Questions

1. Give a "long" listing of the largest 5 files in the /etc directory whose name contains the string ".conf", sorted by decreasing file size.
2. All the commands listed above are actually programs of the UNIX system. Where on the unix system are these programs located? How will you find out the full path names of these programs?
3. Find the number of lines in which the string "is" occurs in your file FirstWeek.txt.
4. Find the number of lines in which the string " is " occurs in your file FirstWeek.txt.
5. Can you account for the differences in these two numbers?
6. Find the number of lines in which the string "is" does not occur in your file FirstWeek.txt.
7. Create a signature file called .signature giving details of your name, address, hostel and phone numbers and email addresses.
8. Find out how this .signature file is used to save you the trouble of separately signing every mail that you send. Set it up in your favourite mailer.

• (2+3)*100-8
• (2.0+3.0)*100.0-8.0

Question: Do you see any difference between these expressions?

Question: What about the following?

• (2+3)*100-8 div 6
• (2+3)*100-8 mod 6
• (2.0+3.0)*100.0 - 8.0/6.0

Question: Do you understand why you get different answers in each case?

Question: But can you figure out what the following functions are?

• compare
• toString
• fromString
• ~

Question: Can you figure out when the two functions div and quot will give different answers?

Question: Simlarly what is the difference between rem and mod?

Question: Try to give one or more identities that connect the functions div, quot, rem and mod?

Question: How will you convert integers into reals when you have to?

Question: How will you convert reals into integers when you have to?