jeremyjs

Intro to Meteor.js

What is Meteor.js?

• CLI tool (meteor)
• Library of packages
• Open source
• Built on Node.js

Why Meteor?

• Seven Principals of Meteor

jeremyjs

task :add_submodule, [:a0, :a1] do |t, args|
  install_path = "janus/#{args[:a1]}"
  puts "*installing #{args[:a0]} to #{install_path}"
  `git submodule add #{args[:a0]} #{install_path}`
end

jeremyjs

# change to the 'myfolder' directory within the current directory
$ cd myfolder/
$ cd ./myfolder
$ cd myfolder
$ cd ../myfolder_parent/myfolder

# change to the 'usr' directory within the root directory
$ cd /usr/
$ cd /usr

jeremyjs

# view environment variables
$ printenv
PATH=/usr/local/heroku/bin:/usr/local/heroku/bin:/Users/jmeyer1/.rbenv/bin:/Users/jmeyer1/code/8b/bin:/Users/jmeyer1/.rbenv/shims:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
TMPDIR=/var/folders/wz/v_ty7wz108v3tz90gg627nt40000gp/T/
SHELL=/bin/zsh
HOME=/Users/jmeyer1
USER=jmeyer1
LOGNAME=jmeyer1
SSH_AUTH_SOCK=/tmp/launch-E2mZnk/Listeners
Apple_PubSub_Socket_Render=/tmp/launch-GhVrOe/Render

jeremyjs

$ touch jmeyer.txt
$ scp jmeyer.txt [email protected]:/tmp
The authenticity of host 'vor.dev.cashnetusa.com (10.10.212.130)' can't be established.
RSA key fingerprint is 12:05:3d:8c:37:bf:a6:97:4e:e4:d8:ee:33:d1:19:15.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'vor.dev.cashnetusa.com,10.10.212.130' (RSA) to the list of known hosts.
[email protected]'s password:
jmeyer.txt                                                                                                                                                                100%    0     0.0KB/s   00:00

$ rm jmeyer.txt

jeremyjs

# Create file
$ touch /tmp/file.tmp
$ l /tmp/file.tmp
-rw-r--r--  1 jmeyer1  wheel     0B Jun 16 15:59 /tmp/file.tmp

# Change owner to root
$ sudo chown root /tmp/file.tmp
$ l /tmp/file.tmp
-rw-r--r--  1 root  wheel     0B Jun 16 15:59 /tmp/file.tmp

jeremyjs

# why is sudo necessary?
to run commands that affect the entire system, or exist outside of any
particular user's home directory

# why is sudo dangerous?
Using sudo, it's possible to delete vital files, directories, or even your
entire system. e.g. "sudo rm -rf /" Don't try this at home. Essentially any
command which is non-reversible is potentially dangerous.

jeremyjs

# check current free space
$ df -h
Filesystem      Size   Used  Avail Capacity  iused    ifree %iused  Mounted on
/dev/disk0s2   233Gi   74Gi  158Gi    32% 19571865 41464807   32%   /
devfs          221Ki  221Ki    0Bi   100%      767        0  100%   /dev
map -hosts       0Bi    0Bi    0Bi   100%        0        0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%        0        0  100%   /home
/dev/disk1s2   8.0Mi  1.9Mi  6.1Mi    24%      481     1557   24%   /Volumes/Adobe Reader Installer
/dev/disk2s2   3.7Mi  1.9Mi  1.9Mi    50%      477      480   50%   /Volumes/SDL
/dev/disk3s2    11Mi  7.8Mi  2.9Mi    74%     1993      730   73%   /Volumes/SDL2_mixer

jeremyjs

$ ruby -e 'sleep 1 while true' &
[1] 80604

$ fg %1
[1]  + 80604 running    ruby -e 'sleep 1 while true'
^Z
[1]  + 80604 suspended  ruby -e 'sleep 1 while true'

$ ps
  PID TTY           TIME CMD

jeremyjs

# replace characters in a string
s = "string"
puts s.tr('i', 'o')
puts s.tr('string', 'Heroku')
puts s.tr_s('ri', 'u')