The chmod Command
Chmod also provides a few command line options to simplify administrative tasks. For changing file permissions in directory trees use -R.
$ chmod -R g-w test_dir
This would remove write permission for group for all of the files in and below test_dir.
In order to control the output of messages from chmod use -c, -v and -f:
$ chmod -v 700 test_file mode of test_file changed to 0700 (rwx------)
This option caused chmod to display how the permissions of test_file were set. The -c option causes chmod to display messages only when files are changed, and the -f option suppresses messages about files that can't be changed.
Chmod also provides a --version option to display the version and --help to see a short help message.
File permissions are an integral part of Linux. The same concepts also apply to other operating system objects such as semaphores, shared memory, and NIS+. This tutorial provides you with some of the basic knowledge necessary to protect your data and have more fun with your Linux system, and provides you with mental building blocks for learning more about Linux.
Eric Goebelbecker (firstname.lastname@example.org) is a systems analyst for Reuters America, Inc. He supports clients (mostly financial institutions) who use market data retrieval and manipulation APIs in trading rooms and back office operations. In his spare time (about 15 minutes a week...), he reads about philosophy and hacks around with Linux.
Webinar: 8 Signs You’re Beyond Cron
On Demand NOW
Join Linux Journal and Pat Cameron, Director of Automation Technology at HelpSystems, as they discuss the eight primary advantages of moving beyond cron job scheduling. In this webinar, you’ll learn about integrating cron with an enterprise scheduler.View Now!
|Dr Hjkl on the Command Line||May 21, 2015|
|Initializing and Managing Services in Linux: Past, Present and Future||May 20, 2015|
|Goodbye, Pi. Hello, C.H.I.P.||May 18, 2015|
|Enter to Win Archive DVD + Free Backup Solution||May 18, 2015|
|Using Hiera with Puppet||May 14, 2015|
|Urgent Kernel Patch for Ubuntu||May 12, 2015|
- Initializing and Managing Services in Linux: Past, Present and Future
- Dr Hjkl on the Command Line
- Goodbye, Pi. Hello, C.H.I.P.
- Using Hiera with Puppet
- Gartner Dubs DivvyCloud Cool Cloud Management Vendor
- Mumblehard--Let's End Its Five-Year Reign
- Enter to Win Archive DVD + Free Backup Solution
- Infinite BusyBox with systemd
- It's Easier to Ask Forgiveness...
- Urgent Kernel Patch for Ubuntu