Learning Bash Scripting for Beginners

<p>Bash (Bourne-Again SHell) is a Linux and Unix-like system shell or command language interpreter. It is a default shell on many operating systems including Linux and Apple OS X.<br /> <br /> If you have always used a graphic user interface like KDE or Gnome or MS-Windows or Apple OS X, you are likely to find bash shell confusing. If you spend some time with the bash shell prompt and it will be difficult for you to go back.<br /> <br /> <a href="http://www.cyberciti.biz/open-source/learning-bash-scripting-for-beginners/" target="_blank">Complete story >>></a></p>

Bash (Bourne-Again SHell) is a Linux and Unix-like system shell or command language interpreter. It is a default shell on many operating sys...

Setup a mail server with Postfix and Dovecot on Ubuntu / Debian

<p>Mail system for your own domain<br /> You have your own domain name and your very own vps/dedicated server and want to use the domain name for emails. So you need to setup a mail server using an smtp server and an imap/pop server.<br /> This tutorial shows you how to setupPostfix (smtp server) and Dovecot (imap/pop server). The task of the smtp server is to accept incoming mails and relay outgoing mails from authorised users on the system.<br /> Whereas Dovecot allows authorized users to access their Inbox and read whatever mails there are...<br /> <br /> <a href="http://www.binarytides.com/install-postfix-dovecot-debian/" target="_blank">Complete story >>></a></p>

Mail system for your own domain You have your own domain name and your very own vps/dedicated server and want to use the domain name for em...

Awesome cheat sheet for CentOS and RHEL. Include common sysadmin administrative commands

<p>RED HAT ENTERPRISE LINUX 5, 6, AND 7<br /> Common administrative commands ... <a href="https://access.redhat.com/sites/default/files/attachments/rhel_5_6_7_cheatsheet_a4_1114_jcs.pdf" target="_blank">Complete story >>></a></p>

RED HAT ENTERPRISE LINUX 5, 6, AND 7 Common administrative commands ...  Complete story >>>

7 Most Useful Network Monitoring Tools

<p>In the networking world and server admin world, it’s all about visibility. If you are not aware what your network and servers are doing right now, then it might prove disastrous for you. There are some excellent tools, which are both commercial and open source, which can help you in the networking world. These tools are excellent to use for network and server monitoring, graphing and so on. Here are seven such tools for you :<br /> <br /> <a href="http://azure.efytimes.com/?p=594" target="_blank">Complete story >>></a></p>

In the networking world and server admin world, it’s all about visibility. If you are not aware what your network and servers are doing righ...

How To Mount Remote Directory With SSHFS on a Linux

<p>SSH is a secure protocol and you can use it to mount a directory on a remote server or local laptop with the help of the SSHF service. With SSHFS you can mount remote server file system to your local development workstation/laptop powered by Linux..<br /> <br /> <a href="http://www.cyberciti.biz/faq/how-to-mount-remote-directory-filesystems-with-sshfs-on-linux/" target="_blank">Complete story >>></a></p>

SSH is a secure protocol and you can use it to mount a directory on a remote server or local laptop with the help of the SSHF service. With ...

How to block specific user agents on nginx web server

<p>The modern Internet is infested with various malicious robots and crawlers such as malware bots, spambots or content scrapers which are scanning your website in surreptitious ways, for example to detect potential website vulnerabilities, harvest email addresses, or just to steal content from your website. Many of these robots can be identified by their signature "user-agent" string.<br /> <br /> <a href="http://ask.xmodulo.com/block-specific-user-agents-nginx-web-server.html" target="_blank">Complete story >>></a></p>

The modern Internet is infested with various malicious robots and crawlers such as malware bots, spambots or content scrapers which are scan...

How To Patch and Protect Linux Server Against the VENOM Vulnerability # CVE-2015-3456

<p>A very serious security problem has been found in the virtual floppy drive QEMU's code used by many computer virtualization platforms including Xen, KVM, VirtualBox, and the native QEMU client. It is called VENOM vulnerability. How can I fix VENOM vulnerability and protect my Linux server against the attack? How do I verify that my server has been fixed against the VENOM vulnerability?<br /> <br /> <a href="http://www.cyberciti.biz/faq/cve-2015-3456-patch-venom-on-debian-ubuntu-fedora-centos-rhel-linux/" target="_blank">Complete story >>></a></p>

A very serious security problem has been found in the virtual floppy drive QEMU's code used by many computer virtualization platforms in...

11 Useful Cloud Computing Tutorials

<p>Cloud computing is the future, you may have heard someone say this before. Here are 11 tutorials that will get you through various aspects of dealing with the cloud.<br /> <br /> <a href="http://azure.efytimes.com/?p=381" target="_blank">Complete story >>></a></p>

Cloud computing is the future, you may have heard someone say this before. Here are 11 tutorials that will get you through various aspects o...

Wireshark 1.12.5 Officially Released, Still the World’s Most Popular Network Analyzer

<p>Wireshark, the world's most popular open-source, cross-platform, and free network analyzer software, has been updated to version 1.12.5, a release that fixes numerous issues, patches important security vulnerabilities, and updates protocol support.<br /> <br /> According to the release notes, Wireshark 1.12.5 no more than seven vulnerabilities discovered in the LBMR, WebSocket, WCP, X11, and IEEE 802.11 dissectors, as well as in the Android Logcat file parser and the packet reassembly code.<br /> <br /> <a href="http://news.softpedia.com/news/Wireshark-1-12-5-Officially-Released-Still-the-World-s-Most-Popular-Network-Analyzer-480998.shtml" target="_blank">Complete story >>></a></p>

Wireshark, the world's most popular open-source, cross-platform, and free network analyzer software, has been updated to version 1.12.5,...

How to sniff HTTP traffic from the command line on Linux

<p>Suppose you want to sniff live HTTP web traffic (i.e., HTTP requests and responses) on the wire for some reason. For example, you may be testing experimental features of a web server. Or you may be debugging a web application or a RESTful service. Or you may be trying to troubleshoot PAC (proxy auto config) or check for any malware files surreptitiously downloaded from a website. Whatever the reason is, there are cases where HTTP traffic sniffing is helpful, for system admins, developers, or even end users.<br /> <br /> <a href="http://www.itsprite.com/linuxhow-to-sniff-http-traffic-from-the-command-line-on-linux/" target="_blank">Complete story >>></a></p>

Suppose you want to sniff live HTTP web traffic (i.e., HTTP requests and responses) on the wire for some reason. For example, you may be tes...

How to monitor user login history on CentOS with utmpdump

<p>Keeping, maintaining and analyzing logs (i.e., accounts of events that have happened during a certain period of time or are currently happening) are among the most basic and essential tasks of a Linux system administrator. In case of user management, examining user logon and logout logs (both failed and successful) can alert us about any potential security breaches or unauthorized use of our system. For example, remote logins from unknown IP addresses or accounts being used outside working hours or during vacation leave should raise a red flag.<br /> <br /> <a href="http://www.itsprite.com/how-to-monitor-user-login-history-on-centos-with-utmpdump-2/" target="_blank">Complete story >>></a></p>

Keeping, maintaining and analyzing logs (i.e., accounts of events that have happened during a certain period of time or are currently happen...

CentOS-Based Rocks Cluster Specialist Distribution 6.2 Updates ZFS Support

<p>Philip Papadopoulos announced on May 11 the immediate availability for download of Rocks Cluster 6.2, a specialist Linux kernel-based operating system derived from the well-known CentOS distribution, which in turn is based on Red Hat Enterprise Linux.<br /> <br /> Dubbed Sidewinder, Rocks Cluster 6.2 is now based on the CentOS 6.6 operating system, and it includes all the upstream package updates as on May 10, 2015. It is available for download as an installable-only ISO image that runs only on 64-bit capable computers.<br /> <br /> <a href="http://news.softpedia.com/news/CentOS-Based-Rocks-Cluster-Specialist-Distribution-6-2-Updates-ZFS-Support-480880.shtml?utm_content=buffer263ca&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer" target="_blank">Complete story >>></a></p>

Philip Papadopoulos announced on May 11 the immediate availability for download of Rocks Cluster 6.2, a specialist Linux kernel-based operat...

How to view torrent file content on Linux

<p>A torrent file (i.e., a file with .torrent extension) is a BitTorrent metadata file which stores information (e.g., tracker URLs, file list, sizes, checksums, creation date) needed by a BitTorrent client to download files shared on BitTorrent peer-to-peer networks. Inside a single torrent file, one or more files can be listed for sharing.<br /> <br /> <a href="http://ask.xmodulo.com/view-torrent-file-content-linux.html" target="_blank">Complete story >>></a></p>

A torrent file (i.e., a file with .torrent extension) is a BitTorrent metadata file which stores information (e.g., tracker URLs, file list,...

10 basic examples of linux netstat command

<p><span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">Netstat is a command line utility that can be used to list out all the network (socket) connections on a system. It lists out all the tcp, udp socket connections and the unix socket connections.</span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">Apart from connected sockets it can also list listening sockets that are waiting for incoming connections. So by verifying an open port 80 you can confirm if a web server is running on the system or not. This makes it a very useful tool for network and system administrators...</span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><br /></span> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><a href="http://www.binarytides.com/linux-netstat-command-examples/" target="_blank">Complete story >>></a></span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><br /></span> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><br /></span></p>

Netstat is a command line utility that can be used to list out all the network (socket) connections on a system. It lists out all the tcp, u...

10 examples of Linux ss command to monitor network connections

<p>ss = socket statistic<br /> <br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">In a previous tutorial we saw how to use the netstat command to get statistics on network/socket connections. However the netstat command has long been deprecated and replaced by the ss command from the iproute suite of tools...</span><br /> <br /> <br /> <a href="http://www.binarytides.com/linux-ss-command/" target="_blank">Complete story >>></a></p>

ss = socket statistic In a previous tutorial we saw how to use the netstat command to get statistics on network/socket connections. Howeve...

Setup a mail server with Postfix and Dovecot on Ubuntu / Debian

<p><span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">Mail system for your own domain</span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">You have your own domain name and your very own vps/dedicated server and want to use the domain name for emails. So you need to setup a mail server using an smtp server and an imap/pop server.</span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">This tutorial shows you how to setupPostfix</span><span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"> (smtp server) and Dovecot (imap/pop server). The task of the smtp server is to accept incoming mails and relay outgoing mails from authorised users on the system.</span><br /> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;">Whereas Dovecot allows authorized users to access their Inbox and read whatever mails there are...</span><br /> <div> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><br /></span></div> <div> <span style="background-color: white; color: #333333; font-family: sans-serif; font-size: 14.6666669845581px; line-height: 22px;"><a href="http://www.binarytides.com/install-postfix-dovecot-debian/" target="_blank">Complete Story >>></a></span></div> </p>

Mail system for your own domain You have your own domain name and your very own vps/dedicated server and want to use the domain name for em...