Execute ES Modules on the CLI

Jonathan Neal shared this little snippet on Twitter: Execute JavaScript modules like: bash ./command.js 1. Add the funky header.2. Optional: Omit the extension to not write `.js`.3. Optional: `chmod +x command` to not write `bash `.https://t.co/rhlPg2XPRJ pic.twitter.com/nbAvTFtt0w — Jonathan Neal (@jon_neal) July 25, 2021 Here’s the code: “:” //#;exec /usr/bin/env node –input-type=module – “$@” < …

Automatically Generate Regular Expressions from User Input with grex

grex is a library as well as a command-line utility that is meant to simplify the often complicated and tedious task of creating regular expressions. It does so by automatically generating a single regular expression from user-provided test cases. The resulting expression is guaranteed to match the test cases which it was generated from. As …

Mirror Displays — A Mac app and command-line tool for fiddling with display mirroring

MirrorDisplays a simple application that toggles between mirrored and extended desktop modes. It’s the easiest way to turn on, or turn off display mirroring. Also comes with a (separately installable) CLI tool which makes this pretty interesting The command line tool is good for giving shell-scripts the power to control display mirroring and opens up …

Send mail with Exim from the CLI

I needed to test whether mail relaying worked with Exim or not. To do so I used this command: exim -v recipient@example.com After this type in your mail contents as shown below and hit CTRL+D afterwards to send it: From:sender@example.com Subject: Hello From the CLI This is a test from the CLI It’s also possible …

Beware when base64-encoding on the CLI using echo

Recently I needed to base64-encode a string. To do this I turned to the CLI and piped the output of echo to base64. # Don’t use! Correct command further down this post. $ echo ‘test’ | base64 dGVzdAo= Although the output looks quite good, things didn’t quite work out when using the string: it failed …

bandwhich – Terminal bandwidth utilization tool

bandwhich sniffs a given network interface and records IP packet size, cross referencing it with the /proc filesystem on linux or lsof on macOS. It is responsive to the terminal window size, displaying less info if there is no room for it. It will also attempt to resolve ips to their host name in the …

Open your React Native’s Xcode project file from the CLI with xed

For a long time I always used the open command to open the Xcode project file contained inside React Native Projects. bramus in ~/repos/projects/react-native/example $ open ios/Example.xcodeproj It wasn’t until I recently started a new React Native project that react-native init afterwards informed me to use xed instead. The xed tool launches the Xcode application …

Bash/Shell Autocompletion for Composer

The other day I opened up a PHP project that I hadn’t worked on in a while. No longer remembering which Composer Scripts I had defined for it, I needed to take a peek inside composer.json to see which ones were available to me. Then it hit me: why is there no autocompletion for composer …