Commit-editmsg -

COMMIT_EDITMSG is a temporary file Git creates whenever you run git commit without a message (the -m flag). It acts as a workspace for you to draft, edit, and save your commit message before it's officially added to the project history. How it Works

: It invokes your default text editor (e.g., Vim, Nano, VS Code) to open this file. User Input

In Git, COMMIT_EDITMSG is a temporary file located in the .git directory (.git/COMMIT_EDITMSG) that holds the content of the commit message currently being drafted. Core Functionality

#!/bin/sh
MSG_FILE="$1"  # Git passes .git/COMMIT_EDITMSG as $1
if ! head -1 "$MSG_FILE" | grep -qE "^(feat|fix|docs): "; then
    echo "ERROR: Commit message must follow Conventional Commits format"
    exit 1
fi

He remembered the "50/72 rule". Keep the subject line concise. Explain the "why," not just the "what".