I was trying to compile Letsencrypt package on my CentOS machine and landed up on this error message – ImportError: No module named virtualenv. ./letsencrypt-auto  :::::::::::::::::::::::::::: Traceback (most recent call last): File “/usr/bin/virtualenv”, line 2, in <module> import virtualenv ImportError: No module named virtualenv By default virtualenv was installed under ‘/usr/local/bin‘, but executing…

Question: Thanks for the tutorial on “How to login to Linux instance using keys“. I used PPK key file via PuTTy to login to my Linux instance. Could you tell me how to convert PPK file into OpenSSH keys format, so that I can login to my instance using SSH command…

I have been using LogWatch on my CentOS box to monitor Kernel errors, mailbox usage, disk usage, refused SSH connections, HTTP errors, sudo usage etc…(checkout this tutorial to Configure LogWatch). I have also configured it to generate daily reports and mail it to my personal gmail id. I have been…

I was trying to compile Python from source – the steps involved are configure, make, make install and luckily everything went on well. But at the end of make install, I get this error message “Ignoring ensurepip failure: pip 7.1.2 requires SSL/TLS“. I do have OpenSSL installed as shown below….

I had successfully compiled Python3.5 from source. But when I execute ‘python3.5‘ command, I get an error message as “Fatal Python error: Py_Initialize: Unable to get the locale encoding. ImportError: No module named encodings“. Here’s the complete error message: # python3.5 Fatal Python error: Py_Initialize: Unable to get the locale encoding ImportError: No…

I was trying to configure LibVMI library on Xen Hypervisor. While autogen.sh went on fine, the configure script failed with an error message as – configure: error: cannot find macro directory ‘m4‘. I tried to install ‘m4‘ package using ‘yum install m4‘, but it seems like the package is already installed…

Well, you may call this as a Linux tip for the day. I’m going to share a tip that lets you to execute a command in shell prompt and does not save it in command history. Generally any command you execute in shell gets stored in a command history and the…

I recently installed MakeMyTrip app on Android to book a hotel for my vacation. The app was good and in fact I booked a hotel and enjoyed my trip. But the biggest problem with the app is that, it sends out too many notifications (deals, promotions etc…) and that was really…

I have been using Ctrl-L to clear the screen in BASH, but for some reason it stopped working. Now when I hit Ctrl-L, a new line is created instead of clearing the screen. May be the issue is due to my recent update of BASH (from version 3.1 to version 4.3, to…

Shellshock vulnerability was found during the late 2014 (to be precise, the impact was posted on CVE-2014-6271 on 24 September 2014). Later an update was released in bash version 4.1.2-15 with a fix for Shellshock vulnerability. Well, the entire world gone on to update the bash and secured their shell from Shellshock,…

If you are a regular reader at Techglimpse, then you might have read our article on How to extract .xz file packages in Linux. Well, that tutorial was primarily aimed at installing XZ utils to read .xz file packages in Linux. But you can also use ‘tar‘ command to read and extract…

I was trying to compile latest version of ‘tar‘ (version 1.28) from source. The ./configure script exited with an error message as “error: you should not run configure as root“. As suggested in the error, I quit from ‘root‘ user and executed the configure script as unprivileged user. The error…

Hi, I recently followed your guide to install Python-pip on my CentOS Box. As you had told in the article, ‘yum install python-pip‘ didn’t work, probably I need to configuring another yum repository. Anyway I tried wget https://bootstrap.pypa.io/get-pip.py and install it via ‘python2.4 get-pip.py‘ command. Unfortunately, the command exited with an error message…

Today I came across an interesting command ‘[‘ (square bracket) via the famous Linux blog called nixCraft. It was quite an interesting post that explained the use of ‘/usr/bin/[‘ command in Linux. But you know what, I have been working in Linux for few years now and I didn’t know this…

Ever want to check if a particular visitor to your website is from a mobile device or desktop using PHP? then here’s how you can do that. $_SERVER in PHP, a super global variable or an array that contains information about the server’s hostname, remote IP address, HTTP user agent, script…

Less than a month ago, I wrote few articles on Ghost spams and how to block an unwanted web traffic via spam referrals. Today, I saw another spam referral in Google analytics – this time, the spammer is qualitymarketzone dot com. This spam referrer has made few entries in my Analytics report…

I’m quite new using MediaWiki version 1.24.4. The MediaWiki allows me to upload files such as PDF, docx, ppt etc…and it works fine as well. But I get this error ‘Error creating thumbnail: Unable to save thumbnail to destination‘ while uploading image files such as jpeg or png. I’m able…

There are few ways through which you can reset the user account’s password in MediaWiki. The first method is by using changePassword.php maintenance script – the administrator can reset the password and communicate the same to the user. The second method is by logging-into the database server and using SQL queries to…

I have been using VIM editor for quite a long time, but until today I didn’t know how to open and edit multiple files at once and switch between those quickly. I’m writing this tutorial for people like me who didn’t know about Buffers in VIM editor. To edit multiple files using…