CLI Whirlwind Tour Part 2

class: center, middle

# The command line
A whirlwind tour of useful command-line tools and features that I use

---

# Why the command line?

* All developers have to use it

* Might as well be productive in it

* Reproducibility is a breeze in the terminal

* It can be fun (no, really)

???

There will be some repeats from part 1, but only those that I still find useful

---

# fzf
**Description**: A general-purpose interactive fuzzy text finder

**Good for**: A **way better** reverse search for your shell

**How to use**: Press `ctrl` + `r` from your shell

**How to install**: `brew install fzf && $(brew --prefix)/opt/fzf/install`
([link](https://github.com/junegunn/fzf#using-homebrew-or-linuxbrew))

**See also**: [fzf.vim](https://github.com/junegunn/fzf.vim), if you're into
that sort of thing, [zsh unlimited
history](https://unix.stackexchange.com/a/273929)

---

# Shell line navigation
**Description**: Shortcuts to more easily manipulate the current line

**Good for**: Making (more) precision edits

**How to use**:
* `ctrl` + `a` (go to beginning of line)
* `ctrl` + `e` (go to end of line)
* `ctrl` + `w` (delete previous word)
* `ctrl` + `u` (delete entire line)

**How to install**: Built-in to the shell

**See also**: [zsh
shortcuts](https://cheatography.com/davidsouther/cheat-sheets/bash-zsh-shourtcuts/),
[iTerm Natural Text Editing](https://apple.stackexchange.com/a/218639)

```sh
# Modify zsh's word split regex so that we can erase just one part of a
# directory. Eg: erasing ~/dotfiles/zsh takes three ctrl+w motions, instead of
# just one.
WORDCHARS=$WORDCHARS:s:/:
```

---

# pbcopy/pbpaste
**Description**: Commands that copy or paste from the system clipboard

**Good for**: If you're too lazy to use a mouse

**How to use**:
* `echo hello | pbcopy`
* `pbpaste > contents.txt`

**How to install**: Already installed on a mac.

**See also**: [xclip](https://opensource.com/article/19/7/xclip) (the linux
equivalent)

---

# tmux
**Description**: A terminal multiplexer

**Good for**: Managing multiple shell instances

**How to use**: `tmux` // `tmux attach`

**How to install**: `brew install tmux`

**See also**: [A Quick and Easy Guide to
tmux](https://www.hamvocke.com/blog/a-quick-and-easy-guide-to-tmux/),
alternatively, [iTerm Window
Arrangements](https://webstudiya.com/develop-faster-with-iterm-profiles-and-window-arrangements/)

---

# Spectacle app, Yabai
**Description**: Programs for X window management

**Good for**: Tiling graphical programs like you do your terminal ones

**How to use**: Focus a window and use the tiling window shortcuts

**How to install**: Download from [spectacleapp.com](https://spectacleapp.com), or
follow the [Yabai README](https://github.com/koekeishiya/yabai).

**See also**: [Yabai demo](https://www.youtube.com/watch?v=AdwhjIg_Xe4)

???

Okay, so these aren't command line tools, but they are general purpose
productivity tools.

---

# git flags
**Description**: Optional flags to pass to git commands

**Good for**: Finer control over git

**How to use**:
* `git [add/reset] -p`
* `git branch -vva`
* `git revert --no-commit`
* `git diff --cached`
* `git commit --verbose`

**How to install**: Installed alongside `git`

**See also**: [useful git
aliases](https://www.durdn.com/blog/2012/11/22/must-have-git-aliases-advanced-examples/)

---

# shell aliases
**Description**: Built-in shell functions or commands

**Good for**: Automating or shortening commands, without creating an external
script

**How to use**:
* `alias`
* `alias frb=cd ~/code/work/frb`
* `alias gs=git status`

**How to install**: Built-in to the shell

**See also**: [zsh-z](https://github.com/agkozak/zsh-z)

---

# curl/httpie
**Description**: Make HTTP requests against a webpage

**Good for**: Working with APIs

**How to use**: `curl ipinfo.io` // `http ipinfo.io`

**How to install**: `curl` already installed, `brew install httpie`. Can also
be `pip install`ed

**See also**: [httpie cheatsheet](https://devhints.io/httpie), [curl
cheatsheet](https://devhints.io/curl)

---

# jq
**Description**: General purpose JSON processor

**Good for**: Filtering/sifting through JSON payloads

**How to use**:
* `cat response.json | jq`
* `cat response.json | jq '.stores[].name'`

**How to install**: `brew install jq`

**See also**: [jq tutorial](https://stedolan.github.io/jq/tutorial/)

---

# visidata
**Description**: Interactive utility for exploring data in a tabular form.

**Good for**: **Understanding the structure of JSON payloads**. Quick analysis of
csv and json files. Also works with postgres databases, sqlite, and urls (say
whaaat?). ALSO MAP PLOTTING!

