yradunchev

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

yradunchev

DEV=eth0
PORT=80


### Use SYNPROXY ###
/sbin/iptables -t raw -A PREROUTING -i $DEV -p tcp -m tcp --syn --dport $PORT -j CT --notrack         
/sbin/iptables -t mangle -A INPUT -i $DEV -p tcp -m conntrack --ctstate INVALID,UNTRACKED --dport $PORT -j SYNPROXY \
         --sack-perm --timestamp --wscale 7 --mss 1460         
/sbin/iptables -t mangle -A INPUT -i $DEV -p tcp -m conntrack --ctstate INVALID --dport $PORT -j DROP

yradunchev

Do I have the correct certificate to sign my APK?

Use keytool Keytool is part of Java, so make sure your PATH has Java installation dir in it.

Get APK Certificate Signature

First, unzip the APK and extract the file /META-INF/ANDROID_.RSA (this file may also be CERT.RSA or something.RSA, but there should only be one .RSA file).

Then, run:

yradunchev

deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse
deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse
deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
deb [arch=amd64,i386] http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse

deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse

yradunchev

GnuPG offline Master key using a YubiKey (for Arch Linux)

Introduction

This guide is a compilation of four other guides. It instructs how to create a set of GnuPG keys which the master key is offline and the actual subkeys only live inside your YubiKey (acting as a smartcard). What ends up in your (online) daily machine are only the stubs of the subkeys.

Install required software

yradunchev

1. Copy/Paste the information below to the clipboard
2. Open the spreadsheet whose sheets need to be alphabetised
3. Choose Tools > Script editor > Blank (this opens a new tab in the browser)
4. Press Control+A followed by Control+V copy and paste the script in
5. Press Control+S to save the script
6. Choose Run > sortSheets
7. Go back to the spreadsheet tab to view the new sorted tab order

--Copy everything below this line--
function sortSheets () {

yradunchev

ffmpeg -i test.wav -y -loop 1 -i bg.jpg -filter_complex \
"[0:a]showfreqs=cmode=separate:mode=bar:ascale=cbrt:fscale=log:s=600x600:colors=#ffffff[tmp]; \
 [tmp]alphaextract,format=yuv420p,split=3[box][up][down]; \
 [up]crop=in_w:in_h/2:0:0[up]; \
 [down]crop=in_w:in_h/2:0:in_h/2,vflip[down];[up][down]vstack[tmp]; \
 [tmp]gblur=sigma=10,curves=master='0/0 0.49/0 0.51/1 1/1',format=rgba[tmp]; \
 [box]drawbox=w=600:h=600:c=#ffffff:t=fill:replace=1,format=rgba[box]; \
 [box][tmp]alphamerge[tmp]; \
 [tmp]crop=in_w:in_h/2:0:in_h/4[tmp]; \
 [1:v]scale=1280:-1,crop=in_w:720[bg]; \

yradunchev

Convert audio to video with ffmpeg - examples

avectorscope

ffmpeg -i input.mp3 -filter_complex "[0:a]avectorscope=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a avectorscope.mp4

showcqt

ffmpeg -i input.mp3 -filter_complex "[0:a]showcqt=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a showcqt.mp4

ahistogram

ffmpeg -i input.mp3 -filter_complex "[0:a]ahistogram=s=1920x1080,format=yuv420p[v]" -map "[v]" -map 0:a ahistogram.mp4

yradunchev

Recording

• Ensure you're recording in 16-bit PCM + 44100Hz.
• Do a sound check, record everyone in the room speaking. You want the lighter part of the meter bar (the green or red bar at the top) to bounce between -12db and -6db while people are talking. It's hard to achieve this... so just settle for as close as you can get, without the bars going off the scale :)
• Play it back and tweak levels until it sounds good @ 60% speaker volume.
• Save the Project BEFORE recording live :D (prevents quality issues)

Edit for Content

• Join recordings to one track.
• Listen to it + Edit bad content out.
• Save this copy to Google Drive, or another backup spot.

yradunchev

# comments example for .dat or .ledger files
@smallexample
; This is a single line comment,
# and this,
% and this,
| and this,
* and this.

# If you have a deeply nested tree of accounts, 
# it may be convenient to define an alias, for example: