You have two files in exercise folder.

a$.$ programmer

b$.$ project

c$.$ Cut the programmer$\_$number fields from the project file $($field $4)$ and piping the output to the sort

command to place any duplicate numbers together. Pipe the sorted output to the uniq command

to remove any duplicate programmer$\_$numbers. Finally, redirect the output to a temporary file t$1.$

$($The t$1$ file is a list of programmer numbers that identifies pogrammers who are assigned to

projects.$)$

d$.$ The next step is to cut the programmer$\_$number field $($field $1)$ from the programmer file, and pipe

the output as you did in Step c$.$ Call the new temporary file t$2,$ which is a list of programmer

numbers that identifies all of the programmers.

e$.$ Now that t$1$ and t$2$ are sorted in the same order, you can match them. Use the comm command to

select the lines from t$1$ that do not match lines in t$2,$ and redirect the output to another file t$3,$

which lists programmer numbers of all programmers who are not assigned to projects

f$.$ To display the name of unassigned programmers: $1.$ sort the programmer file in

programmer$\_$number order, and write the output to t$4.2.$ Use the join command to match

programmer$\_$numbers in t$4$ and t$3,$ and redirect the output to t$5.$ What is t$5$ containing