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