Download Youtube

pytube: A lightweight, dependency-free Python library (and command-line utility) for downloading YouTube Videos.

Usage

from pytube import YouTube
YouTube('https://www.youtube.com/watch?time_continue=25&v=siAMDK8C_x8').streams.first().download()

Install

pip install pytube

PDF

Combine PDFs

pdftk is a very comvenient tool to process PDFs.

Install:

sudo apt install pdftk

Usage

>>>ls
b11496-10.pdf  b11496-14.pdf  b11496-2.pdf   b11496-6.pdf   
b11496-11.pdf  b11496-15.pdf  b11496-3.pdf   b11496-7.pdf   
b11496-12.pdf  b11496-16.pdf  b11496-4.pdf   b11496-8.pdf   
b11496-13.pdf  b11496-1.pdf   b11496-5.pdf   b11496-9.pdf 
>>>pdftk b11496-{1..16}.pdf cat output Matlab-Java-Programming.pdf
>>>ls
b11496-10.pdf  b11496-15.pdf  b11496-4.pdf  b11496-9.pdf
b11496-11.pdf  b11496-16.pdf  b11496-5.pdf  Matlab-Java-Programming.pdf
b11496-12.pdf  b11496-1.pdf   b11496-6.pdf
b11496-13.pdf  b11496-2.pdf   b11496-7.pdf
b11496-14.pdf  b11496-3.pdf   b11496-8.pdf

Crop PDF

tmux

Basic Usage

Split windows vertically:

<ctrl-B>%

Split windows horizontally:

<ctrl-B>"

Switch tabs:

<ctrl-B>leftarrow[rightarrow, etc]

Resize a tab:

<ctrl-B><ctrl [left,up,right]>

Close a tab:

<ctrl-B>x

Create a new window:

<ctrl-B>c

Switch to previous window:

<ctrl-B>p

Switch to next window:

<ctrl-B>n

Close a window:

<ctrl-B>&

Scroll:

Ctrl-b then [ then you can use your normal navigation keys to scroll around (eg. Up Arrow or PgDn). Press q to quit scroll mode.

Crop Video using FFMPEG

Use the crop filter:

ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4

Where the options are as follows:

out_w is the width of the output rectangle
out_h is the height of the output rectangle
x and y specify the top left corner of the output rectangle

Ref

sed - replace file in place

Replace

![](/assets/Screenshot%20from%202017-12-28%2015-01-32.png)

with

![](/assets/Screenshot from 2017-12-28 15-01-32.png)

using sed:

sed -i 's/{{"assets/{{site.baseurl}}\/assets/g' tmp.txt
sed -i 's/"\s|\sabsolute_url}}//g' tmp.txt 

Replace

<div style="text-align:center"><img src ='{{"assets/Screenshot from 2017-12-29 22-46-33.png" | absolute_url}}' /></div>

with

<div style="text-align:center"><img src ='{{site.baseurl}}/assets/Screenshot from 2017-12-29 22-46-33.png' /></div>`

using:

sed -i 's/"assets/site\.baseurl}}\/assets/g'
sed -i 's/"\s|\sabsolute_url}}//g'

Notepad++

Shift highlighted lines to the right one tab length by pressing the tab key.
Shift them to the left by pressing shift-tab.