About
Hello, my name is Zeth, I'll be your host here.
Command Line Warriors is about taking control of your own technology, it looks at our experiences of computing; especially using GNU/Linux, the Python programming language, the command-line and issues such as techno-ethics, best practices and whatever is cool now. If you take control of your technology then you are a Warrior too!
This site is your site too which means that you can contribute and get involved. You can leave comments using the facility provided. For me, the comments and discussions are by far the best part of the site. So please do have your say!
Latest Discussions
Cupcake
July 31, 2010
Good post! You helped me a lot with my school project! CountryField(blank = True) < (K)
→
Countries in Django
LeshaShampoo
July 30, 2010
it was very interesting to read commandline.org.uk I want to quote your post in my blog. It can? And you et an account on Twitter?
→
Email Syntax Check in Python
vemma2018
July 30, 2010
I find myself coming to your blog more and more often to the point where my visits are almost daily now!
→
On Comment Spam
layecenda
July 30, 2010
Hello. And Bye.test :) http://idfjhvihdfiphvlajbvhalibv.com
→
PuTTY Series: Adding PuTTY to your system path
scuba
July 30, 2010
I’ve been visiting your blog for a while now and I always find a gem in your new posts. Thanks for sharing.
→
On Comment Spam
Businesking
July 30, 2010
Great site and articles for hack for win, I said Amazing post
→
How not to program WSGI
Tehnoking
July 30, 2010
This is Great post to learn about the hack Thumbs-up for you :D
→
How not to program WSGI
Syabiltech
July 30, 2010
I think this articles for master...because very hard to learning, As blogger beginners like me.
→
How not to program WSGI
coffeeatea
July 30, 2010
Are you looking for coffee gifts? We can tell you more about the coffee gifts including coffee machines and coffee pods.
→
Introducing Soturi - yet another Django blog application
noni juice
July 30, 2010
I just sent this post to a bunch of my friends as I agree with most of what you’re saying here and the way you’ve presented it is awesome.
→
On Comment Spam
Dion Moult
July 29, 2010
What I do know is that ever since I tried out Opera and put their tab bar on the left as a column, I've loved that layout. Back on Firefox ...
→
We need a thoughout integration of the desktop and the web - not Tab Candy superfast jellyfish
ZonaEntertainment
July 29, 2010
Wow useful articles, I'm read to learn about this and now I bookmark this to my Facebook, thanks for share!
→
How not to program WSGI
Giacomo
July 29, 2010
Honestly, I think both Mozilla and you are wrong :) This sort of concept adds overhead. A user would have to manage all this crap, constantly dragging and dropping, creating ...
→
We need a thoughout integration of the desktop and the web - not Tab Candy superfast jellyfish
Matija "hook" Šuklje
July 29, 2010
As a minimalist, you'll probybly moan if I mention KDE, but I'll do so anyway ;) The future I want (and actually see slowly fold out before me) is to ...
→
We need a thoughout integration of the desktop and the web - not Tab Candy superfast jellyfish
tahitian noni
July 28, 2010
Thank You For This Blog, was added to my bookmarks.
→
On Comment Spam
Rick
July 28, 2010
I already have piles. It's called A New Window.
→
We need a thoughout integration of the desktop and the web - not Tab Candy superfast jellyfish
Tech News
July 25, 2010
Thanks for this short tutorial...was auto-FTPing my files from my appserver to webserver for my tech news website. Everything was OK until someone hacked it. Hosting provider is now recommending ...
→
SFTP in Python: Really Simple SSH
naypalm
July 24, 2010
During the past 3-4 years, I and many others have enjoyed unlimited 2G/3G internet. But ever since the massive cult-like following of i Phone users in the US, most cellular ...
→
Calling time on mobile internet nonsense?
Steve
July 15, 2010
Very occasionally, you will run into a Java program that uses a lot of memory just to hold all the classes used. It turns out that the JVM uses a ...
→
Three classic command line tips
no
July 14, 2010
1. number one 2. number two 4. number four 3. number three 6. number six # first # second ## second-ay ## second-bee ### second-bee-one ### second-bee-two
→
An Introduction to ReStructuredText
1 Paul says...
You'll be wanting Access Control Lists then. :)
Posted at 4:10 p.m. on March 20, 2008
2 Brendan says...
....err...what Paul said, only here's an article on their usage. It's a bit dated, but I think it's still accurate.
Posted at 4:13 p.m. on March 20, 2008
3 mish says...
I think you want to do
chown writeuser:readgroup testdir
don't you?
Or it is much simpler if it can be world readable:
chmod a-w+rx,g+rwx,u+rwx testdir
And I believe selinux implements ACLs, so any distro that support selinux would do that.
Posted at 5:32 p.m. on March 20, 2008
4 Michael B. Trausch says...
Also a bit dated, here is a document on POSIX Access Control Lists on Linux, which is rather informative.
Posted at 5:42 p.m. on March 20, 2008
5 The Mighty Buzzard says...
You'll probably also want to set a proper umask for anyone in the writegroup group if you're dead set on using basic file permissions.
Like the other guys said though, ACLs are really the way to go for this.
Posted at 5:59 p.m. on March 20, 2008
6 Zeth says...
Mish, sadly, the idea was to make the directory not readable to everyone, only to those in the two groups.
Setting it to writeuser:readgroup doesn't help as writeuser was just an example of a possible user in the writegroup.
For the rest of you, thanks for your comments, but I said "How do we achieve this using basic Unix permissions?", I knew about ACLs but they look horrible and I wanted to work out if it is possible with just Unix permissions.
Posted at 3:59 a.m. on March 21, 2008
7 Duncan says...
Have you tried hard-links? You are probably familiar with symlinks aka soft-links. Hard-links have an additional restriction in that they must be on the same filesystem, but the ownership and permissions are assigned to the link, not the data it points to, so it's possible to point multiple hard links each with its own set of permissions at the same on-disk data.
Simplest both for users and to administer is probably to create two directories, say readdir and writedir, setting their group and permissions appropriately. Then create/copy/move the files into writedir, and hard-link (using the ln command, without the -s switch you've likely become used to using) them into readdir as well, again setting the groups and permissions appropriately.
While just that much will suffice if the same set of files are reused over time, if your usage involves dynamic file creation and deletion, keep in mind that both links must be dealt with. (Conceptually, editing an existing file edits the file itself, while creating or deleting one edits the directory entry, that is, the link, for the file. Thus, since each link is separate, editing them is two separate directory edit operations. That's good since it's actually the feature we are using to get the different permissions.) If creating/deleting the files is routine, consider automating the task with a script (or code it directly into the application if that's what you are doing) that manages both links with a single command. Of course, if it's a preexisting binary doing the creation/deletion directly, and you don't have source or modify rights to that binary, that may be easier said than done, but that's what free/libre and open source software is all about. =8^)
See, no ACLs necessary after all!
Duncan
Posted at 1:45 p.m. on March 24, 2008
8 John says...
Duncan, sadly the permissions are stored with the data (inode), not with the directory entries (hard-links). Zeth needs ACLs -- no way to do this with basic unix permissions.
Posted at 7:21 p.m. on July 23, 2008
9 Cam McKenzie says...
OpenSuSe and SLED / SLES support advanced ACL's.
It allows for multiple groups and users all to have different rights
man setfacl and getfacl
Posted at 10:38 p.m. on January 18, 2009