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### 9.4 Under Linux

- This unit provides access to the L I N U X operating system. It provides most file and I/O handling routines that you may need. It implements most of the standard C library constructs that you will find on a Unix system. If you do a lot of disk/file operations, the use of this unit is recommended over the one you use under Dos.
- Is an implementation of Borlands graph unit, which works on the Linux console. Its implementation is as complete as on the other platforms (it shares the same code). It uses the libvga and libvgagl graphics libraries, so you need these installed for this unit to work. Also, programs using this library need to be run as root, or setuid root, and hence are a potential security risk.
- This implements the various port[] constructs. These are provided for compatibility only, and it is not recommended to use them extensively. Programs using this construct must be run as ruit or setuid root, and are a serious security risk on your system.

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