Linux System Administrator's Guide. Bash String Manipulation Examples – Length, Substring, Find and Replace. In bash shell, when you use a dollar sign followed by a variable name, shell expands the variable with its value.
This feature of shell is called parameter expansion. But parameter expansion has numerous other forms which allow you to expand a parameter and modify the value or substitute other values in the expansion process. Unix and Linux. Man page. Explainshell.com - match command-line arguments to their help text. ShellCheck – Online shell script analyzer.
Manage, share and source your aliases online. LinuxCommand.org: Learn the Linux command line. Write shell scripts. Examplenow - Linux, UNIX command line examples. Useful Unix commands for data science. Imagine you have a 4.2GB CSV file.
It has over 12 million records and 50 columns. All you need from this file is the sum of all values in one particular column. How would you do it? Writing a script in python/ruby/perl/whatever would probably take a few minutes and then even more time for the script to actually complete. A database and SQL would be fairly quick, but then you'd have load the data, which is kind of a pain. Unix. Linux. Cron. LINUX. LINUX. Ubuntu. Genaral commands Unix. Distrowatch. Arch. Manjaro official. LINUX. Coursera.org. Web Search Results.
Uninstall Survey. Recently I was developing at home, where I do not have Visual Assist; it was so much slower.
It was like programming with stone knives and bearskins. Visual Assist has been so good I don't notice it anymore – until I use an IDE without it. Linux-Unix Cheat Sheets - The Ultimate Collection. HowtoForge - Linux Howtos and Tutorials. XenoCafe - Learn Linux the easy way with our free comprehensive tutorials for beginners. Linux Commands - A practical reference. The Incredible Guide to NEW Ubuntu (Karmic Koala) [PDF] With the recent release of a new Ubuntu, Karmic Koala, we felt it was time to go back to the roots and beyond.
Enter the Ubuntu Karmic Koala Bible – a guide that’s both great for Linux initiates as well as for Linux intermediates. With 50+ easy to follow tutorials, this guide belongs in the virtual library of every Linux user! The guide is aimed, not only familiarizing you, but on making your Linux experience easier in general. Beginner's Guide to Nmap. Ever wondered how attackers know what ports are open on a system?
Or how to find out what services a computer is running without just asking the site admin? You can do all this and more with a handy little tool called Nmap.