[pvrusb2] change-channel.sh - Adds show current channel, increment, decrement

[roger]

Note:  I'm offline & didn't download the latest & greatest - so as to
why I didn't just submit a patch/diff.  This should be good enough for
those on the list whom want to "kick the tires" with these added
features.

I'll submit a more official looking patch hopefully within the next week
or so when I get time -- or, Mike, if this looks good enough...

Granted, it's not like Mike's favorite TV viewer app, but it's close
when using mplayer /dev/v4l/video0!  Besides, as I've added in the
header of the script, mplayer tv:// seems to be on the horizon and it's
probably only a short time until somebody completes coding "change
channel via sysfs".  (Just tried it and mplayer seems not to function
for the mpeg2/pvrusb2 devices yet.)

The added features within the attached change-channel.sh:
1) Show current channel
2) Increment or decrement current channel

Modifications:
1) I've also provided more detailed when -h is used.
2) Some other minor syntax corrections were made while trying to
preserve original code & syntax.  (Unless somebody knows of a good
sh/bash style checker???)

BTW: Got a response from the original author and he says the suggested
added features (posted in my last email to this list) are ok with him.
(Even changing to #!/bin/bash, but I haven't done this as I don't think
it's needed.)

--
Roger
http://www.eskimo.com/~roger/index.html
Key fingerprint = 8977 A252 2623 F567 70CD 1261 640F C963 1005 1D61

Tue Nov 6 13:04:38 AKST 2007
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