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RaviTeja Pothana RaviTezu

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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
@RaviTezu
RaviTezu / remove_except_master.sh
Last active March 29, 2018 10:52 — forked from leoapost/gist:4318441
Delete all remote branches, except master on your fork | github.
#!/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
@RaviTezu
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

  1. 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?
@RaviTezu
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
@RaviTezu
RaviTezu / go-get-gitlab-ssh-nginx
Created November 1, 2016 04:51 — forked from jpillora/go-get-gitlab-ssh-nginx
Go get Gitlab ssh paths with 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://[email protected]:2200$uri.git' name='go-import'></head></html>";
@RaviTezu
RaviTezu / gist:47499fb59bb12014b1ea51ed3da67643
Created September 14, 2016 06:09 — forked from justincase/gist:5469009
Print struct with field names and values. From http://blog.golang.org/2011/09/laws-of-reflection.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++ {
@RaviTezu
RaviTezu / ipcalc.go
Created June 16, 2016 17:38 — forked from kotakanbe/ipcalc.go
get all IP address from CIDR in golang
package main
import (
"net"
"os/exec"
"github.com/k0kubun/pp"
)
func Hosts(cidr string) ([]string, error) {
@RaviTezu
RaviTezu / Install_nginx_from_src_with_module.sh
Last active November 26, 2015 10:11 — forked from zefer/Install_nginx_from_src_with_module.sh
Compile nginx from source, include the Headers More module - Ubuntu
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
@RaviTezu
RaviTezu / walk.go
Created November 13, 2015 10:40 — forked from tdegrunt/walk.go
Replace some text in a bunch of files with golang
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
@RaviTezu
RaviTezu / whisper-calculator.py
Last active September 10, 2015 10:36 — forked from jjmaestro/whisper-calculator.py
whisper-calculator.py: Calculates the size of the whisper storage for the given retention (in frequency:history format)
#!/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,