Hold scan results for a period of time

COFM project.9323603
Wed Nov 24 03:45:35 PST 2004

Thx, i know this command "iwlist wlan0 scan >> scan_tmpfile"
will do redirection from the standard output to file.
But when i do roaming, how can i use these privious data (i.e. 
In other words, how can let the driver refer privious scan result for 
roaming ? 

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