Lab 9

1. Use vi to create a script called s1 that:
   1. sets variable a to 7
   2. print out the contents of variable a
   3. sets variable b to 3
   4. print out the contents of variable b.
   5. add a to b into a variable called c.
   6. print out c.
2. Set execute permission on s1.
3. Run script s1.
4. email me s1

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