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Permissions:

1 – can execute
2 – can write
4 – can read

The octal number is the sum of those free permissions, i.e.

3 (1+2) – can execute and write
6 (2+4) – can write and read

Position of the digit in value:

1 – what owner can
2 – what users in the file group(class) can
3 – what users not in the file group(class) can

Examples:

chmod 600 file – owner can read and write
chmod 700 file – owner can read, write and execute
chmod 666 file – all can read and write
chmod 777 file – all can read, write and execute

25 years after Linus Torvalds unveiled Linux, the free operating system is still finding new uses.

screen record recording pantalla

NixOS is a Linux distribution with a unique approach to package and configuration management. Built on top of the Nix package manager, it is completely declarative, makes upgrading systems reliable, and has many other advantages.

TL;DR: Installation images for many of the most popular Linux distributions are difficult or impossible to obtain securely via download. Linux security is a very complex topic. Modern Linux distributions boast intricate security features in both kernel and userspace, designed to guard against anything from memory corruption exploits...

List of ports open

http://superuser.com/a/529844 (net-stat is deprecated)
http://www.cyberciti.biz/faq/how-do-i-find-out-what-ports-are-listeningopen-on-my-linuxfreebsd-server/

# nmap -sS -O 127.0.0.1
# lsof -i
# netstat -lptu
# netstat -tulpn

synclient TapButton3=2

curl    -H "Date: Mon Jun  6 13:50:50 ART 2016" \
        -H "Authorization: oi2u987c89qwkhje2k1" \
        -H "Content-Type: application/json" \
        "127.0.0.1:9001?do=api"

===

curl -X POST \
    --header 'Content-Type: application/json' \
    --header 'Accept: application/json' \
    -d '{ "client_id": 1 }' \
    'http://api.site.com/categories'

$ upower -i $(upower -e | grep 'BAT') | grep -E "state|to\ full|percentage"