CST8204: Lab Exercise 7
Regular expressions

Use regular expressions on a copy of the password file (use ypcat) to answer the following:

1. Write the fifth field of your own record using ^your_user_id:

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2. Find my record, using my last name "Allison"; experiment with its case if it's not found, and write field 5 below; as a last resort, use ^allisor:

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3. Now list all the entries that have both an empty name field and no shell

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4. How many students have the family name "Li"? And how many student family names start with the letters "Li"?

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5. How many students have a family name that ends with "son"? And how many faculty family names?

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6. What is the exact number of student accounts right now? What command did you use to find out?

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7. Who or what is the numeric user id 502 used for? How did you find it?

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