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alex-egorov /
Created September 4, 2021 13:01 — forked from mohanpedala/
set -e, -u, -o, -x pipefail explanation

set -e, -u, -x, -o pipefail

The set lines

  • These lines deliberately cause your script to fail. Wait, what? Believe me, this is a good thing.
  • With these settings, certain common errors will cause the script to immediately fail, explicitly and loudly. Otherwise, you can get hidden bugs that are discovered only when they blow up in production.
  • set -euxo pipefail is short for:
set -e
set -u
tclementdev /
Last active July 12, 2024 03:33
Making efficient use of the libdispatch (GCD)

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

mrw34 /
Last active June 13, 2024 08:14
Enabling SSL for PostgreSQL in Docker
set -euo pipefail
openssl req -new -text -passout pass:abcd -subj /CN=localhost -out server.req -keyout privkey.pem
openssl rsa -in privkey.pem -passin pass:abcd -out server.key
openssl req -x509 -in server.req -text -key server.key -out server.crt
chmod 600 server.key
test $(uname -s) = Linux && chown 70 server.key
docker run -d --name postgres -e POSTGRES_HOST_AUTH_METHOD=trust -v "$(pwd)/server.crt:/var/lib/postgresql/server.crt:ro" -v "$(pwd)/server.key:/var/lib/postgresql/server.key:ro" postgres:12-alpine -c ssl=on -c ssl_cert_file=/var/lib/postgresql/server.crt -c ssl_key_file=/var/lib/postgresql/server.key
furkanmustafa / .tmux.conf
Created December 14, 2016 01:51
Tmux Configuration
set -g default-terminal "screen-256color"
#set -g history-limit 10000
#set -g mode-mouse on
#set -g terminal-overrides 'xterm*:smcup@:rmcup@'
#set -g mouse-select-pane on
#set -g mouse-select-window on
#set -g mouse-resize-pane on
bind -n WheelUpPane copy-mode
bind -n S-down new-window
Ghost in the shell - Ordered list of Movie and Series
- Ghost in the Shell (1995/10)
- Ghost in the Shell 2: Innocence (2004/3)
- (Series) Ghost in the Shell: Stand Alone Complex (2002/10 .. 2003/10, 26 episodes)
erkanyildiz / EYVersionLabel.h
Last active November 28, 2018 14:33
Convenience label for displaying app name, app version and copyright dates automatically
// erkanyildiz
// 20161004-1321+0900
// EYVersionLabel.h
#import <UIKit/UIKit.h>
@interface EYVersionLabel : UILabel
@property (nonatomic, strong) NSNumber* initialYear;
JaviLorbada / FRP iOS Learning
Last active June 17, 2024 06:08
The best FRP iOS resources.


myusuf3 /
Created November 3, 2014 17:36
How effectively delete a git submodule.

To remove a submodule you need to:

  • Delete the relevant section from the .gitmodules file.
  • Stage the .gitmodules changes git add .gitmodules
  • Delete the relevant section from .git/config.
  • Run git rm --cached path_to_submodule (no trailing slash).
  • Run rm -rf .git/modules/path_to_submodule (no trailing slash).
  • Commit git commit -m "Removed submodule "
  • Delete the now untracked submodule files rm -rf path_to_submodule
matthewmueller /
Last active April 21, 2024 03:30
OSX for Hackers (Mavericks/Yosemite)
# OSX for Hackers (Mavericks/Yosemite)
# Source:
# Some things taken from here
# Ask for the administrator password upfront
furkanmustafa / NSDate+Formatters.h
Last active June 13, 2017 20:11
a few NSDateFormatter helpers for Objective-C
/* */
// DateFormat Reference :
#import <Foundation/Foundation.h>
extern NSString* const DATEFORMAT_RFC3339;
@interface NSDate (FMDateFormatters)
+ (NSDate*)dateWithString:(NSString*)dateString format:(NSString*)format locale:(NSLocale*)locale timezone:(NSTimeZone*)zone;