$ brew install awscli bash coreutils emacs htop jq node pandoc pari \
  pkg-config pup pyenv python3 r shellcheck tcpflow the_silver_searcher tmux tree

$ pip3 install pycodestyle pylint virtualenv mypy

$ brew install 1password adobe-creative-cloud affinity-publisher \
  google-chrome java microsoft-office rstudio slack sync

$ brew install --cask docker emacs

$ sudo apt-get install -y awscli curl emacs gcc gdb git htop jq make nodejs npm \
  openjdk-17-jdk openssl pari-gp pkg-config python3.8-dev ruby shellcheck silversearcher-ag \
  ssh strace tcpflow tmux tree

$ pip3 install pycodestyle pylint virtualenv mypy

$ sudo apt-get install -y chromium-browser
$ sudo apt-get remove -y openoffice*.* thunderbird unity-webapps-common libreoffice* \
  software-center rhythmbox totem ubuntu-software

$ sudo apt-get install -y elasticsearch mariadb-server mongodb-server postgresql redis-server

$ cat ls-home.m4
#!/bin/sh
cd HOME && ls

$ m4 -DHOME=$HOME ls-home.m4 > ls-home

$ chmod +x ls-home

$ sed s/HOME/$HOME/ < ls-home.m4

$ cat ls-home.m4
#!/bin/sh
echo `HOME' is HOME
cd HOME && ls

$ m4 -DHOME=$HOME ls-home.m4 > ls-home

$ chmod +x ls-home

``foo''

`foo'

`foo'changequote(`[',`]')`changequote([`],['])

foo`

$ cat ls-clark.m4
#!/bin/sh
define(`dir', `/Users/clark')
ls dir

$ m4 ls-clark.m4 > ls-clark
$ chmod +x ls-clark
$ ./ls-clark

$ yes | head -16000000 | awk '{print rand()}' > rand.txt

$ for i in $(seq 0 15); do yes | head -1000000 | awk '{print rand()}' > rand.$i.txt & ; done

$ while read line; do echo $line & ; done < /etc/passwd

$ seq 11 20 | xargs -n 1 -P 3 sleep

$ echo foo bar baz | xargs -n 1 -I {} echo wombat {} wumpus
wombat foo wumpus
wombat bar wumpus
wombat baz wumpus

$ echo foo bar baz | xargs -I {} echo wombat {} wumpus
wombat foo bar baz wumpus

$ echo $'foo\nbar\nbaz' | parallel echo wombat {} wumpus
wombat foo wumpus
wombat bar wumpus
wombat baz wumpus

$ echo $'foo\nbar\nbaz' | parallel -n 3 echo wombat {} wumpus
wombat foo bar baz wumpus

$ yes | pv | cat > /dev/null

$ rlwrap ocaml
$ rlwrap racket
$ rlwrap sbcl

$ screenfetch
                 -/+:.          clark@ClarkMac
                :++++.          OS: 64bit Mac OS X 10.12.5 16F73
               /+++/.           Kernel: x86_64 Darwin 16.6.0
       .:-::- .+/:-``.::-       Uptime: 22d 19h 21m
    .:/++++++/::::/++++++/:`    Packages: 217
  .:///////////////////////:`   Shell: zsh 5.2
  ////////////////////////`     Resolution: 2880x1800
 -+++++++++++++++++++++++`      DE: Aqua
 /++++++++++++++++++++++/       WM: Quartz Compositor
 /sssssssssssssssssssssss.      WM Theme: Blue
 :ssssssssssssssssssssssss-     Font: SFMono-Regular
  osssssssssssssssssssssssso/`  CPU: Intel Core i7-6920HQ @ 2.90GHz
  `syyyyyyyyyyyyyyyyyyyyyyyy+`  GPU: AMD Radeon Pro 460 / Intel HD Graphics 530
   `ossssssssssssssssssssss/    RAM: 10092MiB / 16384MiB
     :ooooooooooooooooooo+.
      `:+oo+/:-..-:/+o+/-

$ screenfetch
                          ./+o+-       clark@ubuntu
                  yyyyy- -yyyyyy+      OS: Ubuntu 16.04 xenial
               ://+//////-yyyyyyo      Kernel: x86_64 Linux 4.8.0-51-generic
           .++ .:/++++++/-.+sss/`      Uptime: 13d 14h 51m
         .:++o:  /++++++++/:--:/-      Packages: 1855
        o:+o+:++.`..```.-/oo+++++/     Shell: bash 4.3.48
       .:+o:+o/.          `+sssoo+/    Resolution: 1680x1050
  .++/+:+oo+o:`             /sssooo.   DE: Unity 7.4.0
 /+++//+:`oo+o               /::--:.   WM: Compiz
 \+/+o+++`o++o               ++////.   WM Theme: Ambiance
  .++.o+++oo+:`             /dddhhh.   GTK Theme: Ambiance [GTK2/3]
       .+.o+oo:.          `oddhhhh+    Icon Theme: ubuntu-mono-dark
        \+.++o+o``-````.:ohdhhhhh+     Font: Ubuntu 11
         `:o+++ `ohhhhhhhhyo++os:      CPU: 2x Intel Core i7-6920HQ CPU @ 2.903GHz
           .o:`.syhhhhhhh/.oo++o`      RAM: 2316MiB / 3932MiB
               /osyyyyyyo++ooo+++/
                   ````` +oo+++o\:
                          `oo++.

