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Linux Commands – Remove All Text After X 1. Overview There are various occasions when we might want to remove the text after a specific character or set of characters. For example, one typical scenario is when we want to remove the extension of a particular filename. In this quick… Continue Reading remove-text-after-x-in-file
Linux Commands – Parallel Downloading with wget 1. Overview In this tutorial, we’ll use a simple tool wget to download multiple files in parallel. The commands used in this article were tested in bash, but should work in other POSIX compliant shells as well. 2. Downloading Files with wget Downloading files… Continue Reading wget-parallel-downloading
Linux Commands – Looping Through Directories 1. Overview There are various occasions when we might want to loop through all the directories in a given folder. For example, we may want to iterate through all the directories and run a particular command in each folder. In this tutorial, we’re going… Continue Reading loop-directories
Java String.replaceAll() The method replaceAll() replaces all occurrences of a String in another String. Available Signatures [source,java,gutter:,false] public String replaceAll(String regex, String replacement) Example [source,java,gutter:,true] @Test public void whenCallReplace_thenCorrect() { String s = “I learn Spanish”; assertEquals(“I learn French”, s.replaceAll(“Spanish”, “French”)); }
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Concatenating Text Files into a Single File in Linux 1. Overview Linux provides us commands to perform various operations on files. One such activity is the concatenation – or merging – of files. In this quick tutorial, we’ll see how to concatenate files into a single file. 2. Introducing cat… Continue Reading concatenate-files
Java String.substring() The method substring() comes with two signatures. If we pass the beginIndex and the endIndex to the method, then it obtains a part of a String given the starting index and the length of the result. We can also pass the beginIndex only and obtain the part of… Continue Reading substring
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Java String.startsWith() The method startsWith() is a convenience method that checks whether a String starts with another String. We can also pass the index of the first character to start checking from. Available Signatures [source,java,gutter:,false] public boolean startsWith(String prefix) public boolean startsWith(String prefix, int toffset) Example [source,java,gutter:,true] @Test public void… Continue Reading starts-with
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A Guide to Yum and Apt 1. Overview Package Managers are a great feature of every Linux system. They allow us to easily handle the installation, removal, and inspection of software packages. In this tutorial, we’ll learn how to use two among the most famous ones: YUM and APT. 2.… Continue Reading yum-and-apt
Creating Symbolic and Hard Links with Linux Commands 1. Overview On a Linux machine, we can create links to an existing file. A link in Unix can be thought of as a pointer or a reference to a file. In other words, they’re more of a shortcut to access a… Continue Reading symbolic-and-hard-links
Silencing the Output of a Bash Command 1. Overview In this quick tutorial, we’ll focus on how to silence the output of a Bash command. 2. Prerequisites Before silencing the output, we first need to understand how Bash handles output when executing a command. 2.1. Standard Output & Error When… Continue Reading silencing-bash-output