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Use Multiple SSH Keys for Git host websites (Github, Gitlab)

This is guide about how to configure multiple SSH keys for some Git host websites such as Github, Gitlab, among others.

Creating SSH keys

1. Create SSH directory:

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SSH authentication agent does not automatically start when using it from a remote server. This results in the following error message:

$ git pull
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
$ ssh-add ~/my-ssh-key.pem
Could not open a connection to your authentication agent.

To fix it requires manually starting ssh-agent:

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// Implementation in ES6
function pagination(c, m) {
    var current = c,
        last = m,
        delta = 2,
        left = current - delta,
        right = current + delta + 1,
        range = [],
        rangeWithDots = [],
        l;

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First of all you need to be able to run MAMP in port 80. This is a "heat check" if you don't have any process jamming http ports. You can check it like this:

sudo lsof | grep LISTEN

If you do happen to have any process with something like this *:http (LISTEN), you are in trouble. Before with adventure check if it isn't MAMP itself (yeah, you should close that beforehand)

ps <pid of that process>

If you don't see MAMP, you are in good hands, I have just the thing for you:

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Installing Yarn in Cloud9

You can't just follow the directions on the site, you have to do some mojo first.

Step 1. Run update.

sudo apt-get update

Step 2. Install apt-transport-https.

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# This is a skeleton for testing models including examples of validations, callbacks,
# scopes, instance & class methods, associations, and more.
# Pick and choose what you want, as all models don't NEED to be tested at this depth.
#
# I'm always eager to hear new tips & suggestions as I'm still new to testing,
# so if you have any, please share!
#
# @kyletcarlson
#
# This skeleton also assumes you're using the following gems: 

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$ brew uninstall postgresql
$ gem uninstall pg # ALL OF THEM
$ rm -fr /usr/local/var/postgres
$ launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
$ pg_ctl -D /usr/local/var/postgres stop -s -m fast # WE SHOULD HAVE ALL postgres SERVERS & PROCESSES STOPPED BY NOW
$ brew install postgres
$ env ARCHFLAGS="-arch x86_64" gem install pg
$ echo "DONE." >> /dev/null

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###Step 1: Install XCode

Check if the full Xcode package is already installed:

$ xcode-select -p

If you see:

/Applications/Xcode.app/Contents/Developer

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###Step 1: Install XCode

Check if the full Xcode package is already installed:

$ xcode-select -p

If you see:

/Applications/Xcode.app/Contents/Developer

choyno

# SSL self signed localhost for rails start to finish, no red warnings. 

# 1) Create your private key (any password will do, we remove it below)

$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key