` and `patch` are tools to create patches and apply patches to source code, which is widely used in the open-source world, such as Linux kernel and application. patch: applying patches To apply a patch to a single file: $ patch < foo.patch If the foo.patch does not identify the file the patch should be
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How to Flush iptables on Fedora Linux

Posted on by Eric Ma

iptables is a mechanism in Linux kernel for port forwarding, NAT, firewalls etc. In Linux distros, such as Fedora, the iptables is configured to be as a “strict” firewall that opens a limited know ports, such as 22 for SSH. However, in some network environment, such as a private cluster, the nodes are trusted and
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How to Change Systemd Runlevel on Fedora Linux – The Manual Way

Posted on by Eric Ma

Fedora Linux starts to use systemd to manage system service. The /etc/inittab is no longer used by systemd. The old method of editing /etc/inittab to change system runlevel does not work anymore. This post introduces a “manual” way to change the boot levels. For the general method, please check https://www.systutorials.com/change-systemd-boot-target-linux/. systemd uses ‘targets’ instead of
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How to Install Xen on Fedora as Domain-0 (Fedora 17)

Posted on by Eric Ma

The new development of Xen and Linux kernel make it easy to install Xen on Fedora as the Domain-0 now. This post uses Fedora 17 as an example platform to introduce how to set up Domain-0 on Fedora Linux. Compared to our old method (https://www.systutorials.com/setting-up-stable-xen-dom0-with-fedora-xen-3-4-3-with-xenified-linux-kernel-2-6-32-13-in-fedora-12/) which requires manually compiled Xen and patched kernel, the current
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How to Set Default Entry in Grub2 and Grub

Posted on by Eric Ma

Linux booting is usually controlled by Grub or the new Grub2. Setting the default booting entry is a frequent operations. Here, we introduce how to set the default entry in Grub2 and Grub. Setting the default booting entry in grub2 Note1: With some version of grub2, the grub2-set-default method and the script below may not
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How to Format (Erase) DVD+RW / DVD-RW Disks in Linux

Posted on by Eric Ma

This post introduces how to erase / blank / format a DVM+RW media on Linux in the command line. First, you need to find out the device of the DVD/CD+RW drive on your Linux box. For example, on my box with Linux 3.3.4 kernel, my DVD/CD+RW drive is /dev/sr0. You can also see what the
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How to Install MS Office 2007 on Linux using Wine

Posted on by Eric Ma

As a Linux user, I must keep a copy of Windows. One reason is that I should edit MS Office files, such as .doc, .ppt, .xls and .xml (office 2003 xml format) required by, created by or for other using Windows. Wine worked for me with Office 2003 ever but has this or that problem.
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How to Disable IPv6 on Linux

Posted on by Eric Ma

IPv6 is enabled by default on most Linux distros. However, IPv6 is not used for some situations for most of time and it may cause troubles and requires effort to protect the network and ensure the security. This post introduces how to disable IPv6 support on Linux (newer modern Kernel versions). First, add these lines
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How to Flush Linux File System Caches

Posted on by Eric Ma

We may drop the file system caches on Linux to free up memory for applications. Kernels 2.6.16 and newer provide a mechanism via the /proc/ to make the kernel drop the page cache and/or inode and dentry caches on command. We can use this mechanism to free up the memory. However, this is a non-destructive
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How to Use MPlayer to Play DVD Directories / ISO Files / Disks

Posted on by Eric Ma

MPlayer is a universal (nearly) movie/music player on Linux and many more systems. It’s also my favourite player and MPlayer plays movie or music files in any format that I drop to it. Now, let’s take a look at how to use MPlayer play DVD. MPlayer plays “DVD” in many formats: DVD disks, ISO files,
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How to SSH to Linux Hosts for Beginners

Posted on by Eric Ma

This is a simple tutorial for beginners to SSH to a Linux host. This is quite easy with the easy-to-use software freely available but the beginners need a tutorials to start with. Hence, I write this tutorial about how to ssh to a Linux host. This tutorial is for users on Windows. 1. Download a
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Extending a LVM Volume Group

Posted on by Eric Ma

We introduced how to create a LVM group with two hard disk partitions, which the LVM group can be used for [[setting-up-lvm-backed-xen-domu|installing LVM backed Xen DomUs]]. The LVM volume can have large capacity from several hard disks. However, we may use all the disk space after some time and we may need to extend the
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How to Change Hostname of Fedora Linux

Posted on by Eric Ma

Different Linux distros have different method to set the hostname. On Fedora Linux, it is quite simple. On newer Fedora releases At least from Fedora 19 (sorry, no sure the exact earliest version): You need to edit the file /etc/hostname which just contains the hostname. On older Fedora releases Sorry, I do not know the
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