Current Working Directory¶

Current Working Directory: `pwd`¶

Explaining the world:

Every process has a current working directory
⟶ CWD is a process attribute (see Processes, Scheduling, Address Spaces for more about process attributes)
Shell is just an ordinary program ⟶ process
A shell’s process ID¶
```
$ echo $$
121751
```
⟶ shell has a CWD
Command: pwd (“print working directory”)
```
$ pwd
/home/jfasch
```

Changing The Current Working Directory: `cd`¶

Moving from where we are to there

$ pwd
/home/jfasch
$ cd /etc/
$ pwd
/etc

Moving into my home directory
```
$ pwd
/etc
$ cd
$ pwd
/home/jfasch
```
Same, but with more typing
```
$ cd ~
```

Moving into someone else’s home directory

$ cd ~someone-else
$ pwd
/home/someone-else

Moving back where I been last (where I came from): cd -

$ cd ~someone-else
$ pwd
/home/someone-else
$ cd -      # <-- back where I came from
$ pwd
/etc

Moving into parent directory
```
$ cd ..
```
No-op nonsense
```
$ cd .
```