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CAPP Development Module

Workflow Speedups

Review of Basic Commands

Common Programs/Functions

Bash Scripting & Common Operators

Paths

Remote Shells & APIs

Virtual Python Environments

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Tonight’s demo repo:

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https://github.com/justincohler/capp_dev_module

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Speed up your workflow

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  • Tab-to-complete
  • Line endings: ctrl-a, ctrl-e
  • Home (~)
  • Wildcards (*)
  • Last command (!!)

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Practice incorporating during the lab!

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Getting around via CLI

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  • ls <path> -- list directory
  • pwd -- present working directory
  • cd <path> -- change directory
  • cp <from> <to> -- copy file/folder
  • mv <from> <to> -- move/rename
  • mkdir <name> -- make directory

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Common Functions

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  • Viewing files: head, tail, cat
  • Writing/Appending: >, >>
  • Creating empty file: touch
  • Method chaining: |
  • Killing hung processes: kill

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Bash Scripting

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  • Script heading:
    • #!/bin/bash
  • Variables:
    • MY_VAR=123
  • If/Else Statements: if [case]; then/fi
  • Loops: for/done for <case>; do/done

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Paths

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  • Exporting variables
  • The main “PATH” variable
  • Bash Profiles
  • /tmp, /opt, and /usr/local

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SSH Configuration

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What is SSH and where is it useful?

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A trust-based remote access system

(used in AWS and clouds everywhere)

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What do you need to connect via SSH?

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  • Private Key (e.g. id_rsa)
  • Public Key (e.g. id_rsa.pub)
  • The same Public Key stored in the host’s authorized_keys file

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Why public AND private keys?

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Diffy-Hellman

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Demo Time:

Create a new key if you don’t already have one with:

  • ssh-keygen (mac & linux)
  • PuTTy (windows)

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A very basic ssh call:

$> ssh -i <private-key-path> <user>@<host>

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On our demo ec2 instance (AWS):

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Why will this not work when you attempt the same command with your private key?

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The host only allows those whose public key is on the list in ~/.ssh/authorized_keys

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For frequent ssh remoting to different instances, the ~/.ssh/config is a useful shorthand

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Host capp-demo

User ec2-user

Hostname ec2-54-82-235-131.compute-1.amazonaws.com

IdentityFile ~/.ssh/aws-ec2.pem

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Now, we can just remote in by our nickname:

ssh capp-demo

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wowowowowow