Split and join file on Mac OSX Terminal

Oct 6, 2011 • {"login"=>"zenglekidd", "email"=>"zenglekidd@gmail.com", "display_name"=>"zenglekidd", "first_name"=>"", "last_name"=>""} • {"_edit_last"=>"17781607", "_oembed_dd31df1a1e790c730df70c3d6a1cabd6"=>"{{unknown}}", "_oembed_3434d8cc36f7a6e309369d421ba0c734"=>"{{unknown}}", "_oembed_e798d3465315ed7af7259f09e959e03c"=>"{{unknown}}", "_oembed_a32f75c5cdd4e75fb421e75e2e812a7b"=>"{{unknown}}", "_oembed_c45da31c5e95950678646e4947cbc65b"=>"{{unknown}}", "_oembed_f7b694241d678c8f0811c8686d003997"=>"{{unknown}}", "_oembed_889f78f3f8dbfa74c8d8e8e19a9c361c"=>"{{unknown}}", "_oembed_49c8481180da2ea89b4cfefaef477f7f"=>"{{unknown}}", "_oembed_c08a6e733e548d288615a2516f4ca8bb"=>"{{unknown}}", "_oembed_f16175a267c3dd58752010033aa60363"=>"{{unknown}}", "_oembed_4218fb625bb53c24c6e7c3a974d89814"=>"{{unknown}}", "_oembed_ce468efee7faf29feb2d073a1f67b746"=>"{{unknown}}", "_oembed_5a6f42680b83e5f932db496a4a7a2844"=>"{{unknown}}", "_oembed_b23ff0c544ef980f3c3e3e157eec2952"=>"{{unknown}}", "_oembed_2a112cd02edba04c48427a649c95285b"=>"{{unknown}}", "_oembed_200389b1ab7b1db3a5984732c6b546a5"=>"{{unknown}}", "_oembed_7ff39c748dd25df74cd3b427be76a92f"=>"{{unknown}}", "_oembed_bbed1ac7171ae3a6107cd39191940cfa"=>"{{unknown}}", "_oembed_38b9d7860470601b10347f976da1d289"=>"{{unknown}}", "_oembed_f18cb23ad7b748552f6f6c612ff4f8e4"=>"{{unknown}}", "_oembed_c4eac71eee2e6e636650cb1ee71c1682"=>"{{unknown}}", "_oembed_8801301ce3b384460b55c65eb744ed5c"=>"{{unknown}}", "_oembed_d93081063c819407dcf2e73e49c7f42f"=>"{{unknown}}", "_oembed_7e6f1213ba6c65d7b9a677b94924b155"=>"{{unknown}}", "_oembed_df4757d09551f5c3dae3653aac0ac77f"=>"{{unknown}}"}

I meet a problem, when I want to copy a 4.8G file to a friend.
Why not AirDrop? I really want to use, but his computer is just snow lepoard.(I use Lion)

So I decied to split this file into three 2G file
which means each file is 2000m

[sourcecode language="bash"]
$ split -f 2000m filname newFileName

$ cat newFileNameaa newFileNameab newFileNameac >filename
[/sourcecode]

The problem I meet is when you split a large file, it eat up all your inactive memory?

Now , it solved by Google.
[sourcecode language="bash"]
$ purge
[/sourcecode]