Program $1$:

Suppose we have a file called protocols.txt including three columns. The first one cont ains the name of the protocol, the second one contains the input dat a flow and the third one contains the output dat a flow. The file could be shown as follows:

$\backslash$table$[[$tcp$,100,150],[$udp$,250,350],[$ftp$,150,400],[$smtp$,150,500],[$smb$,200,300]]$

The fields are separated by spaces or Tabs.

$($a$)$ The program should display a menu to choose between Input and Output flow

$($b$)$ A test should be carried out whether the choice is $1($for Input data flow$)$ or $2($for output dat a flow$)$

$($c$)$ A loop should verify that the given value is $1$ or $2$

$($d$)$ A command should display the protocol name and the input or output dat a flow with respect to the given choice

$($e$)$ The output of the command should be given in a loop to read line by line

$($f$)$ Test whether the line is empty. In this case the loop should end

$($g$)$ Store the readed value in the positional par ameters

$($h$)$ Display the data flow in form of #####$,$ where each # symbol corresponds to the value $10$

$15.$ Program $2$: Write a program which displays the users and their UID in form of a table. Only those having a UID greater or equal a given positional par ameter should be given.

The program should

$($a$)$ Test whether a position parameter is given

$($b$)$ write the command which display the users and UID separated by a space and enter the output to a while loop

$($c$)$ read the output of the executed command line by line

$($d$)$ put the line in the set of positional parameters $@

$($e$)$ test whether the UID is greather than the desired Value and display them in case of true.