kovetskiy

#!/bin/bash
###
### my-script — does one thing well
###
### Usage:
###   my-script <input> <output>
###
### Options:
###   <input>   Input file to read.
###   <output>  Output file to write. Use '-' for stdout.

owent

/**
 * traceback for cpp
 *
 *  Created on: 2018-01-27
 *      Author: owent
 *
 *  Released under the MIT license
 * 
 *  @note Required flag -rdynamic or addr2line to get the function name when using gcc/clang in unix like system
 *  @note Using addr2line -Cfpe <exe_path> [func_addr...] for more detail when using gcc/clang

ipbastola

JQ to filter JSON by value

Syntax: cat <filename> | jq -c '.[] | select( .<key> | contains("<value>"))'

Example: To get json record having _id equal 611

cat my.json | jq -c '.[] | select( ._id | contains(611))'

Remember: if JSON value has no double quotes (eg. for numeric) to do not supply in filter i.e. in contains(611)

Akagi201

video subtitle

ffmpeg -i *.mp4 -vf subtitles=*.srt output.mp4

element stream to ts

• ffmpeg -i audio.aac -i ch2.h264 -acodec copy -vcodec copy -f mpegts out.ts

rtsp 2 rtmp

• ffmpeg -rtsp_transport tcp -i rtsp://fuck.com/fuck/fuck -c copy -f flv rtmp://shit.com/shit/shit

截图片

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

dervn

#用正则简单过滤html的<>标签
import re
str = "<img /><a>srcd</a>hello</br><br/>"
str = re.sub(r'</?\w+[^>]*>','',str)
print str