Mohammad Faani mfaani

Great video on stdin vs stdout: https://www.youtube.com/watch?v=OsErpB0-mWY

stdin

As a standard your input usually comes from the keyboard. Ex cat file.txt. <- here you're passing file.txt as a parameter.

However you can do cat < $file_name i.e. make the input to the cat command a variable.

Both cat file.txt & cat < file.txt achieve the same, but through different mechanics. < is passing something as an input.

I suppose it's because the cat command has abilities to handle file names as arguments and through stdin

Architecture

Offline Sync and Cache

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libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

	//Tutorial https://www.objc.io/issues/17-security/inside-code-signing/

	//Print which signing certificates are on computer
	security find-identity -v -p codesigning

	//Print what was used to codesign an app
	codesign -vv -d Example.app

	//Print what entitlements are enabled for app
	codesign -d --entitlements - Example.app

	alias plistbuddy=/usr/libexec/PlistBuddy
	alias codesign=/usr/bin/codesign


	#
	# Bundle identifier
	#

	set_plist_bundle_identifier() {
	local bundle_identifier="$1"

	# Swift syntax highlighting for Vim

	# Original Source: http://wingsquare.com/blog/swift-script-syntax-highlighting-and-indentation-for-vim-text-editor/
	# Another helpful article: https://billyto.github.io/blog/swift-syntax-vim
	# More about Vim packages: http://vimcasts.org/episodes/packages/

	echo "--- creating ~/.vim/pack/bundle/start dir.."
	mkdir -p ~/.vim/pack/bundle/start

	echo "--- Cloning Apple's Swift repo.."

	Debugger commands:

	apropos -- List debugger commands related to a word or subject.
	breakpoint -- Commands for operating on breakpoints (see 'help b' for
	shorthand.)
	bugreport -- Commands for creating domain-specific bug reports.
	command -- Commands for managing custom LLDB commands.
	disassemble -- Disassemble specified instructions in the current
	target. Defaults to the current function for the
	current thread and stack frame.

	// AFNetworking
	[[AFHTTPSessionManager manager] GET:@"http://httpbin.org/ip" parameters:nil success:^(NSURLSessionDataTask *task, id JSON) {
	NSLog(@"IP Address: %@", JSON[@"origin"]);
	} failure:^(NSURLSessionDataTask task, NSError error) {
	NSLog(@"Error: %@", error);
	}];


	// NSURLSession
	NSURL *URL = [NSURL URLWithString:@"http://httpbin.org/ip"];

	# Open the existing Xcode project
	project_file = product_name + '.xcodeproj'
	project = Xcodeproj::Project.new(project_file)

	# Add a file to the project in the main group
	file_name = 'Message.m'
	group_name = product_name
	file = project.new_file(file_name, group_name)

	# Add the file to the main target