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# vim: set ft=gdb

set print pretty on
set pagination off
set print repeats 16

handle SIGPIPE nostop


### nginx debug function ###

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ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

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#!/usr/bin/awk -f
#
# call_graph.awk
#
# Usage:
#   ./call_graph.awk my_program.lua | dot -Tsvg > call_graph.svg
#
# This is a script that generates a visual call graph for a Lua file.
# This script only shows calls made to functions defined within the
# input Lua file; that is, it excludes calls such as standard library

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#!/usr/bin/env lua

local pl_template = require "pl.template"

local tmpl_str = [[
<ul>
# for i,val in ipairs(T) do
<li>$(i) = $(val:upper())</li>
# end
</ul>

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#!/usr/bin/env bash

jq 'walk( if (type == "object") and has("documentation") and (.documentation|contains("wJalrXUtnFEMI")) then del(.documentation) else . end )' sts-2011-06-15.normal.json >| output.json
# -or-
jq '(.. | select( (type == "object") and (.documentation != null) and (.documentation|contains("wJalrXUtnFEMI")) ) ) |= del(.documentation)' sts-2011-06-15.normal.json >| output.json

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-- table to monitor
ori_t = { a = "b" }
    
-- a proxy table - must be empty
proxy_t = {}

local mt
do
   mt = {
      __index = function (self, k)

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local sb = require "string.buffer"

local buff = sb.new()

buff:put("a", "", "c")
print("buff len after put: ", #buff)

local str = buff:get()
print("1st get: ", str)
print("buff len after 1st get: ", #buff)

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local pl_pretty = require("pl.pretty").write

-- create cosocket
local sock = ngx.socket.tcp()

sock:settimeouts(1000, 15000, 15000)

ngx.say("sock 1 = ", pl_pretty(sock))

-- create kernel socket

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local func -- Forward declaration. `local func = nil` is the same.

local function func2() -- Suppose you can't move this function lower.
    return func() -- reference to name, not to its value
end

-- error
print(func2())

function func() -- defined here

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local socket = require("socket")

local host, port = "180.101.50.242", 80
local sock = socket.connect(host, port)
sock:settimeout(1)
sock:send("GET / HTTP/1.1\r\n\r\n")
sock:close()