What command would you use to change the permissions of a file?

The command used to change the permissions of a file is chmod. This command allows users to modify the read, write, and execute permissions for the file owner, group, and others. It can be used in symbolic mode, where permissions are represented by letters (r for read, w for write, and x for execute), or in numeric mode, using numbers to set permissions.

For example:

• To give the owner read and write permissions, but no permissions for the group and others, you might use chmod 600 filename.

• Alternatively, to add execute permission for the owner, you could use chmod u+x filename, where u refers to the user (file owner).

The other commands listed serve different purposes and do not modify file permissions:

• chown is used to change the owner of a file.

• chgrp changes the group ownership of the file.

• modfile is not a standard Linux command for any file operations.

Understanding the specific roles of these commands is essential in managing file permissions and ownership effectively in a Linux environment.