How to use the common command readonly in Linux

This article is to share with you about how to use the common command readonly in Linux. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Linux common commands readonly commands are mainly used to define one or more variables and set read-only attributes, set read-only properties for one or more defined variables, display all variables that contain read-only attributes, set read-only properties for one or more functions that have been defined, and display all functions that contain read-only attributes.

Syntax format readonly [parameters]

Common parameters:-a points to array-A points to associative array-p shows all read-only variables-f points to function reference instance to display all read-only variables:

[root@linux265 ~] # readonly displays all arrays with read-only attributes:

[root@linux265 ~] # readonly-a displays all associative arrays with read-only attributes:

[root@linux265 ~] # readonly-A shows all functions with read-only attributes:

[root@linux265 ~] # readonly-f has an invalid option after it:

[root@linux265] # readonly-Thank you for reading! This is the end of the article on "how to use readonly in Linux". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!