Linux Tips @gokhankici - Tumblr Blog

matplotlib Type-1 Fonts

Use the following settings:

matplotlib.rcParams['ps.useafm'] = True matplotlib.rcParams['pdf.use14corefonts'] = True matplotlib.rcParams['text.usetex'] = True

https://nerdjusttyped.blogspot.com/2010/07/type-1-fonts-and-matplotlib-figures.html

Download briss for free. This project aims to offer a simple cross-platform application for cropping PDF files. A simple user interface lets you define exactly the crop-region by fitting a rectangle on the visually overlaid pages.

Awesome tool for cropping pdfs, works even better than pdfcrop !

Find old kernel names

dpkg --get-selections | sed -n "s/$linux-image-[0-9].*-generic$[[:space:]]*install/\1/p"

Then pipe this to (vim|emacs) to select the kernels to remove and use them as the argument for the command sudo apt-get autoremove

#linux #kernel #remove #clean

Disabling ipv6

Edit the file - /etc/sysctl.conf and add the following to the end

# IPv6 disabled net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1

Then restart sysctl with

$ sudo sysctl -p

REF

#linux #network #ipv6 #ipv4 #sysctl

change string in multiple files

Use the following trick to replace a string in multiple files

grep -rl matchstring somedir/ | xargs sed -i 's/string1/string2/g' -r: recursively -l: only file name -i: in place

ref

#linux #grep #sed #replace #file #string

change keyboard layout

Enter these commands to change the keyboard layout to US/TR respectively:

setxkbmap -layout "us" setxkbmap -layout "tr"

You can see the current configuration by looking at the file:

/etc/default/keyboard

#linux #keyboard #layout

Stream video content to your devices with this open source UPnP media server.

You can use the following command to start/stop/restart the server:

sudo service mediatomb (start | stop | restart)

#upnp #video #ios #ipad #iphone #pc #stream

VIM - Using file as an input for shell programs

Hardly a day passes without me learning a new cool stuff about VIM :)

If you want to use the current file as an input to another program and see the result use the following command:

:w ! <shell-command-here>

If you know the lines you are interested:

:1,5w ! <command>

Or if you want to select your own part, while in visual mode

:'<'>:w ! <command>

And you were thinking VIM couldn't get cooler than this :D

#vim #shell #terminal #command

Easy SSH login with ~/.ssh/config

Rather than entering the username and ip address of your remote machine every time, you can set up a file at ~/.ssh/config to make the process easier.

It should look like the following:

Host <your alias for the remote machine> HostName <host machine's ip address> User <your user name>

That's it. Now you can connect with ssh <your alias> command to your machine.

Ref

#linux #ssh #config

Kismet - 802.11 layer2 wireless network detector, sniffer, and intrusion detection system

This is a powerful application, but I'm using it to find the channel numbers of the wifi access points near me.

To install you can either install from the repos, or download and compile it from https://kismetwireless.net/download.shtml .

To quick start, check the documentation at https://kismetwireless.net/documentation.shtml .

#wifi #wlan #802.11 #kismet #channel

Search for a file within Emacs

If you want to find a file in your system, when you don't know the path you execute something like this:

find ~ | grep .doc$

and learn the exact location of the file.

You can achieve this from the comfort of your Emacs using the find-name-dired command. This function first asks for the base folder to search recursively, and then a pattern (it supports wildcards) to list the matches.

#emacs #find #grep #name #file #find-name-dired

Imagemagick tools

I use imagemagick to convert image to different formats and create pdf's from images.

To convert bmp to jpg:

mogrify -format jpg *.bmp

Join jpg files into a pdf:

convert *.jpg file.pdf

#im #imagemagick #convert #mogrify #jpg #pdf #bmp #image