Write a c shell program to incoorperate the commands cd$,$ exit, ls$,$ and path. For ls and path, do not hard code paths. Paths should be found from a search for paths. Also use execv instead of execvp. The following should be able to be taken as an input and produce the following output.

input:

cd tests$/$p$2$a$-$test

output:

test$1$

test$2$

test$3$

test$4$

input:

ls $/$no$/$such$/$file

exit

output:

ls: $/$no$/$such$/$file: No such file or directory

input:

path tests

p$1.$sh

path

p$1.$sh

ls exit

output:

An error has occurred

An error has occurred