The Password File
As far as UNIX is concerned, you "are" your entry in the password file that is usually stored as "/etc/passwd". Some security conscious sysadmins hide the file elsewhere, but there is a good chance that you can find the "passwd" file on your system if you do "cd /etc" then issue and "ls" command.
The password file contains single line entries for each user of the system. Each line contains 7 fields delimited by a colon ":" character that define you in a security sense. A sample line is shown below:
The fields correspond to the following index:
Besides the password file, you are also defined by your entry in the group file that we will look at now.