Name:

Period:

25 points total.

1. (1 point) Write an awk script which will display just names and UIDs from /etc/passwd
   

2. (2 points) Alter the above so that only users which are using the Bourne-Again Shell are displayed. Do not use grep.
   

3. (2 points) Write an awk script which will read all lines in the /etc/passwd file, and produce a report which looks like this:

   USER REPORT
   
   USER    UID
   
   root    0
   xfs     87
   apache  38
   
   

4. (3 points) Modify your previous script to include valid XHTML headers (which can be cobbled from last week's lab), and to build a table which holds the above data. Remember, tables have a format like this:

   < table >
       < tr >
          < td > 
          < td >
       < /tr >
   < table >
   

   All table data must appear between the table open and table close tags. tr indicates the beginning of a horizontal row, and td is table data--which is to say, a cell of data.
5. (2 points) Modify the script to include a line which shows the total number of user accounts on the system
6. (2 points) Modify the script to include a line which shows the total number of accounts which use /bin/sh as their shell, and the total number of accounts which use /bin/bash as their shell.
7. (2 points) Modify the script from number 2 to display only accounts which have home directories in /home
   

8. (2 points) Use awk to print out the first field of every line in /etc/passwd which has a UID of 0 or a GID of 0.
   

9. (3 points) Use awk to pull out only the IP addresses from all lines which contain the phrase "Invalid User" in the file at http://ccis2161.linux-classes.com/linux3/sample_files/messages.
   

10. (2 points) Modify the previous script to build an HTML page with an unordered list (<ul>) of all offending IP addresses.
    

11. (2 points) Modify the answer from the previous question to exclude all addresses from the 192.168.1 range
    

12. (2 points) Use awk to build another HTML report, but this time build an unordered list of all the invalid user names which were attempted.
    

1. (3 points)Write an awk command which will sum the UIDS from lines 15-30 of /etc/passwd, and display a running total: