manipulating flat file

[mynmonic]

I save some data on a flat file, not much data but updates even. I read the book it teachs me only appending new data to a file, or unlink the whole file. In fact I need to somehow delete some elements of and REALLY need to edit them frequently.

So when I access the data in the flat file using array, how can I perform editing of the array elements?

Please help

[WiZARD]

If youre file have a ual info like passwd you may load it like array.... and manage :^)

[mynmonic]

ual info? what's that? any website or document I can read about it? thanks