Just Recompiled for OS4.

Original readme:

Flush
~~~~~
This program flushes unused libraries,devices and fonts from RAM. 
Options include reporting on which did and didn't get flushed, selection
of either devices/libraries/fonts, report mode only, and announcing
amount of memory regained. It runs from the CLI and under AmigaDOS 2.04+.

Objects deemed flushable are those with a zero-user count. Note that
not every Object will flush itself (eg diskfont.library).

This is Version 1.5 and is freeware. C-source included; compiles
under SAS/C 6.3

Usage
~~~~~

Flush: flushes unused libraries, devices, fonts from RAM
Version 1.5  [Oct 17 1995] written by gduncan()werple.net.au

usage: flush [-a] [-d] [-f] [-l] [-q] [-h] [-oOBJ]
 -a    ; flush devices/fonts/libraries
 -d    ; only flush devices
 -f    ; only flush fonts
 -l    ; only flush libraries
 -q    ; quiet mode; don't print names of all removed objects
 -oOBJ ; remove OBJ , must have a suffix of .library or .device
 -h    ; this message

 ...else just report fkushable objects.

Installation
~~~~~~~~~~~~
Put it anywhere in your path.

Disclaimer
~~~~~~~~~~

Use it at your own risk :) I do 

Author
~~~~~~

 Gary Duncan
 57 Melbourne Hill Rd
 Warrandyte
 Vic 3113
  Australia

E-mail :-  gduncan()werple.net.au

Acknowledgements
~~~~~~~~~~~~~~~~

Thanks to these beta-testers for testing early versions:-

 Benbuck Nason (bigben()netcom.com)
 Torsten Nielsen (torsten()diku.dk)
 Darren Reid and others (shockwave()jupiter.sun.csd.unb.ca)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 8084   19392  41.7% -lh5- 9091 Feb 16 10:31 flush/flush
[generic]                 4444   15918  27.9% -lh5- ab83 Feb 16 10:31 flush/flush.c
[generic]                  317     622  51.0% -lh5- 6927 Jan 31 12:59 flush/flush.h
[generic]                 6004   15308  39.2% -lh5- da51 Feb 16 10:31 flush/flush.o
[generic]                  348     937  37.1% -lh5- 78ce Feb 16 10:19 flush/flush_protos.h
[generic]                  110     187  58.8% -lh5- e710 Feb 16 10:25 flush/flush_rev.h
[generic]                  175     250  70.0% -lh5- 8aee Feb 16 10:26 flush/Makefile
[generic]                  806    1459  55.2% -lh5- fdc5 Jan 16 01:31 flush/README
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         8 files   20288   54073  37.5%            Feb 17 00:16