CSC220 Lab 1 2010

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You can work in pairs on this lab if you wish. Otherwise work individually.

Login

• Login to a Linux box around you using your CSC220a account.

Question Group 1

• What is the path of your account? In other words, what subdirectories does one have to traverse to reach your account.
• What other subdirectories are at the same height as yours in the directory tree?
• You will notice that all user accounts are in a major directory called Users. The old standard for users on a linux system is to have the users in a directory called home in the root directory.
• You will notice that some user accounts still exist in home. Which are they?

Question Group 2

• With Linux, the name of the printers supported are listed in a file called /etc/printcap. Look at its contents.
• Figure out a way to get only the entries from this file that represent printers that are in Ford Hall.

Question Group 3

• Open a browser window and load up the following URL: http://maven.smith.edu/~hadoop/log.txt
• Notice that it is a long log of the output of a research program I have been running recently. It is very long and contains a lot of information: some useful, some not.
• You are going to get a copy of this file into your account. Instead of copying and pasting the text into a file, you are going to use a useful utility called wget. Wget is a Linux utility that allows you to grab Web pages from Web sites, without using a browser.

Try it:

 wget http://maven.smith.edu/~hadoop/log.txt

• Check that the file is in your directory

• The first question is to list only the lines that list the real execution time. These lines look like this:

real	23m6.777s

• Go ahead, list the real execution times. What is the shortest time recorded? The longest?
• List not only the real execution times, but also the lines of the form:

processing noTasks = 17240  maxNoTasks = 8,  splitSize = 33554432L