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SYS.01CMD_LINE_CMDR
SANDBOX_MODE//Interactive Environment

Practice Terminal

A fully simulated Mac terminal environment. Experiment with commands freely — the filesystem is sandboxed and resets with the [RESET] button. Browse files, create directories, search with grep, and explore just like a real terminal.

INTERACTIVE_TERMINAL//sandbox
Command Line Commander // Interactive Terminal v1.0
Type 'help' for available commands. Tab completion not available in simulator.
Try:
MISSION_BRIEF//Suggested Drills

Things to Practice

Not sure where to start? Work through these drills in the terminal above. Each one targets a real skill you'll use every day on the command line.

  1. 01

    Get your bearings

    Find out who you are, where you are, and what's around you in the filesystem.

    whoamipwdls -lahostname
  2. 02

    Navigate the project tree

    Move into the sample project, look at its structure, then return home.

    cd projects/my-apptreecd ..cd ~
  3. 03

    Read a file

    Inspect the contents of package.json, then peek at just the first or last lines.

    cat projects/my-app/package.jsonhead package.jsontail -n 5 package.json
  4. 04

    Create and clean up

    Make a new folder, drop a file inside, then remove both.

    mkdir -p scratch/notestouch scratch/notes/todo.mdrm -r scratch
  5. 05

    Copy and move

    Duplicate a file under a new name, then rename it somewhere else.

    cp projects/my-app/package.json backup.jsonmv backup.json archive.json
  6. 06

    Search the codebase

    Hunt for TODO comments and find every TSX file in the project.

    grep -rn TODO projects/my-appfind projects/my-app -name '*.tsx'
  7. 07

    Count lines

    Use wc to see how big a file is in lines, words, and bytes.

    wc -l projects/my-app/package.jsonwc projects/my-app/README.md
  8. 08

    Pipe and chain commands

    Combine commands together to filter output — a core CLI superpower.

    ls -la | grep tsxcat package.json | wc -l
  9. 09

    Work with git

    Check repository status, browse history, and list branches.

    git statusgit loggit branch
  10. 10

    Read the manual

    Every real CLI user knows how to look things up. Open the manual for ls.

    man lshelpwhich grep
  11. 11

    Recall past commands

    Use history and the Up arrow to replay what you've already typed.

    history↑ (arrow up)
  12. 12

    Inspect the environment

    List environment variables, then set and read your own.

    envexport GREETING=helloecho $GREETING

Navigate

cd <dir>ls -lapwdtree

Files

cat <file>touch <file>mkdir -p <dir>rm <file>

Search

grep -rn <pat> .find . -name '*'wc -l <file>

Tools

git statusnpm run devman <cmd>history