Linksys WAP11's have a web interface that you can use to change various settings, like the channel. To do this from the command line:
curl -s -u admin:password -d 'channel=6' http://wap11-0/setup.htm
Replacing 'password' and 'wap11-0' with the values for your WAP11.
Running this command makes the WAP11 run through its reset sequence, so it's useful if a WAP11 crashes.
More notes are here.
James Bowman - acelere.net