Derek drkjc

Useful Awks

CSV awks (where the file separator is set to "," using -F,)

Just a collection of awks that I have found useful for manipulating CSV files.

Finding and counting things

awk to just print specific column:

I really liked @tjvantoll article Handling Failed HTTP Responses With fetch(). The one thing I found annoying with it, though, is that response.statusText always returns the generic error message associated with the error code. Most APIs, however, will generally return some kind of useful, more human friendly message in the body.

Here's a modification that will capture this message. The key is that rather than throwing an error, you just throw the response and then process it in the catch block to extract the message in the body:

fetch("/api/foo")
  .then( response => {
    if (!response.ok) { throw response }
    return response.json()  //we only get here if there is no error
 })

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

SHORTCUTS

Key/Command	Description
Tab	Auto-complete files and folder names
Ctrl + A	Go to the beginning of the line you are currently typing on
Ctrl + E	Go to the end of the line you are currently typing on
Ctrl + U	Clear the line before the cursor
Ctrl + K	Clear the line after the cursor
Ctrl + W	Delete the word before the cursor
Ctrl + T	Swap the last two characters before the cursor

	# Terminal Cheat Sheet

	pwd # print working directory
	ls # list files in directory
	cd # change directory
	~ # home directory
	.. # up one directory
	- # previous working directory
	help # get help
	-h # get help

	$ ps ax \| grep shotgun
	11152 s000 R+ 0:00.00 grep shotgun
	10766 s001 S+ 0:00.60 /Users/ryandeussing/.rvm/gems/ruby-1.9.3-p429@sinatra/bin/shotgun

	$ kill -9 10766

	#done

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