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Dr. Sean Elvidge

Lecturer in Space Environment creating the next generation space weather forecast models. Included on Forbes 30 Under 30 list

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Category: Linux

Installing TIE-GCM on Ubuntu using gfortran

June 23, 2018 Sean Linux, Science 5 Comments on Installing TIE-GCM on Ubuntu using gfortran

This is a very specific post, most people will want to skip over it entirely. It is about how to install the ionosphere/thermosphere model TIE-GCM on Ubuntu computers using gfortran.

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Unblock IP address from connecting via SSH

March 8, 2018 Sean Linux Leave a Comment on Unblock IP address from connecting via SSH

I manage a small cluster at work and occasionally students get their IP address banned by entering the wrong password when logging into the cluster. I don’t fix the problem often enough to remember how to do it, so I thought I’d jot it down here for future reference.

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Passwordless SSH on CentOS

June 22, 2017January 25, 2018 Sean Linux Leave a Comment on Passwordless SSH on CentOS

The CentOS wiki page misses out a crucial step in setting up passwordless SSH.

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Rescan Wireless Networks on Ubuntu

March 6, 2017 Sean Linux Leave a Comment on Rescan Wireless Networks on Ubuntu

Sometimes I can’t find wireless networks which I know exist (on Ubuntu 16.04). Forcing the wireless interface to rescan fixes the problem. 

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Delete large number of jobs with SGE

February 24, 2017February 24, 2017 Sean Linux Leave a Comment on Delete large number of jobs with SGE

Sometimes I accidentally add lots of jobs to our SGE queue and want a quick way to delete them.

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Install G77 on Ubuntu >=14.04

January 31, 2017May 8, 2018 Sean Linux 13 Comments on Install G77 on Ubuntu >=14.04

In 2012 I wrote how to install G77 on Ubuntu >=9.04. However that approach no longer works (yet that particular blog posts gets lots of hits because of a link from stackoverflow). So here are some updated instructions which work for Ubuntu >= 14.04.

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How to Install the Edimax AC600 Wireless Driver for the Raspberry Pi

January 30, 2017April 4, 2019 Sean Linux 16 Comments on How to Install the Edimax AC600 Wireless Driver for the Raspberry Pi

I use an Edimax AC600 series USB wireless device for my raspberry pi on Raspbian. Here is the easy way to install the driver for it. 

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Safe Reboot of Locked Linux Machine

March 20, 2015December 15, 2015 Sean Linux Leave a Comment on Safe Reboot of Locked Linux Machine

Sometimes your Linux machine will lock up, it just happens. But before you reach for the reset button try and use the magic SysRq key combination to try and perform a safe reboot.

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Quick way to remove X Server for running a headless server

May 10, 2014May 20, 2014 Sean Linux 2 Comments on Quick way to remove X Server for running a headless server

I use my Raspberry Pi as a headless server so do not need anything that relies on X11, this is a quick way to get rid of everything that depends on X11 to save some space.

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Making files and folders lowercase

October 21, 2013October 21, 2013 Sean Linux Leave a Comment on Making files and folders lowercase

Very occasionally I want to make all the files and folders of a particular directory lowercase (usually when porting an existing directory structure from Windows to Linux) this is how I do it. 

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