1ALEVT-DATE(1) Teletext time ALEVT-DATE(1)
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6 alevt-date - display/set time received via Teletext
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10 alevt-date [options]
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14 alevt-date displays the time received from a Teletext source. It can
15 be used to set the system time. The date is not interpreted (not even
16 transmitted on most channels). So it allows only adjustment of +/-12
17 hours. The default allowed adjustment is limited to +/-2 hours (use
18 -delta to change). Without the -set option it just displays the date
19 in the format of the date(1) command.
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23 A summary of options is included below.
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25 -set Set system time from time received via Teletext.
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27 -delta seconds Maximum allowed adjustment made to the system time.
28 The default is 7200 seconds (2 hours) and the maximum
29 that may be given is 12 hours.
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31 -format string Format string to used to print the time. Look at
32 strftime(3) for possible control sequences.
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34 -vbi device Use the given device name (default: /dev/vbi0).
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36 -timeout seconds If the time can't be detected in seconds, the program
37 is terminated with a SIGALRM.
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39 --help Show summary of options.
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41 --version Show version of program.
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43 Before starting this program, you have to set the TV channel with
44 another program like xawtv of set-tv.
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46 Note: This program does not set the battery backed up clock of your
47 computer. clock -w will do this.
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51 /dev/vbi*
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55 alevt(1x), alevt-cap(1), strftime(3), date(1), clock(8).
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59 This program is just a toy. The time transmitted by the TV stations is
60 more than inaccurate. Some are within a few seconds of your local time
61 reference but others are more then 15 minutes off. You've been warned.
62 (And don't assume the pkt8/30 time is better. It's even worse.)
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64 No bug reports to <froese@gmx.de> *g*.
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68LINUX 1.6.2 ALEVT-DATE(1)