entr

Run arbitrary commands when files change. Useful for watching files and triggering builds or tests.

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Last updated: April 29, 2026

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entr (Event Notify Test Runner)

A utility for running arbitrary commands when files change.

Usage

entr

takes a list of filenames from standard input and executes the utility specified as the first argument.

Syntax

<file_listing_command> | entr <utility> [arguments]

Options

```
-c
```
: Clear the screen before invoking the utility.
```
-r
```
: Reload a persistent child process (e.g., a server).
```
-s
```
: Evaluate the first argument using the interpreter specified by
```
SHELL
```
.

Examples

Rebuild project when sources change:

find src/ -name "*.c" | entr make

Run tests when JS files change:

git ls-files | grep '\.js$' | entr npm test

Auto-reload a Node server:

ls *.js | entr -r node app.js

Agent Notes

entr

blocks the terminal. When using it as an agent:

Use
```
process
```
tool to run it in the background if you need to do other things.
Or use it for a quick "watch mode" session where you intend to monitor output for a while.

entr

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Quick Start

Manual Installation

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Tags

using-git-worktrees

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entr (Event Notify Test Runner)

Usage

Syntax

Options

Examples

Agent Notes

finishing-a-development-branch

test-driven-development

requesting-code-review

receiving-code-review

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