Changing to another directory (cd command)

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Use the cd command to move from your present directory to another directory. You must have execute (search) permission in the specified directory.

If you do not specify a Directory parameter, the cd command moves you to your login directory ($HOME in the ksh and bsh environments, or $home in the csh environment). If the specified directory name is a full path name, it becomes the current directory. A full path name begins with a slash (/) indicating the /(root) directory, a dot (.) indicating current directory, or a dot dot (..) indicating parent directory. If the directory name is not a full path name, the cd command searches for it relative to one of the paths specified by the $CDPATH shell variable (or $cdpath csh variable). This variable has the same syntax as, and similar semantics to, the $PATH shell variable (or $path csh variable).

The following are examples of how to use the cd command:

To change to your home directory, type the following:
```
cd
```
To change to the /usr/include directory, type the following:
```
cd /usr/include
```
To go down one level of the directory tree to the sys directory, type the following:
```
cd sys
```
If the current directory is /usr/include and it contains a subdirectory named sys, then /usr/include/sys becomes the current directory.
To go up one level of the directory tree, type the following:
```
cd ..
```
The special file name, dot dot (..), refers to the directory immediately above the current directory, its parent directory.