How to purge memory in OSX 10.4.11?

Dear Reader,
I'm in possesion of a 2005 mac mini G4. (Yes, it's one from the great PPC era).
And long story short, I use this machine as server. To monitor I use the terminal on my Macbook pro.
And i want to be able to PURGE the memory, like I can with other mac's in my household.
To monitor this G4 i use the following procedure:
In terminal on my MBP:
ssh -22 admin@ipaddress
I then get prompted for my password
Then I can use commands like: top, netstat, ps aus, kill etc. etc. to view my macmini's current occupations.
However the command: PURGE does not seem to work.
It seems to me, that the purge command was added after OSX 10.4.11. Tiger is the OS which i'm currently using.
On 10.7 and 10.8 macs this command is great. When your machine's memory gets clogged you can easily purge it with this command.
Is there a way to perform such an action in OSX 10.4.11? And if so, how do I do it.
Many Thanks for your help in advance.
Also please excuse me for english is not my native language.
Kind Regards
Peter
Post scriptum:
I use Owncloud, Joomla, MAMP, Vuze and some other software on my macmini. So if there are any querrys about my setup feel free to contact me!

Hello,
purge was available in 10.4, but only if you installed Developer tools, it itself is only 29,696 bytes.
The man file...
.Dd September 20, 2005
.Dt PURGE 8
.Sh NAME
.Nm purge
.Nd force disk cache to be purged (flushed and emptied)
.Sh SYNOPSIS
.Nm purge
.Sh DESCRIPTION
.Nm Purge
can be used to approximate initial boot conditions with a cold disk buffer cache
for performance analysis. It does not affect anonymous memory that has been allocated
through malloc, vm_allocate, etc.
.Pp
.Sh SEE ALSO
.Xr sync 8 ,
.Xr malloc 3
Or, a free Purge App...
http://frisbeesoftware.weebly.com/applications.html

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