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

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1. The first number represents the Owner permission; the second represents the Group permissions; and the last number represents the permissions for all other users. The numbers are a binary representation of the rwx string.

   r = 4
   w = 2
   x = 1

   You add the numbers to get the integer/number representing the permissions you wish to set. You will need to include the binary permissions for each of the three permission groups.

   So to set a file to permissions on file1 to read _rwxr_____, you would enter chmod 740 file1.

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