Summary
Now that you have completed this chapter, you should have a firm understanding of the following:

There are a number of useful command line utilities available for processing files and discovering information about users on a UNIX system. The find command can be used to find files and folders on your local computer or on a remote computer such as a server. Files can also be located by searching for specific strings in their contents. The grep command can do this and can search for strings of characters in the output of other commands such as ls and ps when used with the pipe (|). The CDE File Manager File menu has a Find option that can perform some of the capabilities of the find command and the grep command using a graphical user interface.

The contents of files and the output of commands can be sequenced using the sort command. The sort command has a number of options including what field to start sorting, numeric or alpha sort, and reverse sorts.

There are several commands available to discover information about logged in user accounts. The who command can display all the users currently logged on to a particular machine. The who am i and the whoami commands will display your Real User ID (RUID) and the id command will display your Effective User ID (EUID) if you have switched to another user's account. The id command can also be used to see what groups a user is a member of. The su (switch user) command allows you to temporarily assume another user's account for access to their files or for testing and troubleshooting purposes.