RaviTeja Pothana RaviTezu

## gist:caa34651a750621cb06a068ad6085b59

      
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                RaviTezu
                / gist:caa34651a750621cb06a068ad6085b59
            
            
              Created
              June 23, 2020 12:48
                — forked from Khoulaiz/gist:41b387883a208d6e914b
            
              
                Checking ports without telnet
              
          
    Here are several different ways to test a TCP port without telnet.
BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23


## remove_except_master.sh
#!/usr/bin/env bash
set -e

# The MIT License (MIT)

# Copyright (c) 2018 RaviTezu

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights

## System Design.md

      
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                RaviTezu
                / System Design.md
            
            
              Created
              December 30, 2017 07:51
                — forked from vasanthk/System Design.md
            
              
                System Design Cheatsheet
              
          
    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?


## stages.md

      
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                RaviTezu
                / stages.md
            
            
              Created
              September 29, 2017 06:56
                — forked from lestrrat/stages.md
            
              
                Seven Stages of Becoming a Go Programmer
              
          
stage 1: You believe you can make Go do object oriented programming. You want to do this by using clever struct embedding.
stage 2: You believe goroutines will solve all of your problems. You want to use goroutines for anything and everything that you can, who cares if the code becomes a bit more complicated
stage 3: You believe that instead of object oriented programming, interfaces will solve all of your problems. You want to define everything in terms of interfaces
stage 4: You believe channels will solve all of your problems. You want to do everything from synchronization, returning values, and flow control using channels.
stage 5: You now believe Go is not as powerful as people claim it to be. You feel like you're stripped of all of the nice tools and constructs that other languages provide.
stage 6: You realize that stages 1~5 were all just your imagination. You just didn't want to accept the Go way. Everything starts to make sense.
stage 7: You are now at peace


## go-get-gitlab-ssh-nginx
location / {
	## check for goget AND /namespace/project
	if ($args ~* "^go-get=1") {
		set $condition goget;
	}
	if ($uri ~ ^/([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)$) {
		set $condition "${condition}path";
	}
	if ($condition = gogetpath) {
		return 200 "<!DOCTYPE html><html><head><meta content='git.axon$uri git ssh://git@gitlab.mycompany.com:2200$uri.git' name='go-import'></head></html>";

## gist:47499fb59bb12014b1ea51ed3da67643
type T struct {
    A int
    B string
}

t := T{23, "skidoo"}
s := reflect.ValueOf(&t).Elem()
typeOfT := s.Type()

for i := 0; i < s.NumField(); i++ {

## ipcalc.go
package main

import (
	"net"
	"os/exec"

	"github.com/k0kubun/pp"
)

func Hosts(cidr string) ([]string, error) {

## Install_nginx_from_src_with_module.sh
sudo su -

# stuff we need to build from source
apt-get install libpcre3-dev build-essential libssl-dev

# get the nginx source
cd /opt/
wget http://nginx.org/download/nginx-0.8.54.tar.gz
tar -zxvf nginx*
# we'll put the source for nginx modules in here

## walk.go
package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
)

## whisper-calculator.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-


def archive_to_bytes(archive):
    def to_seconds(s):
        SECONDS_IN_A = {
            's': 1,
            'm': 1 * 60,
            'h': 1 * 60 * 60,
	#!/usr/bin/env bash
	set -e

	# The MIT License (MIT)

	# Copyright (c) 2018 RaviTezu

	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	location / {
	## check for goget AND /namespace/project
	if ($args ~* "^go-get=1") {
	set $condition goget;
	}
	if ($uri ~ ^/([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)$) {
	set $condition "${condition}path";
	}
	if ($condition = gogetpath) {
	return 200 "<!DOCTYPE html><html><head><meta content='git.axon$uri git ssh://git@gitlab.mycompany.com:2200$uri.git' name='go-import'></head></html>";
	type T struct {
	A int
	B string
	}

	t := T{23, "skidoo"}
	s := reflect.ValueOf(&t).Elem()
	typeOfT := s.Type()

	for i := 0; i < s.NumField(); i++ {
	package main

	import (
	"net"
	"os/exec"

	"github.com/k0kubun/pp"
	)

	func Hosts(cidr string) ([]string, error) {
	sudo su -

	# stuff we need to build from source
	apt-get install libpcre3-dev build-essential libssl-dev

	# get the nginx source
	cd /opt/
	wget http://nginx.org/download/nginx-0.8.54.tar.gz
	tar -zxvf nginx*
	# we'll put the source for nginx modules in here
	package main

	import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	)
	#!/usr/bin/env python
	# -- coding: utf-8 --


	def archive_to_bytes(archive):
	def to_seconds(s):
	SECONDS_IN_A = {
	's': 1,
	'm': 1 * 60,
	'h': 1 * 60 * 60,