What option instructs ls to output a slash (/) after each directory’s name in output? 2. What command instructs the shell to add execute permission to the p. scri file? 3. For the following, identify command syntax and what each piece of the command line accomplishes: A) $ ls -F / | grep -v/ | column 123456789 1)

Mary's manager told her she should insert a graphic into her documentwrite mary a brief note describing how to insert a graphicin a word processing document.

Two technicians are discussing the common u-joint. technician a says its input and output speeds should be equal. technician b says that it normally has two yokes. which technician is correct?

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?