Which permissions are set on a regular file once the permissions have been modified with the command chmod 654 file.txt?

The chmod command is used to change the permissions of files and directories. The permissions are

represented by three sets of three characters, indicating the permissions for the owner, the group,

and the others. Each character can be either r (read), w (write), x (execute), or - (no permission). The

chmod command can use either symbolic or numeric mode to specify the permissions. In this

question, the numeric mode is used, which consists of three digits from 0 to 7. Each digit is the sum

of the permissions for each set, where r is 4, w is 2, and x is 1. For example, 7 means rwx, 6 means

rw-, and 4 means r–. Therefore, the command chmod 654 file.txt sets the permissions as follows:

The first digit 6 means rw- for the owner, which means the owner can read and write the file, but not

execute it.

The second digit 5 means r-x for the group, which means the group can read and execute the file, but

not write it.

The third digit 4 means r-- for the others, which means the others can only read the file, but not write

or execute it.

The resulting permissions are -rw-r-xr–, which is the correct answer. The other options are incorrect

because they either have the wrong permissions or the wrong file type. A regular file does not have

the d (directory) prefix, and a directory cannot have the - (no file type) prefix. Reference:

Linux Essentials Version 1.6 Objectives: 4.1. Ownership and Permissions1

Linux Essentials Version 1.6 Exam Study Resources: Linux Essentials Manual - Chapter 8. Security and

File Permissions - 8.1. Ownership and Permissions - 8.1.1. The chmod Command2

Linux Essentials Version 1.6 Exam Study Resources: Linux Essentials Manual - Appendix A. Answers to

the Exercises - Chapter 8. Security and File Permissions - 8.1. Ownership and Permissions - Exercise

8.1.12