Linux Essentials For Hackers - #4 - File & Directory Permissions

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Welcome to the Linux Essentials For Hackers series, where we will be covering the 20% you need to know to be efficient with Linux. In this video, we will be covering file and directory permissions in Linux.

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ls -al

file_permissions:

if the file name starts with a - as the first character, its a regular file
if the file name starts with a d, its a directory

r -- readable

w -- write permissions to the file

x -- excute the file

the first two characters after the - or d, shows the owner permissions along with the user name

the second colum is the group permissions along with the group name

and the rest of the colums is for world permissions, meaning that everyone else could just read it or do other stuff with the files if they have the permission to do so.

chmod - change mode and permissions
ugo = user, group, and owner
chmod u=rwx (u for user) you could do this for a specific user
or chmod +rwx (file)

octal mode:
r = 4
w = 2
x = 1

rdcludzz

Consider the permissions like this rwx 4=100(read bit is set r--) 2 = 010(write bit is set -w-) 1=001(executable bit is set --x). So simply
000 =0 = ---
001=1 = --x
010=2 = _w-
011=3 = -wx
100=4 = r--
101=5 = r-x
110=6 = rw-
111=7 = rwx
This is the best way to remember it. Just think it like a binary to octal conversion.
And you can use the ocatal numbers for owner grp others respectively. Like 777 = full permission for all 754 means full for owner r_x(read and execute for ) grp r--(read only for others)

sarathk

Thank you so much for these. For anyone else learning Linux in the future, try to grasp what he is saying and doing while doing it yourself, then at the end of the video, practice the commands for a bit until you understand it well before moving to the next video. Due to Alexis being humble and genuine, I also want to let you guys know he has an in depth administration course on his website for cheap as anything (10$) - Highly recommend it as I'll be purchasing that myself as well.

brownintrovert

Omg I been waiting for the continuation!!!! Awesome man I’m learning so much from your channel love it!!!!
You think you can do a python tutorial for basics and making bots?!

cybraxe

hey Alexis another great video, your teaching skills are simply out of this world I've learned more in your tutorials then my college and uni combined, if I have a power I would gladly give you The George Cross award

tonyfernandes

*furiously takes notes*. I feel my knowledge expanding with every one of these vids. Thanks!

tgraphicdesign

Great tutorials, It's difficult at the beginning but becomes easier as you try them on your own. Thanks

surkewrasoul

Loving these videos bro. Keep them coming !

sekytwo

First thing I need is mechanical keyboard...

shibinpm

Bro you're a flippin legend among the YouTube teachers.

badsanta

I’m learning so much from your channel

hamzav

Hey Mr HackerSploit, thanks again
I love the Binary or Octal Mode format too
755 is more ideal i guess, well all depends on requirements or needs of the project.

Much love from share

droidhackerr

hello brother actually am doing CEH course but you're the best and better then my institute

Life-style-

Thank You ! Amazingly clear ;))) Peace

frederic_viennot

Just adding on, hope i'm right, In the symbolic format, use '-' to specify no permissions and in the binary format use '0' to specify no permissions(seems like those are the current ones unless there's appropriate versions)

Venormous