what-is-installed

A small shell tool that shows what command-line tools are actually available in your $PATH.

Features

• Dynamically scans all directories in $PATH — no hardcoded list, no assumptions
• Shows version info for every discovered command
• Deduplicates: same command name only checked once; same file only shown once
• Zero external dependencies

Usage

./bin/what-is-installed

Example Output

已发现的命令
python3.11         3.11.15        /Users/you/.local/bin/python3.11
uv                 0.11.8         /Users/you/.local/bin/uv
brew               5.1.5          /opt/homebrew/bin/brew
gh                 2.89.0         /opt/homebrew/bin/gh
docker             29.3.1         /usr/local/bin/docker
node               24.14.0        /usr/local/bin/node
npm                11.9.0         /usr/local/bin/npm
cat                无             /bin/cat

How it works

1. Reads your $PATH environment variable
2. For each directory, finds all executable files
3. Tries --version (or -V as fallback) on each command
4. Extracts the version number; shows "无" if unavailable
5. Caches results: same command name only checked once

License

MIT