entr

name	entr
description	Use this skill when the user wants to run commands when files change.

Entr Plugin

Run arbitrary commands when files change. A high-performance file watcher for automation.

Commands

File Watching

• entr run watch — Run command when files change

Usage Examples

• "find src/ | entr -s 'make | head -n 20'"
• "ls *.js | entr -r node app.js"
• "echo my.sql | entr -cp psql -f /_"

Installation

brew install entr

Examples

# Rebuild project when source files change
find src/ | entr make

# Auto-reload a node.js server
ls *.js | entr -r node app.js

# Clear screen and run command after SQL update
echo my.sql | entr -cp psql -f /_

# Watch directory for file additions
while sleep 0.1; do ls src/*.rb | entr -d make; done

Key Features

• High-performance file system monitoring
• Receives file list from stdin
• Supports restart mode for long-running processes
• Clear screen option for clean output
• Directory watching for new files
• Shell command execution with flags