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 (email@example.com) 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.
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|Sharing Admin Privileges for Many Hosts Securely||Jan 28, 2015|
|Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform||Jan 23, 2015|
|Designing with Linux||Jan 22, 2015|
|Wondershaper—QOS in a Pinch||Jan 21, 2015|
- PostgreSQL, the NoSQL Database
- Sharing Admin Privileges for Many Hosts Securely
- HPC Cluster Grant Accepting Applications!
- Designing with Linux
- Wondershaper—QOS in a Pinch
- January 2015 Issue of Linux Journal: Security
- Internet of Things Blows Away CES, and it May Be Hunting for YOU Next
- Ideal Backups with zbackup
- Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform
- Slow System? iotop Is Your Friend
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