Command Line Interface

Text-based interface.

Resources

The Linux Command Line for Beginners | Ubuntu
- If you don't know what are cd, ls, and grep, this might be where to start
- Ultimately, learn by trial and error
Command Line Interface Guidelines
- A guide to building command line interfaces, very detailed and informative
- The philosophy of a good CLI and the guidelines to follow when building one
The terminal | furbo.org
- A long list of commands in Unix and Mac

Modern Unix
- A collection of modern alternatives for some classic Unix commands
Explain Shell
- Visually breaking down and explaining a shell command
tldr.sh
- Simplified and community-driven manual

What is the SSH randomart image for?
- There is a "randomart image" from ssh-keygen from the terminal
- Support comparing host keys visually, especially recognizing host keys that have been changed
CLI tools in the Python standard library | Simon Willison (HN)
- Server current directory over HTTP: python -m http.server 8000
- Pretty-print JSON: echo '{"key": "value"}' | python -m json.tool
- tokenize, base64, random, calendar, etc.
What does 2>/dev/null means?
- > means redirect, 2> file means redirect stderr to file, /dev/null is the null device
Entering text in the terminal is complicated | Julia Evans (HN)
- The baseline:
  - No arrows, no history
  - Ctrl+W delete word, Ctrl+U delete line
  - stty -a list what's supported in the terminal
- readline:
  - Up arrow to previous command
  - Ctrl+E or End, Ctrl+A or Home, Ctrl+left/right back/forward 1 word
  - Ctrl+R to search history
  - rlwrap python to wrap a program with readline support
Terminal Colours are Tricky | Julia Evans
- 16 ANSI colours, configuring colours, problem of colours in vim, etc.
"Rules" that terminal programs follow | Julia Evans (HN)
- Ctrl-C, Ctrl-D, Ctrl-W, 16 ANSI colors, - for stdin/stdout
What does "2>&1" mean?
- 2 refers to file descriptor 1 (stdout) and 2 (stderr) redirect (>) to &1 file descriptor 1 (stdout)