14.7.2021 |

entr - Event Notify Test Runner

Entr is a useful command-line tool that allows you to run arbitrary commands when files change.

For example, if you develop a Go application, you have to restart the go run command every time you make changes, as Go does not have a "development server".

You can make your life easier by using entr with the -r flag to restart the Go server on file changes:

ls *.go | entr -r go run ./

The entr Man Page also contains more examples, e.g.:

Rebuild a project if source files change, limiting output to the first 20 lines:

$ find src/ | entr sh -c 'make | head -n 20'

Installation

On MacOs you can install the tool with Homebrew:

brew install entr
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