You need to take user input as we did in shell $($any five commands of your choice from Lab $1$

along with a$.$out file that contain any code such as argument display or hello world$)$

and according to the given input,

first you need to create the child process

and then you need to display the command output accordingly.Program would terminate when user enter "Exit".

Incase of invalid input you need to print "invalid argument" and

error in case of exec failure or fork.

For this task you need to use atleast four family function of exec.

$>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>$

p$=$fork$()$;

if$($p$==0)$

$//$child

$//$get user input a for example $($ls$)$

or use case if$($a$==$ls$)$

$//$exec$("$bin$/$ls$","$ls$","/$dir$",$NULL$)$

else

execvp$()$

elseif$($cat$)$

execlp$()$

elseif$()$

$//$parent

wait$($NULL$)$