**How to use**:
* `vd employees.csv`
* `cat stores.json | vd -f json`

**How to install**: `brew install visidata`

**See also**:  [Lightning demo](https://www.youtube.com/watch?v=N1CBDTgGtOU),
[An Introduction to
VisiData](https://jsvine.github.io/intro-to-visidata/index.html)

---

# ag
**Description**: Replacement for `grep`

**Good for**: Finding text in files or folders

**How to use**:
* `ag searchstring`
* `cat largeFile.js | ag -w WORD_HERE`

**How to install**: `brew install the_silver_searcher`

**See also**: [ag](https://github.com/ggreer/the_silver_searcher),
[ripgrep](https://github.com/BurntSushi/ripgrep),
[the_platinum_searcher](https://github.com/monochromegane/the_platinum_searcher)

---

# fd
**Description**: Replacement for `find`

**Good for**: Finding files of a certain name or type

**How to use**:
* `fd test`
* `fd -p test`
* `fd -e json`

**How to install**: `brew install fd`

**See also**: [github.com/sharkdp/fd](https://github.com/sharkdp/fd)

---

# redirects, pipes, here strings, special files

**Description**: The way in which the shell handles program interactions

**Good for**: Chaining commands together, or saving output to a file

**How to use**:
* `>`
* `<`
* `|`
* `<<<`
* `/dev/std{in,out,err}` (0, 1, 2)
* `/dev/null`
* `mkfifo`

**How to install**: Built-in to the shell

**See also**: [everything is a
file](https://www.howtogeek.com/117939/htg-explains-what-everything-is-a-file-means-on-linux/),
[tee command](https://www.geeksforgeeks.org/tee-command-linux-example)

---

# PostgreSQL
**Description**: General purpose relational database

**Good for**: Applications whose data is structured in nature

**How to use**:
* `createdb`/`dropdb` to create/drop database
* `psql` to connect to a database
* `pg_dump` to create a backup

**How to install**: `brew install postgres`

**See also**: [learn SQL in 5
mins](https://towardsdatascience.com/learn-beginner-sql-in-5-steps-in-5-minutes-c44c47fa39a1), [pgcli](https://www.pgcli.com/), [using JSON in
Postgres](https://rollout.io/blog/unleash-the-power-of-storing-json-in-postgres/)

---

# redis-cli / redis-server
**Description**: key:value store used as a lightweight database/cache/message
broker

**Good for**: Exactly that

**How to use**:
* `redis-cli`
* `redis-cli keys "*"`
* `redis-cli -h test-redis.com`

**How to install**: `brew install redis`

**See also**: [redis quickstart](https://redis.io/topics/quickstart)

---

# brew services
**Description**: List brew-managed background services

**Good for**: Automatically starting/stopping Redis, Postgres, Docker, etc...

**How to use**:
* `brew services`
* `brew services [start,stop] redis`

**How to install**: ~~brew install~~ kidding, it's installed with `brew`

**See also**:

---

# serve
**Description**: Host static files/directories as a website

**Good for**: Mimicking backend servers with files, hosting front-end apps
locally, testing ssl certificates

**How to use**: `serve .`

**How to install**: `npm install serve`

**See also**: `serve --help`, [mockserver](https://www.mock-server.com/),
`python3 -m http.server`

---

# bat
**Description**: A drop-in replacement for `cat`, with extra eye candy

**Good for**: Grokking a file without using a heavy editor to do so

**How to use**: `bat NAME_OF_FILE`

**How to install**: `brew install bat`

**See also**:

---

# pup
**Description**: Parse/prettify html from the command line

**Good for**: Making sense of hard-to-read HTML

**How to use**: `curl some-website.com | pup --color`

**How to install**: `brew install pup`

**See also**: [pup usage](https://github.com/ericchiang/pup#examples)

---

# Just for fun

```console
$ pipes.sh
$ cmatrix
$ telnet towel.blinkenlights.nl
```

**Description**: The CLI isn't just for serious business

**Good for**: ???

**How to use**:

**How to install**: `brew install pipes-sh`, `brew install cmatrix`

**See also**:
[github.com/ligurio/awesome-ttygames](https://github.com/ligurio/awesome-ttygames),
[sl](https://github.com/mtoyoda/sl), [gti](https://r-wos.org/hacks/gti)