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Install steam locomotive sl using apt

sl or steam locomotive is a commandline application that displays steam locomotive "train" animations aimed to correct users who accidentally enter sl instead of ls.  initials sl stands for Steam Locomotive How to install ls or steam locomotive Assuming you've root privileges and installed apt package manager on your system Type sudo apt-get update sudo apt-get upgrade sudo apt-get install sl To test installation type sl If installation was successful You'll see an ASCII image of a train right in your terminal after few seconds it will stop
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Tar basic commands to store and extract files

Targeted is an archiving program designed to package, store, and compress multiple files into a single portable package the name tar is an abbreviation for tape archiver Apart from creating .tar archives tar is also capable of compressing files using zip, bzip2, and gzip compression algorithms Tar flags c — compress directive x — extract directive t — tabulate contents f — specify filename z — use zip/gzip compression j — use bzip2 compression k — do not overwrite t — files from file w — ask for configuration v — verbose gzip flags d — decompress file Tar commandline commands syntax tar -{arguments} {params} Example tar commands tar -cf music.tar music.mp3 Tar archiver will be directed to compress music.mp3 into a tar archive named music.tar and save it in the current working directory tar -xf music.tar Tar will be directed to extract music.tar archive and save the constituent contents of the archive...
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JavaScript es6 template literals

Template literals are a new syntax to create strings in JavaScript Embedding expressions in a string is now possible using template literals thus there's a new way to embed expressions into strings effectively interpolating the values done using syntax ${expression} within a string for instance const text = 'Hello world' const string = `Say ${text}` // Say hello world. You're not only limited to that you can as well perform more advanced expressions and arithmetics as well const string = `${1 + 2}` // returns 3 strings that spawn more than one line are now possible with template literals initially the only way to create strings that spawn multiple lines was to break it up in parts the syntax below is now possible const text = ` loading.... processing...`
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How to wait for a promise within a loop block

JavaScript promises enable developers to write asynchronous applications in JavaScript Loops are ways of iterating elements For instance doing an asynchronous task within a for loop can be done as follows; Note that lag is used to emulate some delay. const items = [1, 2, 3, 4] const lag = async (delay) => {     return new Promise((resolve) =>         setTimeout(() => res(`${delay / 1000} sec`), delay)) } items.forEach(async (item) => {     const seconds = await lag(1000 * item)     console.log(seconds) }) expected output 1 sec 2 sec 3 sec 4 sec After running the code above every second some text was printed
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How to strip out html using regular expression in JavaScript

Regular expression isn't a very viable solution for manipulating html due to the complexity of html syntax in the browser it's recommended to create dom elements, appending html source code and then manipulating it using built-in dom querySelectors that has few drawbacks especially for environments without a dom take for instance nodejs You can use regular expression replace function as; const str = "<b>John swana</b>" str.replace(/(<([^>]+)>)/ig, "") // John swana And that's it
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