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1992-12-02
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T R I M
Version 3.0
December 1992
(c)1990-1992 Arrow Software
Trim is a simple but remarkably useful utility which will
remove, or 'Trim', all or part of a directory tree. Trim
will delete any specified directory and all the files and
sub-directories contained therein.
Trim is also useful for erasing ALL files and directories
on a floppy disk which is much quicker than either
manually deleting the files or re-formatting the disk.
Although Trim is useful for removing single directories
and their files, a good example of Trims ability would be
the removal of a complex software product such as
Borlands excellent Turbo C++ package. This package - if
installed using the defaults - creates the 15 directories
shown below.
C:\
|---TC
| |---BIN
| |---INCLUDE
| | +---SYS
| |---LIB
| |---BGI
| |---TOUR
| |---CLASSLIB
| | |---EXAMPLES
| | |---INCLUDE
| | |---LIB
| | +---SOURCE
| +---EXAMPLES
| |---STARTUP
| +---TCALC
V
Removing this manually would require some considerable
effort using some THIRTY normal MS-DOS commands since all
the files in each directory would first have to be
deleted before repeated RemDir commands could be used to
remove each directory in turn. Trim however will remove
the entire tree with just one command:- TRIM TC
* Note that Trim ALWAYS prompts for confirmation
* at least once before starting to delete any
* file or directory! Trim is invoked in one of
* three ways.
i) TRIM
This will Trim from the root of the current
directory. For example - if you are in the directory
C:\TP5\ALPHA then Trim will assume that the \TP5
tree is to be removed.
ii) TRIM ZAPPA
Trim will assume that you wish to remove the
directory tree under \ZAPPA
iii) TRIM E:
Trim will assume that you wish to erase ALL files
and directories on drive E:
Note that Trim has no regard for System, Hidden, or Write
protected files. Trim was designed to provide a quick
and efficient way of removing directories and files.
Quick it is! TAKE CARE.
Note also that if you should Trim the directory you are
currently in - the program will move you to the Root
directory of the current disk.
WIPE
----
TRIM accepts one extra command line switch which is /WIPE
and causes Trim to not only erase files, but to overwrite
the space that they occupied. This was added in version
2.2 of Trim as an extra security feature. The files are
over-written with $F6's which is the value used by the Ms
disk formatter. The wipe option was added for use during
a software audit recently carried out so that software
could be 'properly' erased from a disk.
Eg:-
TRIM C:\MYCPROGS /WIPE
The wipe option not only over-writes files before erasing
them, it also renames the file to a string of E5h's as
used by Dos when deleting a file. Therefore it is impossible
to tell what the file which has been wiped was originally
called. This is also true for directories.
INSTALLING TRIM
---------------------------------------------------------
This couldn't be easier. simply copy the TRIM.EXE file to
any directory listed in your PATH statment.
SHAREWARE
---------------------------------------------------------
This utility is offered to you under the shareware principle.
If you like it, then be a decent member of the computing
community and send 15 UK Pounds to Arrow Software. In return,
you'll receive the next copy of Trim for free. (See below)
LIABILITY
---------------------------------------------------------
Whilst great care has been taken to ensure that this program
functions as described, Arrow Software will not be held
responsible for any damages arising from the direct or indirect
use of this program.
TRIM version 4
---------------------------------------------------------
Work is currently under way on Trim version 4 which gives
the ability to only trim a part of a directory tree. Using
the directory structure shown above, Trim 4 would allow you
for example to Trim just the CLASSLIB directory and those
below it. Register Trim 3 and you will automatically receive
a registered version of Trim 4.
Comments, suggestions etc are welcomed either to the address
below or via e-mail to roysan@uxb.liverpool.ac.uk
TRIM is copyright (c)1990-92 Arrow Software
Arrow Software
25 Cleveley Road
Calderstones
Liverpool
L18 9UN
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