Run the following sequence of commands under your shell. What are the outputs of the three pwd commands? Why are the outputs of the last two pwd commands different?
```
$ pwd
$ bash
$ cd /usr
$ pwd
...
$
$ pwd
...
$
```
The outputs of the above commands are shown in the following session. The outputs of the last two pwd commands are different because the first displays the current directory under the sub-shell (which is /usr after the cd /usr has executed). The last pwd command displays the current directory in the parent (original) shell because
```
$ pwd
/home/faculty/sarwar
$ bash
$ cd /usr
$ pwd
/usr
$
$ pwd
/home/faculty/sarwar
$
```
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