Which column contains all details of the permissions of a file when you issue the ls -l command? A. second B. fourth C. third D. first E. None of the above

The correct answer is: C. third

The third column of the output of the ls -l command contains all details of the permissions of a file. The permissions are represented by a string of nine characters, which can be divided into three groups of three characters each. The first group indicates the permissions for the owner of the file, the second group indicates the permissions for the group that the file belongs to, and the third group indicates the permissions for all other users.

The characters in each group have the following meanings:

• r: Read permission
• w: Write permission
• x: Execute permission
• -: No permission

For example, the following output shows that the file foo.txt is owned by the user bar, is readable and writable by the owner and group, and is not executable by anyone:

-rw-r--r-- 1 bar bar 0 Jan 1 00:00 foo.txt

The ls command is a powerful tool that can be used to list the files in a directory and display detailed information about them. The -l option tells ls to list the files in long format, which includes the permissions of each file.