Permission Trio Bits
Figure 10-1 shows the 10 positions (1 type bit and 3 trios of permission bits) that make up the permissions section of a file.
The first bit of the 10 shown is the type of object:
.—Indicates that this is a normal file
l—Indicates that this is a symlink (symbolic link), which is a file that points to another object
b—Indicates that this is a block device file
c—Indicates that this is a character ...