Notes.

• If you are not familiar with the Linux operating system, you should do the lab 1 before doing this homework. You'll also need to complete Lab 2 and submit the resulting file lab2.txt.
• This homework does not require a graphical Linux environment and can be done entirely from an ssh/telnet window (Putty or simple terminal - see Lab 1).
• Commands to be used in this homework: ls, cd, mkdir, man, pico, alpine, find.
  

• List all the files in your home directory and display all the information like size, date when it was modified, owner, and permissions.
• List all the files in the folder /usr/bin/ that start with the letters "ma". Do not display the details for them.
• Locate a file named "math.h" in the file tree starting from the directory /usr/.
• Display the first two pages of the manual entry for the command less (you may have to copy these to the text file right away since they will disapear once you exit the man page).
• Change your working directory to the c151 directory created in lab1. Create a directory calls hw1. Go back to your home directory.
• Using pico, create a file named ".signature". The "." in the file name is important and the file name should look exactly like that! Include your name in the signature and anything else you want. Save this file and exit pico. This file will now be used by pine as your signature when you send an email.
• List the files in the directory containing descriptions of all the devices that can be mounted in the filesystem.
• Change your current working directory to /usr/include. Find all the files named cmath in this directory, using the command find with the -name option. There should be 3 of them.
• Use the command diff to find out how similar these files are. It's a simple command taking two arguments which are the files to compare. You can find an explanation of this command using the man command or in the Demo 2 video clip.
• Assuming that you are still in the folder /usr/include, suppose that you are looking for a header file containing the prototype for a function called "pthread_join". Find the header file that you need to include in your hypothetical program.
  Hint: use the command grep shown in Demo 1.
• Read from the textbook (or look them up on the web) about the utilities sort, date, echo, and file. Give an example of using each of them. For the command sort, create a small text file containing several lines and use it to illustrate how the command works.