log_users.sh

The script should do the following:

Define a variable log whose value is the filename for the log file, users.log .

Append the date to the log file whose name is contained in log.

Append a line of dashes to this log file to act as a separator.

Append a list of the users currently on to users3 to this log file.

Append a blank line to the log file.

The value users.log should be assigned to the variable at the top of the script. Thereafter, never never write "users.log" in your script. Use the value of log instead. Be sure you append the output so the log grows each time you run the script. After running this script twice, the log file users.log should look something like this:

 $ cat users.log Wed Dec 5 10:38:58 EST 2012 ----------------- Login Name Tty Idle Login Time Office Office Phone it244gh Dummy for Glenn Hoffman pts/0 Dec 5 10:29 (dsl092-066-161.bos1.dsl.speakeasy.net) Wed Dec 5 10:39:06 EST 2012 ----------------- Login Name Tty Idle Login Time Office Office Phone it244gh Dummy for Glenn Hoffman pts/0 Dec 5 10:29 (dsl092-066-161.bos1.dsl.speakeasy.net) 

Be sure to test this script several times to make sure it works.

envir.sh

The script should do the following:

Test that it has been given a command line argument. It should print a usage message and exit if no argument is given.

List all global variables that contain the string given in the command line argument.

Do this using a pipe calling env and then grep to filter the output of env for variables which contain the string given as an argument to the script. Thus, if I wanted to see all variables that contained "SSH", I would run

 ./envir.sh SSH