Home
>
Personal Technology
>
Setting File Permissions On A Unix Server

Setting File Permissions On A Unix Server

File permissions are one of the strengths that the Unix world has had over it's Windows contemporaries. Permissions are a means to control access to information on a computer, on a file by file basis. There are several layers of control, and these will be discussed below.

For the purpose of this series of tutorials, I have been using a free FTP program called Core FTP Lite to upload files to my server. I am using this program to describe my examples.

Ok, to begin, let's say that we have uploaded some files to a server.

We are discussing uploading scripts in general here, and certainly for many scripts, the creators may well specify certain 'permissions' that need to be set in order for the scripts to operate correctly. Let's take a look at a set of files on a server. In Core FTP Lite, the server files are shown in the right hand pane. Select one and then right click on the highlighted file.If you use a different FTP client, I expect that the layout will be very similar.

Run the mouse down to the bottom of the menu and select the item marked 'Properties'. Click on this option, and another dialog will appear.

You will see that the file in question (in this case a directory) is being shown in the 'File' field at the top of the screen.

What we are really interested in, is the tick boxes in the bottom half of the screen. These hold the file 'privileges' or 'permissions' for this file or directory.

There are three types of 'permissions' available.

* User - which means the person signed on who is setting the permissions

* Group - which means a specific group of users for whom access to the file has been granted

* World - which means everyone.

Within these groups of users, there are 3 distinct types of permissions

* Read - which means that permission to read a file, but not alter it or run it

* Write - which means permission to write to a file and change it

* Execute - which means permission to execute a file, which is important in the case of scripts for example.

Permissions are sometimes called by these names (read, write, execute) but are more commonly referred to using letters 'rwx'. In addition, permissions are sometimes referred to by a single number '755' for example. In the picture above, you will see a value box. This is the number being referred to. How is this number made up? Well let me explain.

Read
User 400

Group 40

World 4

Write
User 200

Group 20

World 2

Execute
User 100

Group 10

World 1

Each value for each setting is shown. Try them out by ticking them, and see the number in the 'Value' field change accordingly.

So, lets look at a real example

Can you see how the number 755 is made up? Add up the individual values from the value table and see.

So hopefully you can see, that setting file permissions with the right tool is not hard at all.

Charlie Cory worked or many years running a HelpDesk for a software house, and has experience in many operatng systems and technologies. The online aticle contains many pictures which help bring this tutorial to life.

setting file permissons

green cleaning service Park Ridge ..

In The News:

Your home address is easily accessible on people finder sites, putting you at risk for stalking and identity theft, but data removal services can help protect your personal information.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents

Robot combat evolves at Unitree's Iron Fist King event as G1 robots face off in China, featuring knockouts, precise strikes and agile machines that can perform side flips.

Take control of your digital privacy with actionable tips like Facebook privacy checkup, location tracking management and data removal services to protect your personal information.

Smart TVs and streaming devices manufactured in China are being compromised by BadBox 2.0 malware before users even power them on; infections have been detected in 222 countries.

The lightweight, 15-pound Tenniix tennis robot mimics pro playing styles like Nadal and Federer, using AI trained on 8,000 hours of professional tennis data.

Oak Ridge's uranium enrichment facility supports America's AI ambitions amid concerns that China's aggressive nuclear reactor construction could give it an edge in powering data centers.

Facebook scam ads now leverage AI and deepfakes to create convincing celebrity endorsements, targeting specific demographics with sophisticated schemes.

Apple unveils iOS 26, macOS 26 Tahoe and iPadOS 26 with translucent Liquid Glass design at WWDC 2025, featuring ChatGPT integration as competitors advance rapidly.

The Atom Touch prosthetic arm combines an AI neural interface with EMG sensors, allowing amputees to control individual fingers with precision at an affordable $25,000.

Aspen officials aim to have crews on the scene within five minutes — something they say would be nearly impossible without precise location data the AI technology gives.

Tech expert Kurt “CyberGuy" Knutsson says iPads are usually secure, but hackers can access them. Spot warning signs early to protect your data.

Tech expert Kurt Knutsson reveals how to easily move photos and videos off your iPhone or Android to securely protect your favorite moments.

The Social Security Administration is launching digital SSN access this summer. Tech expert Kurt “CyberGuy" Knutsson helps you learn how to use it and protect your identity.

Glide underwater with CudaJet and make the ocean your playground. Kurt “CyberGuy" Knutsson discusses the redesigned tech that might be your next big thrilling adventure.

Protect yourself from login alert scams with five security steps, including avoiding suspicious links, checking account activity and enabling two-factor authentication

Skip the usual Father's Day gifts with personalized ideas for tech enthusiasts, home brewers, pool owners, seniors, outdoor lovers and privacy-conscious dads.

DMV text scam alert: Fraudsters impersonating motor vehicle departments nationwide are sending threatening messages about unpaid tickets and tolls to steal your information.

Fox News' AI Newsletter brings you the latest on this rapidly evolving technology.

E-BAR, MIT's mobile robot, provides physical support for seniors with handlebars that follow from behind, helping prevent falls while maintaining dignity for aging adults.

AI is changing everything – now, we can even use it to generate video. I tried OpenAI's Sora and Google's Veo – here's how they measure up against each other.

Five simple phone setting tweaks that make your device work harder for you, from automatic text message deletion to scheduled focus modes.

Android users can save time with 10 simple automations, including automatic battery saver mode, location-based Wi-Fi settings and scheduled "Do Not Disturb" mode.

Personal information from 364,000 people was compromised in a LexisNexis data breach that went undetected for months, highlighting privacy risks.

The Phantom 3500 jet features a windowless design that reduces drag and structural weak points, burning 50% less fuel than conventional business jets.

Setting File Permissions On A Unix Server

Personal Technology