$ tree -I '*.pyc' -H $(pwd) . > ~/python_file.html

$ tree --help
  ------- Listing options -------
  -d            List directories only.
  -l            Follow symbolic links like directories.
  -f            Print the full path prefix for each file.
  -x            Stay on current filesystem only.
  -L level      Descend only level directories deep.
  -I pattern    Do not list files that match the given pattern.
  -------- File options ---------
  -p            Print the protections for each file.
  -u            Displays file owner or UID number.
  -g            Displays file group owner or GID number.
  -s            Print the size in bytes of each file.
  -h            Print the size in a more human readable way.
  -D            Print the date of last modification or (-c) status change.
  -F            Appends '/', '=', '*', '@', '|' or '>' as per ls -F.
  --inodes      Print inode number of each file.
  --device      Print device ID number to which each file belongs.
  ------- Sorting options -------
  -t            Sort files by last modification time.
  -r            Reverse the order of the sort.
  ------- Graphics options ------
  -i            Don't print indentation lines.
  ------- XML/HTML/JSON options -------
  -X            Prints out an XML representation of the tree.
  -J            Prints out an JSON representation of the tree.
  -H baseHREF   Prints out HTML format with baseHREF as top directory.

$ sed 's/root/ROOT/' < /etc/passwd > /tmp/passwd
$ colordiff /etc/passwd /tmp/passwd

$ find . -name '*.[ch]' | gtags -f -
$ global -x main
$ global -xr main

$ gcc -o test test.c $(pkg-config --libs --cflags libpng)

$ npm install -g grunt
$ npm install -g gulp

$ pyenv install --list

$ pyenv install 3.7.7

$ virtualenv --python=/Users/clark/.pyenv/versions/3.7.7/bin/python ve

$ . ve/bin/activate

$ pip install click pytest requests

$ pip freeze > requirements.txt

$ pip install -r requirements.txt

$ pycodestyle foo.py

$ pylint foo.py

$ mypy --disallow-untyped-defs foo.py

$ shellcheck foo.sh

#!/usr/bin/env bash

$ gcc -g -o foo foo.c

$ gdb CMD
$ gdb CMD PID
$ gdb CMD CORE

$ strace ls
$ strace -p 7191
$ strace -f
$ strace -s120

$ strace -ttt
$ strace -T

$ strace -C ls
$ strace -c ls

$ dwebp foo.webp -o foo.png

$ asciidoc foo.txt

$ echo 'Four score and seven yeers ago' > /tmp/gettysburg.txt
$ aspell -c /tmp/gettysburg.txt

$ echo 'Four score and seven yeers ago' | aspell list
yeers

$ echo 'Four score and seven yeers ago' | aspell -a
*
*
*
*
& yeers 85 21: years, yews, yes, year's, yew's, yeas, beers, jeers, leers, peers, seers, veers, yea's, yeahs, yes's, yours, eyes, yeses, Meyers, tees, Ayers, Byers, Myers, dyers, eye's, yaws, yer, queers, yrs, Yeats, yearns, beer's, deer's, jeer's, leer's, peer's, seer's, tee's, veer's, seer, yaw's, yeah's, year, yens, yeps, Yves, bees, ears, fees, gees, hers, lees, pees, sees, wees, yous, cheers, sheers, yeggs, yells, yen's, yep's, yetis, Lee's, bee's, fee's, lee's, pee's, see's, wee's, Meyer's, you's, Dyer's, Yeager's, dyer's, yore's, Er's, queer's, Meier's, ear's, her's, Cheer's, cheer's, sheer's, yegg's

$ echo '* foo' | markdown
<ul>
<li>foo</li>
</ul>

$ echo '* foo' | pandoc
<ul>
<li>foo</li>
</ul>

$ echo '* foo' | pandoc -o output.pdf

$ cat > foo.1.md
% FOO(1) Foo User Manual
% John Smith
% November 8, 2012

# NAME

foo - a command line tool

# SYNOPSIS

foo [*file*]...

# DESCRIPTION

Foo performs an operation on files specified on the command line.  If no files
are specified the operation is performed on *stdin*.

# SEE ALSO

`bar` (1).

$ pandoc -s -w man foo.1.md -o foo.1

$ cat > gnomes.txt
# Business Plan

* collect underpants
* ?
* profit

# Phase 1: Collect Underpants

3:30 AM is the optimal time.

# Phase 2: ?

Details TBD

# Phase 3: Profit

Financial results will be discussed in the earnings call.

