Linux from the command line - using the seq command
The seq command is a perfect example of a command line tool that expresses the *NIX motto of making small, simple tools that do one thing and do it very well and letting you combine multiple of those small tools to build your own, more complex functions as necessary.
https://www.howtoforge.com/linux-seq-command/
Friday, 2 February 2018
Linux Security -- Entropy explained
Linux Security -- Entropy explained
Why you should care. These days everyone is spying on us, from criminals to our own governments and ISP's. To protect ourselves we use things like encrypted passwords, encrypted hard drives, secure VPN's etc. All of these things rely on good encryption and good encryption relies on a good source of good quality random numbers. By good quality we mean numbers that are as close to truly random as possible. The more random, the more secure you are. The problem is that generating truly random numbers is a really difficult task. To the point that governments use things like the decay of radioactive elements, to solar radiation to generate random numbers.
For those that are interested, Linux can use external sources of entropy and there are many sources available, search and find.
http://jhurani.com/linux/2017/11/01/entropy-explained.html
Why you should care. These days everyone is spying on us, from criminals to our own governments and ISP's. To protect ourselves we use things like encrypted passwords, encrypted hard drives, secure VPN's etc. All of these things rely on good encryption and good encryption relies on a good source of good quality random numbers. By good quality we mean numbers that are as close to truly random as possible. The more random, the more secure you are. The problem is that generating truly random numbers is a really difficult task. To the point that governments use things like the decay of radioactive elements, to solar radiation to generate random numbers.
For those that are interested, Linux can use external sources of entropy and there are many sources available, search and find.
http://jhurani.com/linux/2017/11/01/entropy-explained.html
Why you should use named pipes in Linux
Why you should use named pipes in Linux
https://www.networkworld.com/article/3251853/linux/why-use-named-pipes-on-linux.html
https://www.networkworld.com/article/3251853/linux/why-use-named-pipes-on-linux.html
Linux from the command line -- tmux for shell power users
Linux from the command line -- tmux for shell power users
I've posted on and praised 'screen' several times in the past for better command line usage, tmux is another great tool for your tool kit and the two actually can work well together. Also, 4k screen users MUST check out tmux.
https://www.2daygeek.com/tmux-a-powerful-terminal-multiplexer-emulator-for-linux/
I've posted on and praised 'screen' several times in the past for better command line usage, tmux is another great tool for your tool kit and the two actually can work well together. Also, 4k screen users MUST check out tmux.
https://www.2daygeek.com/tmux-a-powerful-terminal-multiplexer-emulator-for-linux/
Thursday, 1 February 2018
Linux from the command line -- wget by example
Linux from the command line -- wget by example
http://www.linuxandubuntu.com/home/12-practical-examples-of-wget-command-on-linux
http://www.linuxandubuntu.com/home/12-practical-examples-of-wget-command-on-linux
Linux from the command line -- Using the "ln" command
Linux from the command line -- Using the "ln" command
Hard and Soft links are a powerful feature of many operating systems and file-systems. They let you make things appear to be on one place while actually existing in another. The ln command is where it all happens.
https://www.howtoforge.com/linux-ln-command/
Hard and Soft links are a powerful feature of many operating systems and file-systems. They let you make things appear to be on one place while actually existing in another. The ln command is where it all happens.
https://www.howtoforge.com/linux-ln-command/
Linux Tips & Tricks | Linux from the command line | Linux for sysadmins -- monitoring network bandwidth with iftop
Linux Tips & Tricks | Linux from the command line | Linux for sysadmins -- monitoring network bandwidth with iftop
If you've used Linux for any length of time you've probably come across the 'top' command and it's siblings (htop, atop, etc.) that let you monitor CPU usage. iftop is it's network cousin and like the top family it's a great monitoring and diagnostic tool. See how much bandwidth you're using, what hosts you're using it with, and what tasks are using it.
http://linuxtechlab.com/monitoring-network-bandwidth-iftop-command/
If you've used Linux for any length of time you've probably come across the 'top' command and it's siblings (htop, atop, etc.) that let you monitor CPU usage. iftop is it's network cousin and like the top family it's a great monitoring and diagnostic tool. See how much bandwidth you're using, what hosts you're using it with, and what tasks are using it.
http://linuxtechlab.com/monitoring-network-bandwidth-iftop-command/
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