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You are here: Home » chmod : Details of chmod for an average user

By Abhishek Ghosh April 15, 2012 3:35 pm Updated on April 15, 2012

chmod : Details of chmod for an average user

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chmod is a command line utility under UNIX or UNIX like OS Linux. Although chmod classically requires shell access to change permission, sFTP can be used too. chmod was used first by AT & T on UNIX system since early 1970s. chmod changes the attribute of the file of the owner or the root user.

 

Understanding chmod

 

There are options available for chmod (under shell) ; options can be -v for verbose output and -R for recursively through all the subdirectories. chmod allows a short form for permissions.

There are r , w , x , s and t modes corresponding to the classical symbolic notation. In addition, there is the special character X (capital x), which uses only the file execution law those already have a set right at least one user class.

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Numerical permissions of chmod is mostly used as they are easier to remember. 7    gives full permission where as 4  is read only permission.

 

Practical examples and explanation of chmod

 

Running this command from shell for a file named example.php :

 

$ chmod u = rw, g-rx, o + r example.php

 

sets the permissions of the file example.php of the adds to all others the right to read. Under graphical interface using any sFTP client like WinSCP, simple right click under Windows as remote computer can change the permission of any file on your server :

 

chmod

 

chmod has special importance for cms like WordPress where there are the data is stored on MySQL database and WordPress software acts as the owner. You can see the WordPress Codex for reference of chmod for WordPress. It is not only a good article for WordPress, it is good for understanding chmod itself.

 

It is quite dangerous to set chmod to 777 unless there is special need. By default WordPress sets chmod to 755 ; sometimes shared and advanced Cloud Hosting platforms do not allow to execute a file by WordPress for maintaining safety. Temporary changing the chmod to 777 solves the problem. Never forget to revert it back.

 

Signature Tagged With See chmod --help chmod: Need 2 arguments

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "chmod : Details of chmod for an average user," in The Customize Windows, April 15, 2012, March 27, 2023, https://thecustomizewindows.com/2012/04/chmod-details-of-chmod-for-an-average-user/.

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