$ pandoc gnomes.txt -s --webtex -i -t slidy -o gnomes.html

$ qpdf --help

$ qpdf --stream-data=uncompress input.pdf output.pdf

$ qpdf --linearize input.pdf output.pdf

$ pdftotext foo.pdf foo.txt

$ gp

$ echo '1 + 1' | gp -q
2

curl -A USER_AGENT
curl -b COOKIE_NAME=DATA
curl -c COOKIE_JAR_FILE
curl -d KEY=VALUE [-d KEY=VALUE ...]
curl -d @DATA_FILE
curl -D HEADER_DUMP_FILE
curl -e REFERER
curl -F FORM_KEY=VALUE
curl -F FORM_KEY=@FILE
curl -G      (send data as GET)
curl -H HEADER [-H HEADER ...]
curl -i      (put HTTP header in output)
curl -I       (HEAD request)
curl -K CONFIG_FILE
curl -l      (follow redirect)
curl --limit-rate BPS
curl -o OUTPUT_FILE
curl -O      (name local file after path of remote file)
curl -s      (no progress bar or error messages)
curl -sS     (no progress bar, but error messages are shown)
curl -T FILE  (use PUT to upload FILE)
curl -u USER:PASSWORD

$ curl http://google.com | pup body

$ sudo tcpdump [-i INTERFACES] -w dump.pcap [PCAP_FILTER]
$ tcpdump [-v|-A] -r dump.pcap

tcp|udp|icmp
[dst|src] host IP_ADDRESS
[dst|src] port PORT
not PRED
PRED and PRED
PRED or PRED
( PRED )

$ tcpflow [-r PCAP_FILE | -i INTERFACE] [-o DIR] [-a]

SRC_IP_ADDRESS.PORT-DST_IP_ADDRESS.PORT

$ w3m http://google.com

$ curl https://www.google.com > google.html
$ w3m -dump google.html

$ aws configure

$ aws s3 cp --recursive s3://MY_BUCKET/images/ .

$ aws help
$ aws s3 help
$ aws s3 cp help

$ cat example.json
{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": "",
    "branch": "master"
  },
  "builders": [{
    "type": "amazon-ebs",
    "access_key": "{{user `aws_access_key`}}",
    "secret_key": "{{user `aws_secret_key`}}",
    "region": "us-west-2",
    "source_ami": "ami-efd0428f",
    "instance_type": "t2.micro",
    "ssh_username": "ubuntu",
    "ami_name": "ubuntu.16.04 python3.5 openmail {{timestamp}}"
  }],
  "provisioners": [{
    "type": "shell",
    "inline": [
      "sleep 30",
      "cat /etc/*elease",
      "sudo apt-get update",
      "sudo apt-get install -y gcc g++ git make python3.5-dev virtualenv",
      "ssh-keyscan github.com >> ~/.ssh/known_hosts",
      "mkdir ~/.aws",
      "echo '[default]' > ~/.aws/credentials",
      "echo 'aws_access_key_id = {{user `aws_access_key`}}' >> ~/.aws/credentials",
      "echo 'aws_secret_access_key = {{user `aws_secret_key`}}' >> ~/.aws/credentials",
      "git clone git@github.com:THE_USER/THE_PROJECT.git",
      "cd THE_PROJECT",
      "git checkout {{user `branch`}}",
      "virtualenv -p python3.5 ../ve",
      ". ../ve/bin/activate",
      "pip install -r /tmp/requirements.txt",
      "make -k test"
    ]
  }]
}

$ packer validate example.json

$ packer build --var 'aws_access_key=YOUR ACCESS KEY' \
  -var 'aws_secret_key=YOUR SECRET KEY' \
  example.json

pssh -i -A -H joe@host1 -H joe@host2 echo "hello world"

$ nohup sleep 1000 &

$ sleep 1000 &
[1]  + running    sleep 1000
$ disown %1

$ tmux

$ tmux attach

$ gpg2 --generate-key
$ gpg2 --list-keys

$ cp /etc/passwd passwd.txt
$ gpg2 --clear-sign passwd.txt
$ gpg2 --verify passwd.txt.asc

$ openssl dgst -sha256 < /etc/passwd
$ openssl base64 < /bin/ls

$ tar xf linux-3.17.1.tar.xz
$ find linux-3.17.1 -name '*.[ch]' | xargs cat > /tmp/big.txt
$ wc -c /tmp/big.txt
 482314125 /tmp/big.txt
$ time gzip /tmp/big.txt
gzip /tmp/big.txt  15.19s user 0.19s system 99% cpu 15.425 total
$ wc -c /tmp/big.txt.gz
 105127193 /tmp/big.txt.gz
$ time gunzip /tmp/big.txt.gz
gunzip /tmp/big.txt.gz  1.45s user 0.23s system 98% cpu 1.701 total

$ brew tap dart-lang/dart
$ brew install cabal-install coq dart elixir erlang gforth ghc gnu-apl go groovy guile idris kotlin leiningen \
  lua maxima ocaml opam racket rust sbcl sbt scala scalastyle swi-prolog typescript

$ brew tap caskroom/cask
$ brew cask install pharo sage